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Groups > linux.kernel > #1417162 > unrolled thread
| Started by | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| First post | 2016-06-08 11:30 +0200 |
| Last post | 2016-06-08 13:20 +0200 |
| Articles | 20 on this page of 33 — 3 participants |
Back to article view | Back to linux.kernel
[PATCH perf/core v10 00/23] perf-probe --cache and SDT support Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 11:30 +0200
[PATCH perf/core v10 02/23] perf-probe: Fix to add NULL check for strndup Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 11:30 +0200
[PATCH perf/core v10 05/23] perf probe: Recover and export synthesize_perf_probe_point() Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 11:40 +0200
[PATCH perf/core v10 14/23] perf probe: Accept %sdt and %cached event name Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 11:40 +0200
[PATCH perf/core v10 18/23] perf probe: Allow wildcard for cached events Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 11:40 +0200
[PATCH perf/core v10 22/23] perf build: Add sdt feature detection Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 11:40 +0200
[PATCH perf/core v10 15/23] perf-list: Show SDT and pre-cached events Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 11:40 +0200
[PATCH perf/core v10 10/23] perf probe: Remove caches when --cache is given Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 11:40 +0200
Re: [PATCH perf/core v10 10/23] perf probe: Remove caches when --cache is given Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-06-09 16:30 +0200
Re: [PATCH perf/core v10 10/23] perf probe: Remove caches when --cache is given Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-11 03:20 +0200
[PATCH perf/core v10 09/23] perf probe: Show all cached probes Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 11:40 +0200
Re: [PATCH perf/core v10 09/23] perf probe: Show all cached probes Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-06-09 16:30 +0200
Re: [PATCH perf/core v10 09/23] perf probe: Show all cached probes Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-11 02:30 +0200
[PATCH perf/core v10 08/23] perf probe: Use cache entry if possible Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 11:40 +0200
[PATCH perf/core v10 12/23] perf probe: Add group name support Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 11:40 +0200
[PATCH perf/core v10 11/23] perf/sdt: ELF support for SDT Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 11:40 +0200
[PATCH perf/core v10 04/23] perf probe: Add perf_probe_event__copy() Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 11:40 +0200
[PATCH perf/core v10 21/23] perf probe: Support a special SDT probe format Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 11:40 +0200
[PATCH perf/core v10 16/23] perf-list: Skip SDTs placed in invalid binaries Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 11:40 +0200
[PATCH perf/core v10 13/23] perf buildid-cache: Scan and import user SDT events to probe cache Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 11:40 +0200
[PATCH perf/core v10 17/23] perf: probe-cache: Add for_each_probe_cache_entry() wrapper Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 11:40 +0200
[PATCH perf/core v10 23/23] perf-test: Add a test case for SDT event Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 11:40 +0200
[PATCH perf/core v10 19/23] perf probe: Search SDT/cached event from all probe caches Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 11:40 +0200
[PATCH perf/core v10 20/23] perf probe: Support @BUILDID or @FILE suffix for SDT events Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 11:40 +0200
[PATCH perf/core v10 07/23] perf probe: Add --cache option to cache the probe definitions Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 11:40 +0200
Re: [PATCH perf/core v10 07/23] perf probe: Add --cache option to cache the probe definitions Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-06-09 16:20 +0200
Re: [PATCH perf/core v10 07/23] perf probe: Add --cache option to cache the probe definitions Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-11 01:40 +0200
[PATCH perf/core v10 06/23] perf probe-file: Introduce perf_cache interfaces Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 11:40 +0200
Re: [PATCH perf/core v10 06/23] perf probe-file: Introduce perf_cache interfaces Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-06-09 16:20 +0200
Re: [PATCH perf/core v10 06/23] perf probe-file: Introduce perf_cache interfaces Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-11 00:20 +0200
[PATCH perf/core v10 23/23] perf-test: Add a test case for SDT event Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 13:20 +0200
Re: [PATCH perf/core v10 00/23] perf-probe --cache and SDT support Masami Hiramatsu <masami.hiramatsu@gmail.com> - 2016-06-08 13:20 +0200
[PATCH perf/core v10 22/23] perf build: Add sdt feature detection Masami Hiramatsu <mhiramat@kernel.org> - 2016-06-08 13:20 +0200
Page 1 of 2 [1] 2 Next page →
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-06-08 11:30 +0200 |
| Subject | [PATCH perf/core v10 00/23] perf-probe --cache and SDT support |
| Message-ID | <rHHYe-6M4-17@gated-at.bofh.it> |
Hi,
Here is the 10th version of the patchset for probe-cache and
initial SDT support.
This version fixes a bug and split big patches into small subsets
according to Namhyung's comment.
Also I've added a testcase for SDT. In this version, the number of
patches are increased, but basically, only 3 patches (bugfix, and
adding test) are new.
Changes in v10:
- [1/23] Fix a bug in rm_rf().
- [2/23,] Separate a big patch into 3 sub patches.
- [3/23 - 7/23] separate a big patch into 5 sub patches.
- [13/23, 14/23] Update documents for SDT explanations.
- [22/23, 23/23] Add a test case for SDT and update build config
to detect sys/sdt.h.
Thank you,
---
Hemant Kumar (1):
perf/sdt: ELF support for SDT
Masami Hiramatsu (22):
perf: util: Fix rm_rf() to handle non-regular files correctly
perf-probe: Fix to add NULL check for strndup
perf-buildid: Rename and export build_id_cache__cachedir()
perf probe: Add perf_probe_event__copy()
perf probe: Recover and export synthesize_perf_probe_point()
perf probe-file: Introduce perf_cache interfaces
perf probe: Add --cache option to cache the probe definitions
perf probe: Use cache entry if possible
perf probe: Show all cached probes
perf probe: Remove caches when --cache is given
perf probe: Add group name support
perf buildid-cache: Scan and import user SDT events to probe cache
perf probe: Accept %sdt and %cached event name
perf-list: Show SDT and pre-cached events
perf-list: Skip SDTs placed in invalid binaries
perf: probe-cache: Add for_each_probe_cache_entry() wrapper
perf probe: Allow wildcard for cached events
perf probe: Search SDT/cached event from all probe caches
perf probe: Support @BUILDID or @FILE suffix for SDT events
perf probe: Support a special SDT probe format
perf build: Add sdt feature detection
perf-test: Add a test case for SDT event
tools/perf/Documentation/perf-buildid-cache.txt | 3
tools/perf/Documentation/perf-probe.txt | 32 +
tools/perf/Makefile.perf | 3
tools/perf/builtin-list.c | 6
tools/perf/builtin-probe.c | 30 +
tools/perf/config/Makefile | 10
tools/perf/tests/Build | 1
tools/perf/tests/builtin-test.c | 4
tools/perf/tests/make | 3
tools/perf/tests/sdt.c | 114 +++++
tools/perf/tests/tests.h | 1
tools/perf/util/build-id.c | 196 ++++++++-
tools/perf/util/build-id.h | 6
tools/perf/util/parse-events.c | 83 ++++
tools/perf/util/parse-events.h | 2
tools/perf/util/probe-event.c | 490 ++++++++++++++++++++--
tools/perf/util/probe-event.h | 6
tools/perf/util/probe-file.c | 504 +++++++++++++++++++++++
tools/perf/util/probe-file.h | 41 ++
tools/perf/util/symbol-elf.c | 252 ++++++++++++
tools/perf/util/symbol.h | 22 +
tools/perf/util/util.c | 13 -
22 files changed, 1736 insertions(+), 86 deletions(-)
create mode 100644 tools/perf/tests/sdt.c
--
Masami Hiramatsu
[toc] | [next] | [standalone]
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-06-08 11:30 +0200 |
| Subject | [PATCH perf/core v10 02/23] perf-probe: Fix to add NULL check for strndup |
| Message-ID | <rHHYe-6M4-39@gated-at.bofh.it> |
| In reply to | #1417162 |
Fix to add a NULL check for strndup when parsing
probe trace command.
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
Changes in v10:
- Splited from "perf probe: Allow wildcard for cached events"
---
tools/perf/util/probe-event.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 74401a2..7ae3dd1 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1603,6 +1603,10 @@ int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
p = strchr(argv[1], ':');
if (p) {
tp->module = strndup(argv[1], p - argv[1]);
+ if (!tp->module) {
+ ret = -ENOMEM;
+ goto out;
+ }
p++;
} else
p = argv[1];
[toc] | [prev] | [next] | [standalone]
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-06-08 11:40 +0200 |
| Subject | [PATCH perf/core v10 05/23] perf probe: Recover and export synthesize_perf_probe_point() |
| Message-ID | <rHI7T-6Pu-7@gated-at.bofh.it> |
| In reply to | #1417162 |
Recover and export synthesize_perf_probe_point() which had
once introduced but disabled long time. This renew the
code and re-enable it.
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
Changes in v10:
- Splited from "Add --cache option to cache the probe definitions"
---
tools/perf/util/probe-event.c | 39 ++++++++++++++++++++++-----------------
tools/perf/util/probe-event.h | 1 +
2 files changed, 23 insertions(+), 17 deletions(-)
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 84f4b2b3..cbc8a8b 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -67,7 +67,6 @@ int e_snprintf(char *str, size_t size, const char *format, ...)
return ret;
}
-static char *synthesize_perf_probe_point(struct perf_probe_point *pp);
static struct machine *host_machine;
/* Initialize symbol maps and path of vmlinux/modules */
@@ -1716,7 +1715,7 @@ out:
}
/* Compose only probe point (not argument) */
-static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
+char *synthesize_perf_probe_point(struct perf_probe_point *pp)
{
struct strbuf buf;
char *tmp, *ret = NULL;
@@ -1755,30 +1754,36 @@ out:
return ret;
}
-#if 0
char *synthesize_perf_probe_command(struct perf_probe_event *pev)
{
- char *buf;
- int i, len, ret;
+ struct strbuf buf;
+ char *tmp, *ret = NULL;
+ int i;
- buf = synthesize_perf_probe_point(&pev->point);
- if (!buf)
+ if (strbuf_init(&buf, 64))
return NULL;
+ if (pev->event)
+ if (strbuf_addf(&buf, "%s:%s=", pev->group ?: PERFPROBE_GROUP,
+ pev->event) < 0)
+ goto out;
+
+ tmp = synthesize_perf_probe_point(&pev->point);
+ if (!tmp || strbuf_addstr(&buf, tmp) < 0)
+ goto out;
+ free(tmp);
- len = strlen(buf);
for (i = 0; i < pev->nargs; i++) {
- ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s",
- pev->args[i].name);
- if (ret <= 0) {
- free(buf);
- return NULL;
- }
- len += ret;
+ tmp = synthesize_perf_probe_arg(pev->args + i);
+ if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0)
+ goto out;
+ free(tmp);
}
- return buf;
+ ret = strbuf_detach(&buf, NULL);
+out:
+ strbuf_release(&buf);
+ return ret;
}
-#endif
static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
struct strbuf *buf, int depth)
diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
index 367f886..0b024ba 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -121,6 +121,7 @@ int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev);
char *synthesize_perf_probe_command(struct perf_probe_event *pev);
char *synthesize_probe_trace_command(struct probe_trace_event *tev);
char *synthesize_perf_probe_arg(struct perf_probe_arg *pa);
+char *synthesize_perf_probe_point(struct perf_probe_point *pp);
int perf_probe_event__copy(struct perf_probe_event *dst,
struct perf_probe_event *src);
[toc] | [prev] | [next] | [standalone]
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-06-08 11:40 +0200 |
| Subject | [PATCH perf/core v10 14/23] perf probe: Accept %sdt and %cached event name |
| Message-ID | <rHI7T-6Pu-9@gated-at.bofh.it> |
| In reply to | #1417162 |
From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
To improbe usability, support %[PROVIDER:]SDTEVENT format to
add new probes on SDT and cached events.
e.g.
----
# perf probe -x /lib/libc-2.17.so %lll_lock_wait_private
Added new event:
sdt_libc:lll_lock_wait_private (on %lll_lock_wait_private in
/usr/lib/libc-2.17.so)
You can now use it in all perf tools, such as:
perf record -e sdt_libc:lll_lock_wait_private -aR sleep 1
# perf probe -l | more
sdt_libc:lll_lock_wait_private (on __lll_lock_wait_private+21
in /usr/lib/libc-2.17.so)
----
Note that this is not only for SDT events, but also normal
events with event-name.
e.g. define "myevent" on cache (-n doesn't add the real probe)
----
# perf probe -x ./perf --cache -n --add 'myevent=dso__load $params'
----
Reuse the "myevent" from cache as below.
----
# perf probe -x ./perf %myevent
----
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
Changes in v10:
- Update Documentation/perf-probe.txt to add a link about SDT.
Changes in v7:
- Fix a bug to return an error if no SDT/cached events found in cache.
---
tools/perf/Documentation/perf-probe.txt | 9 +++
tools/perf/util/probe-event.c | 82 ++++++++++++++++++++++---------
tools/perf/util/probe-event.h | 1
tools/perf/util/probe-file.c | 9 +++
4 files changed, 76 insertions(+), 25 deletions(-)
diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt
index 7a258e9..39e3870 100644
--- a/tools/perf/Documentation/perf-probe.txt
+++ b/tools/perf/Documentation/perf-probe.txt
@@ -151,6 +151,8 @@ Probe points are defined by following syntax.
3) Define event based on source file with lazy pattern
[[GROUP:]EVENT=]SRC;PTN [ARG ...]
+ 4) Pre-defined SDT events or cached event with name
+ %[PROVIDER:]SDTEVENT
'EVENT' specifies the name of new event, if omitted, it will be set the name of the probed function. You can also specify a group name by 'GROUP', if omitted, set 'probe' is used for kprobe and 'probe_<bin>' is used for uprobe.
Note that using existing group name can conflict with other events. Especially, using the group name reserved for kernel modules can hide embedded events in the
@@ -158,6 +160,11 @@ modules.
'FUNC' specifies a probed function name, and it may have one of the following options; '+OFFS' is the offset from function entry address in bytes, ':RLN' is the relative-line number from function entry line, and '%return' means that it probes function return. And ';PTN' means lazy matching pattern (see LAZY MATCHING). Note that ';PTN' must be the end of the probe point definition. In addition, '@SRC' specifies a source file which has that function.
It is also possible to specify a probe point by the source line number or lazy matching by using 'SRC:ALN' or 'SRC;PTN' syntax, where 'SRC' is the source file path, ':ALN' is the line number and ';PTN' is the lazy matching pattern.
'ARG' specifies the arguments of this probe point, (see PROBE ARGUMENT).
+'SDTEVENT' and 'PROVIDER' is the pre-defined event name which is defined by user SDT (Statically Defined Tracing) or the pre-cached probes with event name.
+Note that before using the SDT event, the target binary (on which SDT events are defined) must be scanned by linkperf:perf-buildid-cache[1] to make SDT events as cached events.
+
+For details of the SDT, see below.
+https://sourceware.org/gdb/onlinedocs/gdb/Static-Probe-Points.html
PROBE ARGUMENT
--------------
@@ -237,4 +244,4 @@ Add probes at malloc() function on libc
SEE ALSO
--------
-linkperf:perf-trace[1], linkperf:perf-record[1]
+linkperf:perf-trace[1], linkperf:perf-record[1], linkperf:perf-buildid-cache[1]
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 2178d26..443340f 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1199,6 +1199,34 @@ err:
return err;
}
+static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev)
+{
+ char *ptr;
+
+ ptr = strchr(*arg, ':');
+ if (ptr) {
+ *ptr = '\0';
+ if (!is_c_func_name(*arg))
+ goto ng_name;
+ pev->group = strdup(*arg);
+ if (!pev->group)
+ return -ENOMEM;
+ *arg = ptr + 1;
+ } else
+ pev->group = NULL;
+ if (!is_c_func_name(*arg)) {
+ng_name:
+ semantic_error("%s is bad for event name -it must "
+ "follow C symbol-naming rule.\n", *arg);
+ return -EINVAL;
+ }
+ pev->event = strdup(*arg);
+ if (pev->event == NULL)
+ return -ENOMEM;
+
+ return 0;
+}
+
/* Parse probepoint definition. */
static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
{
@@ -1206,38 +1234,43 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
char *ptr, *tmp;
char c, nc = 0;
bool file_spec = false;
+ int ret;
+
/*
* <Syntax>
* perf probe [GRP:][EVENT=]SRC[:LN|;PTN]
* perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
+ * perf probe %[GRP:]SDT_EVENT
*/
if (!arg)
return -EINVAL;
+ if (arg[0] == '%') {
+ pev->sdt = true;
+ arg++;
+ }
+
ptr = strpbrk(arg, ";=@+%");
- if (ptr && *ptr == '=') { /* Event name */
- *ptr = '\0';
- tmp = ptr + 1;
- ptr = strchr(arg, ':');
+ if (pev->sdt) {
if (ptr) {
- *ptr = '\0';
- if (!is_c_func_name(arg))
- goto not_fname;
- pev->group = strdup(arg);
- if (!pev->group)
- return -ENOMEM;
- arg = ptr + 1;
- } else
- pev->group = NULL;
- if (!is_c_func_name(arg)) {
-not_fname:
- semantic_error("%s is bad for event name -it must "
- "follow C symbol-naming rule.\n", arg);
+ semantic_error("%s must contain only an SDT event name.\n", arg);
return -EINVAL;
}
- pev->event = strdup(arg);
- if (pev->event == NULL)
- return -ENOMEM;
+ ret = parse_perf_probe_event_name(&arg, pev);
+ if (ret == 0) {
+ if (asprintf(&pev->point.function, "%%%s", pev->event) < 0)
+ ret = -errno;
+ }
+ return ret;
+ }
+
+ if (ptr && *ptr == '=') { /* Event name */
+ *ptr = '\0';
+ tmp = ptr + 1;
+ ret = parse_perf_probe_event_name(&arg, pev);
+ if (ret < 0)
+ return ret;
+
arg = tmp;
}
@@ -2876,7 +2909,8 @@ static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,
entry = probe_cache__find(cache, pev);
if (!entry) {
- ret = 0;
+ /* SDT must be in the cache */
+ ret = pev->sdt ? -ENOENT : 0;
goto out;
}
@@ -2915,7 +2949,7 @@ static int convert_to_probe_trace_events(struct perf_probe_event *pev,
{
int ret;
- if (!pev->group) {
+ if (!pev->group && !pev->sdt) {
/* Set group name if not given */
if (!pev->uprobes) {
pev->group = strdup(PERFPROBE_GROUP);
@@ -2934,8 +2968,8 @@ static int convert_to_probe_trace_events(struct perf_probe_event *pev,
/* At first, we need to lookup cache entry */
ret = find_probe_trace_events_from_cache(pev, tevs);
- if (ret > 0)
- return ret; /* Found in probe cache */
+ if (ret > 0 || pev->sdt) /* SDT can be found only in the cache */
+ return ret == 0 ? -ENOENT : ret; /* Found in probe cache */
if (arch__prefers_symtab() && !perf_probe_event_need_dwarf(pev)) {
ret = find_probe_trace_events_from_map(pev, tevs);
diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
index 432b690..e18ea9f 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -85,6 +85,7 @@ struct perf_probe_event {
char *group; /* Group name */
struct perf_probe_point point; /* Probe point */
int nargs; /* Number of arguments */
+ bool sdt; /* SDT/cached event flag */
bool uprobes; /* Uprobe event flag */
char *target; /* Target binary */
struct perf_probe_arg *args; /* Arguments */
diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
index 0fcd275..a222fb2 100644
--- a/tools/perf/util/probe-file.c
+++ b/tools/perf/util/probe-file.c
@@ -538,6 +538,15 @@ probe_cache__find(struct probe_cache *pcache, struct perf_probe_event *pev)
return NULL;
list_for_each_entry(entry, &pcache->list, list) {
+ if (pev->sdt) {
+ if (entry->pev.event &&
+ streql(entry->pev.event, pev->event) &&
+ (!pev->group ||
+ streql(entry->pev.group, pev->group)))
+ goto found;
+
+ continue;
+ }
/* Hit if same event name or same command-string */
if ((pev->event &&
(streql(entry->pev.group, pev->group) &&
[toc] | [prev] | [next] | [standalone]
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-06-08 11:40 +0200 |
| Subject | [PATCH perf/core v10 18/23] perf probe: Allow wildcard for cached events |
| Message-ID | <rHI7T-6Pu-13@gated-at.bofh.it> |
| In reply to | #1417162 |
Allo glob wildcard for reusing cached/SDT events. E.g.
# perf probe -x /usr/lib64/libc-2.20.so -a %sdt_libc:\*
This example adds probes for all SDT in libc.
Note that the SDTs must have been scanned by perf buildid-cache.
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
Changes in v10:
- Split off bugfix, adding interface, and target search patches.
- Do not export clear_probe_trace_events().
Changes in v7:
- Continue to search caches if a build-id cache has no probe cache.
- Make probe_cache__open() to accept DSO__NAME_KALLSYMS for kernel.
- Fix to add probes correctly when a wildcard matchs both of
uprobes and kprobes.
Changes in v5.1:
- Fix a SEGV bug when a group name is omitted. (Thanks Hemant!)
---
tools/perf/util/probe-event.c | 107 +++++++++++++++++++++++++++++++++++++++--
tools/perf/util/probe-file.c | 38 ++++++++++++---
tools/perf/util/probe-file.h | 3 +
3 files changed, 138 insertions(+), 10 deletions(-)
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 443340f..f692fd5 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1206,7 +1206,7 @@ static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev)
ptr = strchr(*arg, ':');
if (ptr) {
*ptr = '\0';
- if (!is_c_func_name(*arg))
+ if (!pev->sdt && !is_c_func_name(*arg))
goto ng_name;
pev->group = strdup(*arg);
if (!pev->group)
@@ -1214,7 +1214,7 @@ static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev)
*arg = ptr + 1;
} else
pev->group = NULL;
- if (!is_c_func_name(*arg)) {
+ if (!pev->sdt && !is_c_func_name(*arg)) {
ng_name:
semantic_error("%s is bad for event name -it must "
"follow C symbol-naming rule.\n", *arg);
@@ -1644,6 +1644,7 @@ int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
ret = -ENOMEM;
goto out;
}
+ tev->uprobes = (tp->module[0] == '/');
p++;
} else
p = argv[1];
@@ -2518,7 +2519,7 @@ static int probe_trace_event__set_name(struct probe_trace_event *tev,
int ret;
/* If probe_event or trace_event already have the name, reuse it */
- if (pev->event)
+ if (pev->event && !pev->sdt)
event = pev->event;
else if (tev->event)
event = tev->event;
@@ -2531,7 +2532,7 @@ static int probe_trace_event__set_name(struct probe_trace_event *tev,
else
event = tev->point.realname;
}
- if (pev->group)
+ if (pev->group && !pev->sdt)
group = pev->group;
else if (tev->group)
group = tev->group;
@@ -2894,6 +2895,100 @@ errout:
bool __weak arch__prefers_symtab(void) { return false; }
+/* Concatinate two arrays */
+static void *memcat(void *a, size_t sz_a, void *b, size_t sz_b)
+{
+ void *ret;
+
+ ret = malloc(sz_a + sz_b);
+ if (ret) {
+ memcpy(ret, a, sz_a);
+ memcpy(ret + sz_a, b, sz_b);
+ }
+ return ret;
+}
+
+static int
+concat_probe_trace_events(struct probe_trace_event **tevs, int *ntevs,
+ struct probe_trace_event **tevs2, int ntevs2)
+{
+ struct probe_trace_event *new_tevs;
+ int ret = 0;
+
+ if (ntevs == 0) {
+ *tevs = *tevs2;
+ *ntevs = ntevs2;
+ *tevs2 = NULL;
+ return 0;
+ }
+
+ if (*ntevs + ntevs2 > probe_conf.max_probes)
+ ret = -E2BIG;
+ else {
+ /* Concatinate the array of probe_trace_event */
+ new_tevs = memcat(*tevs, (*ntevs) * sizeof(**tevs),
+ *tevs2, ntevs2 * sizeof(**tevs2));
+ if (!new_tevs)
+ ret = -ENOMEM;
+ else {
+ free(*tevs);
+ *tevs = new_tevs;
+ *ntevs += ntevs2;
+ }
+ }
+ if (ret < 0)
+ clear_probe_trace_events(*tevs2, ntevs2);
+ zfree(tevs2);
+
+ return ret;
+}
+
+/*
+ * Try to find probe_trace_event from given probe caches. Return the number
+ * of cached events found, if an error occurs return the error.
+ */
+static int find_cached_events(struct perf_probe_event *pev,
+ struct probe_trace_event **tevs,
+ const char *target)
+{
+ struct probe_cache *cache;
+ struct probe_cache_entry *entry;
+ struct probe_trace_event *tmp_tevs = NULL;
+ int ntevs = 0;
+ int ret = 0;
+
+ cache = probe_cache__new(target);
+ /* Return 0 ("not found") if the target has no probe cache. */
+ if (!cache)
+ return 0;
+
+ for_each_probe_cache_entry(entry, cache) {
+ /* Skip the cache entry which has no name */
+ if (!entry->pev.event || !entry->pev.group)
+ continue;
+ if ((!pev->group || strglobmatch(entry->pev.group, pev->group)) &&
+ strglobmatch(entry->pev.event, pev->event)) {
+ ret = probe_cache_entry__get_event(entry, &tmp_tevs);
+ if (ret > 0)
+ ret = concat_probe_trace_events(tevs, &ntevs,
+ &tmp_tevs, ret);
+ if (ret < 0)
+ break;
+ }
+ }
+ probe_cache__delete(cache);
+ if (ret < 0) {
+ clear_probe_trace_events(*tevs, ntevs);
+ zfree(tevs);
+ } else {
+ ret = ntevs;
+ if (ntevs > 0 && target && target[0] == '/')
+ pev->uprobes = true;
+ }
+
+ return ret;
+}
+
static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,
struct probe_trace_event **tevs)
{
@@ -2903,6 +2998,10 @@ static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,
struct str_node *node;
int ret, i;
+ if (pev->sdt)
+ /* For SDT/cached events, we use special search functions */
+ return find_cached_events(pev, tevs, pev->target);
+
cache = probe_cache__new(pev->target);
if (!cache)
return 0;
diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
index 7b60380..3a1d42a 100644
--- a/tools/perf/util/probe-file.c
+++ b/tools/perf/util/probe-file.c
@@ -360,13 +360,38 @@ probe_cache_entry__new(struct perf_probe_event *pev)
return ret;
}
-/* For the kernel probe caches, pass target = NULL */
+int probe_cache_entry__get_event(struct probe_cache_entry *entry,
+ struct probe_trace_event **tevs)
+{
+ struct probe_trace_event *tev;
+ struct str_node *node;
+ int ret, i;
+
+ ret = strlist__nr_entries(entry->tevlist);
+ if (ret > probe_conf.max_probes)
+ return -E2BIG;
+
+ *tevs = zalloc(ret * sizeof(*tev));
+ if (!*tevs)
+ return -ENOMEM;
+
+ i = 0;
+ strlist__for_each(node, entry->tevlist) {
+ tev = &(*tevs)[i++];
+ ret = parse_probe_trace_command(node->s, tev);
+ if (ret < 0)
+ break;
+ }
+ return i;
+}
+
+/* For the kernel probe caches, pass target = NULL or DSO__NAME_KALLSYMS */
static int probe_cache__open(struct probe_cache *pcache, const char *target)
{
char cpath[PATH_MAX];
char sbuildid[SBUILD_ID_SIZE];
char *dir_name = NULL;
- bool is_kallsyms = !target;
+ bool is_kallsyms = false;
int ret, fd;
if (target && build_id_cache__cached(target)) {
@@ -376,12 +401,13 @@ static int probe_cache__open(struct probe_cache *pcache, const char *target)
goto found;
}
- if (target)
- ret = filename__sprintf_build_id(target, sbuildid);
- else {
+ if (!target || !strcmp(target, DSO__NAME_KALLSYMS)) {
target = DSO__NAME_KALLSYMS;
+ is_kallsyms = true;
ret = sysfs__sprintf_build_id("/", sbuildid);
- }
+ } else
+ ret = filename__sprintf_build_id(target, sbuildid);
+
if (ret < 0) {
pr_debug("Failed to get build-id from %s.\n", target);
return ret;
diff --git a/tools/perf/util/probe-file.h b/tools/perf/util/probe-file.h
index 6271ec6..0faf083 100644
--- a/tools/perf/util/probe-file.h
+++ b/tools/perf/util/probe-file.h
@@ -36,6 +36,9 @@ int probe_file__get_events(int fd, struct strfilter *filter,
struct strlist *plist);
int probe_file__del_strlist(int fd, struct strlist *namelist);
+int probe_cache_entry__get_event(struct probe_cache_entry *entry,
+ struct probe_trace_event **tevs);
+
struct probe_cache *probe_cache__new(const char *target);
int probe_cache__add_entry(struct probe_cache *pcache,
struct perf_probe_event *pev,
[toc] | [prev] | [next] | [standalone]
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-06-08 11:40 +0200 |
| Subject | [PATCH perf/core v10 22/23] perf build: Add sdt feature detection |
| Message-ID | <rHI7T-6Pu-11@gated-at.bofh.it> |
| In reply to | #1417162 |
Will be used to define SDT events in perf test code.
---
tools/perf/Makefile.perf | 3 +++
tools/perf/config/Makefile | 10 ++++++++++
tools/perf/tests/make | 3 ++-
3 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
index 57c8f98..6bc7767 100644
--- a/tools/build/Makefile.feature
+++ b/tools/build/Makefile.feature
@@ -60,7 +60,8 @@ FEATURE_TESTS_BASIC := \
zlib \
lzma \
get_cpuid \
- bpf
+ bpf \
+ sdt
# FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
# of all feature tests
diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index 3d88f09..82d357f 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -43,7 +43,8 @@ FILES= \
test-zlib.bin \
test-lzma.bin \
test-bpf.bin \
- test-get_cpuid.bin
+ test-get_cpuid.bin \
+ test-sdt.bin
FILES := $(addprefix $(OUTPUT),$(FILES))
@@ -205,6 +206,9 @@ $(OUTPUT)test-get_cpuid.bin:
$(OUTPUT)test-bpf.bin:
$(BUILD)
+$(OUTPUT)test-sdt.bin:
+ $(BUILD)
+
-include $(OUTPUT)*.d
###############################
diff --git a/tools/build/feature/test-all.c b/tools/build/feature/test-all.c
index a282e8c..f538c5f 100644
--- a/tools/build/feature/test-all.c
+++ b/tools/build/feature/test-all.c
@@ -137,6 +137,10 @@
# include "test-libcrypto.c"
#undef main
+#define main main_test_sdt
+# include "test-sdt.c"
+#undef main
+
int main(int argc, char *argv[])
{
main_test_libpython();
@@ -168,6 +172,7 @@ int main(int argc, char *argv[])
main_test_get_cpuid();
main_test_bpf();
main_test_libcrypto();
+ main_test_sdt();
return 0;
}
diff --git a/tools/build/feature/test-sdt.c b/tools/build/feature/test-sdt.c
new file mode 100644
index 0000000..e4531a6
--- /dev/null
+++ b/tools/build/feature/test-sdt.c
@@ -0,0 +1,7 @@
+#include <sys/sdt.h>
+
+int main(void)
+{
+ DTRACE_PROBE(provider, name);
+ return 0;
+}
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index bde8cba..a818388 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -81,6 +81,9 @@ include ../scripts/utilities.mak
#
# Define NO_LIBBPF if you do not want BPF support
#
+# Define NO_SDT if you do not want to define SDT event in perf tools,
+# note that it doesn't disable SDT scanning support.
+#
# Define FEATURES_DUMP to provide features detection dump file
# and bypass the feature detection
diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index 1e46277..641a82a 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -331,6 +331,16 @@ ifndef NO_LIBELF
endif # NO_LIBBPF
endif # NO_LIBELF
+ifndef NO_SDT
+ ifneq ($(feature-sdt), 1)
+ msg := $(warning No sys/sdt.h found, no SDT events are defined, please install systemtap-sdt-devel or systemtap-sdt-dev);
+ NO_SDT := 1;
+ else
+ CFLAGS += -DHAVE_SDT_EVENT
+ $(call detected,CONFIG_SDT_EVENT)
+ endif
+endif
+
ifdef PERF_HAVE_JITDUMP
ifndef NO_DWARF
$(call detected,CONFIG_JITDUMP)
diff --git a/tools/perf/tests/make b/tools/perf/tests/make
index cac15d9..ac801be 100644
--- a/tools/perf/tests/make
+++ b/tools/perf/tests/make
@@ -81,6 +81,7 @@ make_no_libbionic := NO_LIBBIONIC=1
make_no_auxtrace := NO_AUXTRACE=1
make_no_libbpf := NO_LIBBPF=1
make_no_libcrypto := NO_LIBCRYPTO=1
+make_no_sdt := NO_SDT=1
make_tags := tags
make_cscope := cscope
make_help := help
@@ -104,7 +105,7 @@ make_minimal := NO_LIBPERL=1 NO_LIBPYTHON=1 NO_NEWT=1 NO_GTK2=1
make_minimal += NO_DEMANGLE=1 NO_LIBELF=1 NO_LIBUNWIND=1 NO_BACKTRACE=1
make_minimal += NO_LIBNUMA=1 NO_LIBAUDIT=1 NO_LIBBIONIC=1
make_minimal += NO_LIBDW_DWARF_UNWIND=1 NO_AUXTRACE=1 NO_LIBBPF=1
-make_minimal += NO_LIBCRYPTO=1
+make_minimal += NO_LIBCRYPTO=1 NO_SDT=1
# $(run) contains all available tests
run := make_pure
[toc] | [prev] | [next] | [standalone]
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-06-08 11:40 +0200 |
| Subject | [PATCH perf/core v10 15/23] perf-list: Show SDT and pre-cached events |
| Message-ID | <rHI7U-6Pu-17@gated-at.bofh.it> |
| In reply to | #1417162 |
From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Show SDT and pre-cached events by perf-list with "sdt". This also
shows the binary and build-id where the events are placed only
when there are same name events on different binaries.
e.g.
----
# perf list sdt
List of pre-defined events (to be used in -e):
sdt_libc:lll_futex_wake [SDT event]
sdt_libc:lll_lock_wait_private [SDT event]
sdt_libc:longjmp [SDT event]
sdt_libc:longjmp_target [SDT event]
...
sdt_libstdcxx:rethrow@/usr/bin/gcc(0cc207fc4b27) [SDT event]
sdt_libstdcxx:rethrow@/usr/lib64/libstdc++.so.6.0.20(91c7a88fdf49)
sdt_libstdcxx:throw@/usr/bin/gcc(0cc207fc4b27) [SDT event]
sdt_libstdcxx:throw@/usr/lib64/libstdc++.so.6.0.20(91c7a88fdf49)
----
The binary path and build-id are shown in below format;
<GROUP>:<EVENT>@<PATH>(<BUILD-ID>)
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
Changes in v9:
- Update list_usage too. (Thanks Hemant!)
Changes in v5:
- Fix a build error for minimal option.
Changes in v4:
- Update patch description.
- Change event list format.
---
tools/perf/builtin-list.c | 6 ++-
tools/perf/util/parse-events.c | 83 ++++++++++++++++++++++++++++++++++++++++
tools/perf/util/parse-events.h | 2 +
tools/perf/util/probe-file.h | 9 ++++
4 files changed, 99 insertions(+), 1 deletion(-)
diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
index 5e22db4..88ee419 100644
--- a/tools/perf/builtin-list.c
+++ b/tools/perf/builtin-list.c
@@ -25,7 +25,7 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
OPT_END()
};
const char * const list_usage[] = {
- "perf list [hw|sw|cache|tracepoint|pmu|event_glob]",
+ "perf list [hw|sw|cache|tracepoint|pmu|sdt|event_glob]",
NULL
};
@@ -62,6 +62,8 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
print_hwcache_events(NULL, raw_dump);
else if (strcmp(argv[i], "pmu") == 0)
print_pmu_events(NULL, raw_dump);
+ else if (strcmp(argv[i], "sdt") == 0)
+ print_sdt_events(NULL, NULL, raw_dump);
else if ((sep = strchr(argv[i], ':')) != NULL) {
int sep_idx;
@@ -76,6 +78,7 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
s[sep_idx] = '\0';
print_tracepoint_events(s, s + sep_idx + 1, raw_dump);
+ print_sdt_events(s, s + sep_idx + 1, raw_dump);
free(s);
} else {
if (asprintf(&s, "*%s*", argv[i]) < 0) {
@@ -89,6 +92,7 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
print_hwcache_events(s, raw_dump);
print_pmu_events(s, raw_dump);
print_tracepoint_events(NULL, s, raw_dump);
+ print_sdt_events(NULL, s, raw_dump);
free(s);
}
}
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 89d40bb..4c7437f 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -20,6 +20,7 @@
#include "pmu.h"
#include "thread_map.h"
#include "cpumap.h"
+#include "probe-file.h"
#include "asm/bug.h"
#define MAX_NAME_LEN 100
@@ -1984,6 +1985,86 @@ static bool is_event_supported(u8 type, unsigned config)
return ret;
}
+void print_sdt_events(const char *subsys_glob, const char *event_glob,
+ bool name_only)
+{
+ struct probe_cache *pcache;
+ struct probe_cache_entry *ent;
+ struct strlist *bidlist, *sdtlist;
+ struct strlist_config cfg = {.dont_dupstr = true};
+ struct str_node *nd, *nd2;
+ char *buf, *path, *ptr = NULL;
+ bool show_detail = false;
+ int ret;
+
+ sdtlist = strlist__new(NULL, &cfg);
+ if (!sdtlist) {
+ pr_debug("Failed to allocate new strlist for SDT\n");
+ return;
+ }
+ ret = build_id_cache__list_all(&bidlist);
+ if (ret < 0) {
+ pr_debug("Failed to get buildids: %d\n", ret);
+ return;
+ }
+ strlist__for_each(nd, bidlist) {
+ pcache = probe_cache__new(nd->s);
+ if (!pcache)
+ continue;
+ if (!list_empty(&pcache->list))
+ list_for_each_entry(ent, &pcache->list, list) {
+ if (!ent->sdt)
+ continue;
+ if (subsys_glob &&
+ !strglobmatch(ent->pev.group, subsys_glob))
+ continue;
+ if (event_glob &&
+ !strglobmatch(ent->pev.event, event_glob))
+ continue;
+ ret = asprintf(&buf, "%s:%s@%s", ent->pev.group,
+ ent->pev.event, nd->s);
+ if (ret > 0)
+ strlist__add(sdtlist, buf);
+ }
+ probe_cache__delete(pcache);
+ }
+ strlist__delete(bidlist);
+
+ strlist__for_each(nd, sdtlist) {
+ buf = strchr(nd->s, '@');
+ if (buf)
+ *(buf++) = '\0';
+ if (name_only) {
+ printf("%s ", nd->s);
+ continue;
+ }
+ nd2 = strlist__next(nd);
+ if (nd2) {
+ ptr = strchr(nd2->s, '@');
+ if (ptr)
+ *ptr = '\0';
+ if (strcmp(nd->s, nd2->s) == 0)
+ show_detail = true;
+ }
+ if (show_detail) {
+ path = build_id_cache__origname(buf);
+ ret = asprintf(&buf, "%s@%s(%.12s)", nd->s, path, buf);
+ if (ret > 0) {
+ printf(" %-50s [%s]\n", buf, "SDT event");
+ free(buf);
+ }
+ } else
+ printf(" %-50s [%s]\n", nd->s, "SDT event");
+ if (nd2) {
+ if (strcmp(nd->s, nd2->s) != 0)
+ show_detail = false;
+ if (ptr)
+ *ptr = '@';
+ }
+ }
+ strlist__delete(sdtlist);
+}
+
int print_hwcache_events(const char *event_glob, bool name_only)
{
unsigned int type, op, i, evt_i = 0, evt_num = 0;
@@ -2166,6 +2247,8 @@ void print_events(const char *event_glob, bool name_only)
}
print_tracepoint_events(NULL, NULL, name_only);
+
+ print_sdt_events(NULL, NULL, name_only);
}
int parse_events__is_hardcoded_term(struct parse_events_term *term)
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index 46c05cc..7325c9a 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -183,6 +183,8 @@ void print_symbol_events(const char *event_glob, unsigned type,
void print_tracepoint_events(const char *subsys_glob, const char *event_glob,
bool name_only);
int print_hwcache_events(const char *event_glob, bool name_only);
+void print_sdt_events(const char *subsys_glob, const char *event_glob,
+ bool name_only);
int is_valid_tracepoint(const char *event_string);
int valid_event_mount(const char *eventfs);
diff --git a/tools/perf/util/probe-file.h b/tools/perf/util/probe-file.h
index 93aa193..ce98162 100644
--- a/tools/perf/util/probe-file.h
+++ b/tools/perf/util/probe-file.h
@@ -22,6 +22,8 @@ struct probe_cache {
#define PF_FL_UPROBE 1
#define PF_FL_RW 2
+/* probe-file.c depends on libelf */
+#ifdef HAVE_LIBELF_SUPPORT
int probe_file__open(int flag);
int probe_file__open_both(int *kfd, int *ufd, int flag);
struct strlist *probe_file__get_namelist(int fd);
@@ -46,4 +48,11 @@ struct probe_cache_entry *probe_cache__find(struct probe_cache *pcache,
struct probe_cache_entry *probe_cache__find_by_name(struct probe_cache *pcache,
const char *group, const char *event);
int probe_cache__show_all_caches(struct strfilter *filter);
+#else /* ! HAVE_LIBELF_SUPPORT */
+static inline struct probe_cache *probe_cache__new(const char *tgt __maybe_unused)
+{
+ return NULL;
+}
+#define probe_cache__delete(pcache) do {} while(0)
+#endif
#endif
[toc] | [prev] | [next] | [standalone]
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-06-08 11:40 +0200 |
| Subject | [PATCH perf/core v10 10/23] perf probe: Remove caches when --cache is given |
| Message-ID | <rHI7U-6Pu-15@gated-at.bofh.it> |
| In reply to | #1417162 |
From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
perf-probe --del removes caches when --cache is given.
Note that the delete pattern is not same as normal events.
If you cached probes with event name, --del "eventname"
works as expected. However, if you skipped it, the cached
probes doesn't have actual event name. In that case
--del "probe-desc" is required (wildcard is acceptable).
For example a cache entry has the probe-desc "vfs_read $params",
you can remove it with --del 'vfs_read*'.
-----
# perf probe --cache --list
/[kernel.kallsyms] (1466a0a250b5d0070c6d0f03c5fed30b237970a1):
vfs_read $params
/usr/lib64/libc-2.17.so (c31ffe7942bfd77b2fca8f9bd5709d387a86d3bc):
getaddrinfo $params
# perf probe --cache --del vfs_read\*
Removed cached event: probe:vfs_read
# perf probe --cache --list
/[kernel.kallsyms] (1466a0a250b5d0070c6d0f03c5fed30b237970a1):
/usr/lib64/libc-2.17.so (c31ffe7942bfd77b2fca8f9bd5709d387a86d3bc):
getaddrinfo $params
-----
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
Changes in v9:
- Fix to show which event is deleted (Thanks Hemant!)
Changes in v4:
- move del_perf_probe_caches() into builtin-probe.c since
command-line related delete procedure is there now.
---
tools/perf/Documentation/perf-probe.txt | 1 +
tools/perf/builtin-probe.c | 27 +++++++++++++++++++++++++
tools/perf/util/probe-file.c | 34 +++++++++++++++++++++++++------
tools/perf/util/probe-file.h | 2 ++
4 files changed, 57 insertions(+), 7 deletions(-)
diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt
index 5a70d45..8d09173 100644
--- a/tools/perf/Documentation/perf-probe.txt
+++ b/tools/perf/Documentation/perf-probe.txt
@@ -116,6 +116,7 @@ OPTIONS
(With --add) Cache the probes. Any events which successfully added
are also stored in the cache file.
(With --list) Show cached probes.
+ (With --del) Remove cached probes.
--max-probes=NUM::
Set the maximum number of probe points for an event. Default is 128.
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 53e380c0e..8f61525 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -363,6 +363,30 @@ out_cleanup:
return ret;
}
+static int del_perf_probe_caches(struct strfilter *filter)
+{
+ struct probe_cache *cache;
+ struct strlist *bidlist;
+ struct str_node *nd;
+ int ret;
+
+ ret = build_id_cache__list_all(&bidlist);
+ if (ret < 0) {
+ pr_debug("Failed to get buildids: %d\n", ret);
+ return ret;
+ }
+
+ strlist__for_each(nd, bidlist) {
+ cache = probe_cache__new(nd->s);
+ if (!cache)
+ continue;
+ probe_cache__remove_entries(cache, filter);
+ probe_cache__commit(cache);
+ probe_cache__delete(cache);
+ }
+ return 0;
+}
+
static int perf_del_probe_events(struct strfilter *filter)
{
int ret, ret2, ufd = -1, kfd = -1;
@@ -375,6 +399,9 @@ static int perf_del_probe_events(struct strfilter *filter)
pr_debug("Delete filter: \'%s\'\n", str);
+ if (probe_conf.cache)
+ return del_perf_probe_caches(filter);
+
/* Get current event names */
ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
if (ret < 0)
diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
index a6d4a67..f687607 100644
--- a/tools/perf/util/probe-file.c
+++ b/tools/perf/util/probe-file.c
@@ -660,19 +660,39 @@ out:
return ret;
}
+static bool probe_cache_entry__compare(struct probe_cache_entry *entry,
+ struct strfilter *filter)
+{
+ char buf[128], *ptr = entry->spev;
+
+ if (entry->pev.event) {
+ snprintf(buf, 128, "%s:%s", entry->pev.group, entry->pev.event);
+ ptr = buf;
+ }
+ return strfilter__compare(filter, ptr);
+}
+
+int probe_cache__remove_entries(struct probe_cache *pcache,
+ struct strfilter *filter)
+{
+ struct probe_cache_entry *entry, *tmp;
+
+ list_for_each_entry_safe(entry, tmp, &pcache->list, list) {
+ if (probe_cache_entry__compare(entry, filter)) {
+ pr_info("Removed cached event: %s\n", entry->spev);
+ probe_cache_entry__delete(entry);
+ }
+ }
+ return 0;
+}
+
static int probe_cache__show_entries(struct probe_cache *pcache,
struct strfilter *filter)
{
struct probe_cache_entry *entry;
- char buf[128], *ptr;
list_for_each_entry(entry, &pcache->list, list) {
- if (entry->pev.event) {
- ptr = buf;
- snprintf(buf, 128, "%s:%s", entry->pev.group, entry->pev.event);
- } else
- ptr = entry->spev;
- if (strfilter__compare(filter, ptr))
+ if (probe_cache_entry__compare(entry, filter))
printf("%s\n", entry->spev);
}
return 0;
diff --git a/tools/perf/util/probe-file.h b/tools/perf/util/probe-file.h
index ac70446..e6fd9b9 100644
--- a/tools/perf/util/probe-file.h
+++ b/tools/perf/util/probe-file.h
@@ -37,6 +37,8 @@ int probe_cache__add_entry(struct probe_cache *pcache,
struct probe_trace_event *tevs, int ntevs);
int probe_cache__commit(struct probe_cache *pcache);
void probe_cache__delete(struct probe_cache *pcache);
+int probe_cache__remove_entries(struct probe_cache *pcache,
+ struct strfilter *filter);
struct probe_cache_entry *probe_cache__find(struct probe_cache *pcache,
struct perf_probe_event *pev);
struct probe_cache_entry *probe_cache__find_by_name(struct probe_cache *pcache,
[toc] | [prev] | [next] | [standalone]
| From | Arnaldo Carvalho de Melo <acme@kernel.org> |
|---|---|
| Date | 2016-06-09 16:30 +0200 |
| Subject | Re: [PATCH perf/core v10 10/23] perf probe: Remove caches when --cache is given |
| Message-ID | <rI985-7ym-11@gated-at.bofh.it> |
| In reply to | #1417172 |
Em Wed, Jun 08, 2016 at 06:30:40PM +0900, Masami Hiramatsu escreveu:
> From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
>
> perf-probe --del removes caches when --cache is given.
> Note that the delete pattern is not same as normal events.
>
> If you cached probes with event name, --del "eventname"
> works as expected. However, if you skipped it, the cached
> probes doesn't have actual event name. In that case
> --del "probe-desc" is required (wildcard is acceptable).
> For example a cache entry has the probe-desc "vfs_read $params",
> you can remove it with --del 'vfs_read*'.
>
> -----
> # perf probe --cache --list
> /[kernel.kallsyms] (1466a0a250b5d0070c6d0f03c5fed30b237970a1):
> vfs_read $params
> /usr/lib64/libc-2.17.so (c31ffe7942bfd77b2fca8f9bd5709d387a86d3bc):
> getaddrinfo $params
>
> # perf probe --cache --del vfs_read\*
> Removed cached event: probe:vfs_read
>
> # perf probe --cache --list
> /[kernel.kallsyms] (1466a0a250b5d0070c6d0f03c5fed30b237970a1):
> /usr/lib64/libc-2.17.so (c31ffe7942bfd77b2fca8f9bd5709d387a86d3bc):
> getaddrinfo $params
> -----
>
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
> ---
> Changes in v9:
> - Fix to show which event is deleted (Thanks Hemant!)
> Changes in v4:
> - move del_perf_probe_caches() into builtin-probe.c since
> command-line related delete procedure is there now.
> ---
> tools/perf/Documentation/perf-probe.txt | 1 +
> tools/perf/builtin-probe.c | 27 +++++++++++++++++++++++++
> tools/perf/util/probe-file.c | 34 +++++++++++++++++++++++++------
> tools/perf/util/probe-file.h | 2 ++
> 4 files changed, 57 insertions(+), 7 deletions(-)
>
> diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt
> index 5a70d45..8d09173 100644
> --- a/tools/perf/Documentation/perf-probe.txt
> +++ b/tools/perf/Documentation/perf-probe.txt
> @@ -116,6 +116,7 @@ OPTIONS
> (With --add) Cache the probes. Any events which successfully added
> are also stored in the cache file.
> (With --list) Show cached probes.
> + (With --del) Remove cached probes.
>
> --max-probes=NUM::
> Set the maximum number of probe points for an event. Default is 128.
> diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
> index 53e380c0e..8f61525 100644
> --- a/tools/perf/builtin-probe.c
> +++ b/tools/perf/builtin-probe.c
> @@ -363,6 +363,30 @@ out_cleanup:
> return ret;
> }
>
> +static int del_perf_probe_caches(struct strfilter *filter)
> +{
> + struct probe_cache *cache;
> + struct strlist *bidlist;
> + struct str_node *nd;
> + int ret;
> +
> + ret = build_id_cache__list_all(&bidlist);
> + if (ret < 0) {
> + pr_debug("Failed to get buildids: %d\n", ret);
> + return ret;
> + }
> +
> + strlist__for_each(nd, bidlist) {
> + cache = probe_cache__new(nd->s);
> + if (!cache)
> + continue;
> + probe_cache__remove_entries(cache, filter);
> + probe_cache__commit(cache);
> + probe_cache__delete(cache);
> + }
> + return 0;
> +}
> +
> static int perf_del_probe_events(struct strfilter *filter)
> {
> int ret, ret2, ufd = -1, kfd = -1;
> @@ -375,6 +399,9 @@ static int perf_del_probe_events(struct strfilter *filter)
>
> pr_debug("Delete filter: \'%s\'\n", str);
>
> + if (probe_conf.cache)
> + return del_perf_probe_caches(filter);
> +
> /* Get current event names */
> ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
> if (ret < 0)
> diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
> index a6d4a67..f687607 100644
> --- a/tools/perf/util/probe-file.c
> +++ b/tools/perf/util/probe-file.c
> @@ -660,19 +660,39 @@ out:
> return ret;
> }
>
> +static bool probe_cache_entry__compare(struct probe_cache_entry *entry,
> + struct strfilter *filter)
> +{
> + char buf[128], *ptr = entry->spev;
> +
> + if (entry->pev.event) {
> + snprintf(buf, 128, "%s:%s", entry->pev.group, entry->pev.event);
> + ptr = buf;
> + }
> + return strfilter__compare(filter, ptr);
> +}
> +
> +int probe_cache__remove_entries(struct probe_cache *pcache,
> + struct strfilter *filter)
> +{
> + struct probe_cache_entry *entry, *tmp;
> +
> + list_for_each_entry_safe(entry, tmp, &pcache->list, list) {
so here you used the preferred idiom, i.e. using
list_for_each_entry_safe(), once you stop doing the list removal at the
list entry destructor, it gets the good old boring usual idiom, please
do that.
Also please consider renaming perf_cache__remove_entries() to
perf_cache__filter_purge(), as it doesn't simply remove entries, it
purges them (that is, remove an entry and delete it), and only if the
entry got filtered.
> + if (probe_cache_entry__compare(entry, filter)) {
> + pr_info("Removed cached event: %s\n", entry->spev);
> + probe_cache_entry__delete(entry);
> + }
> + }
> + return 0;
> +}
> +
> static int probe_cache__show_entries(struct probe_cache *pcache,
> struct strfilter *filter)
> {
> struct probe_cache_entry *entry;
> - char buf[128], *ptr;
>
> list_for_each_entry(entry, &pcache->list, list) {
> - if (entry->pev.event) {
> - ptr = buf;
> - snprintf(buf, 128, "%s:%s", entry->pev.group, entry->pev.event);
> - } else
> - ptr = entry->spev;
> - if (strfilter__compare(filter, ptr))
> + if (probe_cache_entry__compare(entry, filter))
> printf("%s\n", entry->spev);
> }
> return 0;
> diff --git a/tools/perf/util/probe-file.h b/tools/perf/util/probe-file.h
> index ac70446..e6fd9b9 100644
> --- a/tools/perf/util/probe-file.h
> +++ b/tools/perf/util/probe-file.h
> @@ -37,6 +37,8 @@ int probe_cache__add_entry(struct probe_cache *pcache,
> struct probe_trace_event *tevs, int ntevs);
> int probe_cache__commit(struct probe_cache *pcache);
> void probe_cache__delete(struct probe_cache *pcache);
> +int probe_cache__remove_entries(struct probe_cache *pcache,
> + struct strfilter *filter);
> struct probe_cache_entry *probe_cache__find(struct probe_cache *pcache,
> struct perf_probe_event *pev);
> struct probe_cache_entry *probe_cache__find_by_name(struct probe_cache *pcache,
[toc] | [prev] | [next] | [standalone]
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-06-11 03:20 +0200 |
| Subject | Re: [PATCH perf/core v10 10/23] perf probe: Remove caches when --cache is given |
| Message-ID | <rIFKF-4QS-3@gated-at.bofh.it> |
| In reply to | #1418380 |
On Thu, 9 Jun 2016 11:28:28 -0300
Arnaldo Carvalho de Melo <acme@kernel.org> wrote:
> > diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
> > index a6d4a67..f687607 100644
> > --- a/tools/perf/util/probe-file.c
> > +++ b/tools/perf/util/probe-file.c
> > @@ -660,19 +660,39 @@ out:
> > return ret;
> > }
> >
> > +static bool probe_cache_entry__compare(struct probe_cache_entry *entry,
> > + struct strfilter *filter)
> > +{
> > + char buf[128], *ptr = entry->spev;
> > +
> > + if (entry->pev.event) {
> > + snprintf(buf, 128, "%s:%s", entry->pev.group, entry->pev.event);
> > + ptr = buf;
> > + }
> > + return strfilter__compare(filter, ptr);
> > +}
> > +
> > +int probe_cache__remove_entries(struct probe_cache *pcache,
> > + struct strfilter *filter)
> > +{
> > + struct probe_cache_entry *entry, *tmp;
> > +
> > + list_for_each_entry_safe(entry, tmp, &pcache->list, list) {
>
> so here you used the preferred idiom, i.e. using
> list_for_each_entry_safe(), once you stop doing the list removal at the
> list entry destructor, it gets the good old boring usual idiom, please
> do that.
OK, I see.
>
> Also please consider renaming perf_cache__remove_entries() to
> perf_cache__filter_purge(), as it doesn't simply remove entries, it
> purges them (that is, remove an entry and delete it), and only if the
> entry got filtered.
OK, such advice about naming helps me a lot :)
Thank you!
--
Masami Hiramatsu <mhiramat@kernel.org>
[toc] | [prev] | [next] | [standalone]
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-06-08 11:40 +0200 |
| Subject | [PATCH perf/core v10 09/23] perf probe: Show all cached probes |
| Message-ID | <rHI7U-6Pu-25@gated-at.bofh.it> |
| In reply to | #1417162 |
From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
perf probe --list shows all cached probes when --cache
is given. Each caches are shown with on which binary that
probed. e.g.
-----
# perf probe --cache vfs_read \$params
# perf probe --cache -x /lib64/libc-2.17.so getaddrinfo \$params
# perf probe --cache --list
[kernel.kallsyms] (1466a0a250b5d0070c6d0f03c5fed30b237970a1):
vfs_read $params
/usr/lib64/libc-2.17.so (c31ffe7942bfd77b2fca8f9bd5709d387a86d3bc):
getaddrinfo $params
-----
Note that $params requires debuginfo.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
Changes in v7:
- Remove the top '/' from binary name if it is not a regular file.
---
tools/perf/Documentation/perf-probe.txt | 8 ++-
tools/perf/builtin-probe.c | 2 -
tools/perf/util/build-id.c | 86 ++++++++++++++++++++++++++++++-
tools/perf/util/build-id.h | 3 +
tools/perf/util/probe-event.c | 3 +
tools/perf/util/probe-file.c | 67 +++++++++++++++++++++++-
tools/perf/util/probe-file.h | 1
7 files changed, 163 insertions(+), 7 deletions(-)
diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt
index 947db6f..5a70d45 100644
--- a/tools/perf/Documentation/perf-probe.txt
+++ b/tools/perf/Documentation/perf-probe.txt
@@ -67,7 +67,10 @@ OPTIONS
-l::
--list[=[GROUP:]EVENT]::
- List up current probe events. This can also accept filtering patterns of event names.
+ List up current probe events. This can also accept filtering patterns of
+ event names.
+ When this is used with --cache, perf shows all cached probes instead of
+ the live probes.
-L::
--line=::
@@ -110,8 +113,9 @@ OPTIONS
adding and removal operations.
--cache::
- Cache the probes (with --add option). Any events which successfully added
+ (With --add) Cache the probes. Any events which successfully added
are also stored in the cache file.
+ (With --list) Show cached probes.
--max-probes=NUM::
Set the maximum number of probe points for an event. Default is 128.
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 6d7ab431..53e380c0e 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -44,7 +44,7 @@
#define DEFAULT_VAR_FILTER "!__k???tab_* & !__crc_*"
#define DEFAULT_FUNC_FILTER "!_*"
-#define DEFAULT_LIST_FILTER "*:*"
+#define DEFAULT_LIST_FILTER "*"
/* Session management structure */
static struct {
diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index ccf0d0d..14fbd37 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -168,8 +168,7 @@ retry:
return NULL;
}
-static char *build_id_cache__linkname(const char *sbuild_id, char *bf,
- size_t size)
+char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size)
{
char *tmp = bf;
int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
@@ -179,6 +178,36 @@ static char *build_id_cache__linkname(const char *sbuild_id, char *bf,
return bf;
}
+char *build_id_cache__origname(const char *sbuild_id)
+{
+ char *linkname;
+ char buf[PATH_MAX];
+ char *ret = NULL, *p;
+ size_t offs = 5; /* == strlen("../..") */
+
+ linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
+ if (!linkname)
+ return NULL;
+
+ if (readlink(linkname, buf, PATH_MAX) < 0)
+ goto out;
+ /* The link should be "../..<origpath>/<sbuild_id>" */
+ p = strrchr(buf, '/'); /* Cut off the "/<sbuild_id>" */
+ if (p && (p > buf + offs)) {
+ *p = '\0';
+ if (buf[offs + 1] == '[')
+ offs++; /*
+ * This is a DSO name, like [kernel.kallsyms].
+ * Skip the first '/', since this is not the
+ * cache of a regular file.
+ */
+ ret = strdup(buf + offs); /* Skip "../..[/]" */
+ }
+out:
+ free(linkname);
+ return ret;
+}
+
static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso)
{
return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : "elf");
@@ -390,6 +419,59 @@ void disable_buildid_cache(void)
no_buildid_cache = true;
}
+int build_id_cache__list_all(struct strlist **result)
+{
+ struct strlist *toplist, *list, *bidlist;
+ struct str_node *nd, *nd2;
+ char *topdir, *linkdir;
+ char sbuild_id[SBUILD_ID_SIZE];
+ int ret = 0;
+
+ /* Open the top-level directory */
+ if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0)
+ return -errno;
+ toplist = lsdir(topdir, lsdir_no_dot_filter);
+ if (!toplist) {
+ pr_debug("Failed to opendir %s\n", topdir);
+ ret = -errno;
+ goto out;
+ }
+ bidlist = strlist__new(NULL, NULL);
+ strlist__for_each(nd, toplist) {
+ if (asprintf(&linkdir, "%s/%s", topdir, nd->s) < 0) {
+ ret = -errno;
+ goto out;
+ }
+ /* Open the lower-level directory */
+ list = lsdir(linkdir, lsdir_no_dot_filter);
+ if (!list) {
+ pr_debug("Failed to open %s: %d\n", linkdir, -errno);
+ goto next;
+ }
+ strlist__for_each(nd2, list) {
+ ret = snprintf(sbuild_id, SBUILD_ID_SIZE, "%s%s",
+ nd->s, nd2->s);
+ if (ret != SBUILD_ID_SIZE - 1) {
+ pr_debug("%s/%s is not buildid cache\n",
+ nd->s, nd2->s);
+ continue;
+ }
+ strlist__add(bidlist, sbuild_id);
+ }
+ strlist__delete(list);
+next:
+ free(linkdir);
+ }
+
+ *result = bidlist;
+out:
+ if (toplist)
+ strlist__delete(toplist);
+ free(topdir);
+
+ return ret;
+}
+
char *build_id_cache__cachedir(const char *sbuild_id, const char *name,
bool is_kallsyms, bool is_vdso)
{
diff --git a/tools/perf/util/build-id.h b/tools/perf/util/build-id.h
index d8c7f2f..c05503e 100644
--- a/tools/perf/util/build-id.h
+++ b/tools/perf/util/build-id.h
@@ -30,8 +30,11 @@ bool perf_session__read_build_ids(struct perf_session *session, bool with_hits);
int perf_session__write_buildid_table(struct perf_session *session, int fd);
int perf_session__cache_build_ids(struct perf_session *session);
+char *build_id_cache__origname(const char *sbuild_id);
+char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size);
char *build_id_cache__cachedir(const char *sbuild_id, const char *name,
bool is_kallsyms, bool is_vdso);
+int build_id_cache__list_all(struct strlist **result);
int build_id_cache__list_build_ids(const char *pathname,
struct strlist **result);
bool build_id_cache__cached(const char *sbuild_id);
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index d8e5004..6a55fa3 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2368,6 +2368,9 @@ int show_perf_probe_events(struct strfilter *filter)
setup_pager();
+ if (probe_conf.cache)
+ return probe_cache__show_all_caches(filter);
+
ret = init_probe_symbol_maps(false);
if (ret < 0)
return ret;
diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
index f30f609..a6d4a67 100644
--- a/tools/perf/util/probe-file.c
+++ b/tools/perf/util/probe-file.c
@@ -365,10 +365,17 @@ static int probe_cache__open(struct probe_cache *pcache, const char *target)
{
char cpath[PATH_MAX];
char sbuildid[SBUILD_ID_SIZE];
- char *dir_name;
+ char *dir_name = NULL;
bool is_kallsyms = !target;
int ret, fd;
+ if (target && build_id_cache__cached(target)) {
+ /* This is a cached buildid */
+ strncpy(sbuildid, target, SBUILD_ID_SIZE);
+ dir_name = build_id_cache__linkname(sbuildid, NULL, 0);
+ goto found;
+ }
+
if (target)
ret = filename__sprintf_build_id(target, sbuildid);
else {
@@ -392,8 +399,11 @@ static int probe_cache__open(struct probe_cache *pcache, const char *target)
dir_name = build_id_cache__cachedir(sbuildid, target, is_kallsyms,
false);
- if (!dir_name)
+found:
+ if (!dir_name) {
+ pr_debug("Failed to get cache from %s\n", target);
return -ENOMEM;
+ }
snprintf(cpath, PATH_MAX, "%s/probes", dir_name);
fd = open(cpath, O_CREAT | O_RDWR, 0644);
@@ -649,3 +659,56 @@ int probe_cache__commit(struct probe_cache *pcache)
out:
return ret;
}
+
+static int probe_cache__show_entries(struct probe_cache *pcache,
+ struct strfilter *filter)
+{
+ struct probe_cache_entry *entry;
+ char buf[128], *ptr;
+
+ list_for_each_entry(entry, &pcache->list, list) {
+ if (entry->pev.event) {
+ ptr = buf;
+ snprintf(buf, 128, "%s:%s", entry->pev.group, entry->pev.event);
+ } else
+ ptr = entry->spev;
+ if (strfilter__compare(filter, ptr))
+ printf("%s\n", entry->spev);
+ }
+ return 0;
+}
+
+/* Show all cached probes */
+int probe_cache__show_all_caches(struct strfilter *filter)
+{
+ struct probe_cache *pcache;
+ struct strlist *bidlist;
+ struct str_node *nd;
+ char *buf;
+ int ret;
+
+ buf = strfilter__string(filter);
+ pr_debug("list cache with filter: %s\n", buf);
+ free(buf);
+
+ ret = build_id_cache__list_all(&bidlist);
+ if (ret < 0) {
+ pr_debug("Failed to get buildids: %d\n", ret);
+ return ret == -ENOENT ? 0 : ret;
+ }
+ strlist__for_each(nd, bidlist) {
+ pcache = probe_cache__new(nd->s);
+ if (!pcache)
+ continue;
+ if (!list_empty(&pcache->list)) {
+ buf = build_id_cache__origname(nd->s);
+ printf("%s (%s):\n", buf, nd->s);
+ free(buf);
+ probe_cache__show_entries(pcache, filter);
+ }
+ probe_cache__delete(pcache);
+ }
+ strlist__delete(bidlist);
+
+ return 0;
+}
diff --git a/tools/perf/util/probe-file.h b/tools/perf/util/probe-file.h
index 1385c8b..ac70446 100644
--- a/tools/perf/util/probe-file.h
+++ b/tools/perf/util/probe-file.h
@@ -41,4 +41,5 @@ struct probe_cache_entry *probe_cache__find(struct probe_cache *pcache,
struct perf_probe_event *pev);
struct probe_cache_entry *probe_cache__find_by_name(struct probe_cache *pcache,
const char *group, const char *event);
+int probe_cache__show_all_caches(struct strfilter *filter);
#endif
[toc] | [prev] | [next] | [standalone]
| From | Arnaldo Carvalho de Melo <acme@kernel.org> |
|---|---|
| Date | 2016-06-09 16:30 +0200 |
| Subject | Re: [PATCH perf/core v10 09/23] perf probe: Show all cached probes |
| Message-ID | <rI986-7ym-27@gated-at.bofh.it> |
| In reply to | #1417173 |
Em Wed, Jun 08, 2016 at 06:30:30PM +0900, Masami Hiramatsu escreveu:
> +char *build_id_cache__origname(const char *sbuild_id)
> +{
> + char *linkname;
> + char buf[PATH_MAX];
> + char *ret = NULL, *p;
> + size_t offs = 5; /* == strlen("../..") */
> +
> + linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
> + if (!linkname)
> + return NULL;
> +
> + if (readlink(linkname, buf, PATH_MAX) < 0)
> + goto out;
> + /* The link should be "../..<origpath>/<sbuild_id>" */
> + p = strrchr(buf, '/'); /* Cut off the "/<sbuild_id>" */
> + if (p && (p > buf + offs)) {
> + *p = '\0';
> + if (buf[offs + 1] == '[')
> + offs++; /*
> + * This is a DSO name, like [kernel.kallsyms].
> + * Skip the first '/', since this is not the
> + * cache of a regular file.
> + */
> + ret = strdup(buf + offs); /* Skip "../..[/]" */
strdup can fail.
> + }
> +out:
> + free(linkname);
> + return ret;
> +}
> +
> static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso)
> {
> return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : "elf");
> @@ -390,6 +419,59 @@ void disable_buildid_cache(void)
> no_buildid_cache = true;
> }
>
> +int build_id_cache__list_all(struct strlist **result)
> +{
> + struct strlist *toplist, *list, *bidlist;
> + struct str_node *nd, *nd2;
> + char *topdir, *linkdir;
> + char sbuild_id[SBUILD_ID_SIZE];
> + int ret = 0;
> +
> + /* Open the top-level directory */
> + if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0)
> + return -errno;
Wouldn't be better to just return -1 and leave the caller to look at
errno? I know that there is code that does that, but better stick to the
errno convention?
> + toplist = lsdir(topdir, lsdir_no_dot_filter);
> + if (!toplist) {
> + pr_debug("Failed to opendir %s\n", topdir);
> + ret = -errno;
ditto
> + goto out;
> + }
> + bidlist = strlist__new(NULL, NULL);
> + strlist__for_each(nd, toplist) {
> + if (asprintf(&linkdir, "%s/%s", topdir, nd->s) < 0) {
> + ret = -errno;
> + goto out;
> + }
> + /* Open the lower-level directory */
> + list = lsdir(linkdir, lsdir_no_dot_filter);
> + if (!list) {
> + pr_debug("Failed to open %s: %d\n", linkdir, -errno);
> + goto next;
> + }
> + strlist__for_each(nd2, list) {
> + ret = snprintf(sbuild_id, SBUILD_ID_SIZE, "%s%s",
> + nd->s, nd2->s);
> + if (ret != SBUILD_ID_SIZE - 1) {
> + pr_debug("%s/%s is not buildid cache\n",
> + nd->s, nd2->s);
> + continue;
> + }
> + strlist__add(bidlist, sbuild_id);
strlist__add() can fail, please check its result.
> + }
> + strlist__delete(list);
> +next:
> + free(linkdir);
> + }
> +
> + *result = bidlist;
> +out:
> + if (toplist)
> + strlist__delete(toplist);
No need for checking toplist.
> + free(topdir);
> +
> + return ret;
> +}
<SNIP>
- Arnaldo
[toc] | [prev] | [next] | [standalone]
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-06-11 02:30 +0200 |
| Subject | Re: [PATCH perf/core v10 09/23] perf probe: Show all cached probes |
| Message-ID | <rIEYh-4io-13@gated-at.bofh.it> |
| In reply to | #1418382 |
On Thu, 9 Jun 2016 11:22:55 -0300
Arnaldo Carvalho de Melo <acme@kernel.org> wrote:
> Em Wed, Jun 08, 2016 at 06:30:30PM +0900, Masami Hiramatsu escreveu:
> > +char *build_id_cache__origname(const char *sbuild_id)
> > +{
> > + char *linkname;
> > + char buf[PATH_MAX];
> > + char *ret = NULL, *p;
> > + size_t offs = 5; /* == strlen("../..") */
> > +
> > + linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
> > + if (!linkname)
> > + return NULL;
> > +
> > + if (readlink(linkname, buf, PATH_MAX) < 0)
> > + goto out;
> > + /* The link should be "../..<origpath>/<sbuild_id>" */
> > + p = strrchr(buf, '/'); /* Cut off the "/<sbuild_id>" */
> > + if (p && (p > buf + offs)) {
> > + *p = '\0';
> > + if (buf[offs + 1] == '[')
> > + offs++; /*
> > + * This is a DSO name, like [kernel.kallsyms].
> > + * Skip the first '/', since this is not the
> > + * cache of a regular file.
> > + */
> > + ret = strdup(buf + offs); /* Skip "../..[/]" */
>
> strdup can fail.
Ah, right.
>
> > + }
> > +out:
> > + free(linkname);
> > + return ret;
> > +}
> > +
> > static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso)
> > {
> > return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : "elf");
> > @@ -390,6 +419,59 @@ void disable_buildid_cache(void)
> > no_buildid_cache = true;
> > }
> >
> > +int build_id_cache__list_all(struct strlist **result)
> > +{
> > + struct strlist *toplist, *list, *bidlist;
> > + struct str_node *nd, *nd2;
> > + char *topdir, *linkdir;
> > + char sbuild_id[SBUILD_ID_SIZE];
> > + int ret = 0;
> > +
> > + /* Open the top-level directory */
> > + if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0)
> > + return -errno;
>
> Wouldn't be better to just return -1 and leave the caller to look at
> errno? I know that there is code that does that, but better stick to the
> errno convention?
Hmm, IMHO, that may depends on case. This case is possible,
but in below case, pr_debug() also calls libc function and
it can override the errno. This can also happen when we run
some cleanup code before returning.
So, I think it will be good for enough small functions, but
not good for complex bigger functions.
From the viewpoint of debugging, maybe it is also possible
to return -N, where N is based on the place where the error
happens :)
> > + toplist = lsdir(topdir, lsdir_no_dot_filter);
> > + if (!toplist) {
> > + pr_debug("Failed to opendir %s\n", topdir);
> > + ret = -errno;
>
> ditto
>
> > + goto out;
> > + }
> > + bidlist = strlist__new(NULL, NULL);
> > + strlist__for_each(nd, toplist) {
> > + if (asprintf(&linkdir, "%s/%s", topdir, nd->s) < 0) {
> > + ret = -errno;
> > + goto out;
> > + }
> > + /* Open the lower-level directory */
> > + list = lsdir(linkdir, lsdir_no_dot_filter);
> > + if (!list) {
> > + pr_debug("Failed to open %s: %d\n", linkdir, -errno);
> > + goto next;
> > + }
> > + strlist__for_each(nd2, list) {
> > + ret = snprintf(sbuild_id, SBUILD_ID_SIZE, "%s%s",
> > + nd->s, nd2->s);
> > + if (ret != SBUILD_ID_SIZE - 1) {
> > + pr_debug("%s/%s is not buildid cache\n",
> > + nd->s, nd2->s);
> > + continue;
> > + }
> > + strlist__add(bidlist, sbuild_id);
>
> strlist__add() can fail, please check its result.
Ah, I forgot to update that...
>
> > + }
> > + strlist__delete(list);
> > +next:
> > + free(linkdir);
> > + }
> > +
> > + *result = bidlist;
> > +out:
> > + if (toplist)
> > + strlist__delete(toplist);
>
> No need for checking toplist.
OK.
>
> > + free(topdir);
> > +
> > + return ret;
> > +}
>
> <SNIP>
>
> - Arnaldo
Thank you!
--
Masami Hiramatsu <mhiramat@kernel.org>
[toc] | [prev] | [next] | [standalone]
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-06-08 11:40 +0200 |
| Subject | [PATCH perf/core v10 08/23] perf probe: Use cache entry if possible |
| Message-ID | <rHI7U-6Pu-27@gated-at.bofh.it> |
| In reply to | #1417162 |
From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Before analyzing debuginfo, try to find a corresponding entry
from probe cache always. This does not depend on --cache,
the --cache enables to store/update cache, but looking up
the cache is always enabled.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
Changes in v6:
- Remove fallback lookup routine by using function name
as cached event name, because it should be done by following
patch which supports %cached-event.
---
tools/perf/util/probe-event.c | 65 ++++++++++++++++++++++++++++++++++++++++-
tools/perf/util/probe-file.c | 20 ++++++++++++-
tools/perf/util/probe-file.h | 5 +++
3 files changed, 86 insertions(+), 4 deletions(-)
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 7cfd1fa..d8e5004 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2476,17 +2476,24 @@ static int probe_trace_event__set_name(struct probe_trace_event *tev,
char buf[64];
int ret;
+ /* If probe_event or trace_event already have the name, reuse it */
if (pev->event)
event = pev->event;
- else
+ else if (tev->event)
+ event = tev->event;
+ else {
+ /* Or generate new one from probe point */
if (pev->point.function &&
(strncmp(pev->point.function, "0x", 2) != 0) &&
!strisglob(pev->point.function))
event = pev->point.function;
else
event = tev->point.realname;
+ }
if (pev->group)
group = pev->group;
+ else if (tev->group)
+ group = tev->group;
else
group = PERFPROBE_GROUP;
@@ -2533,7 +2540,7 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
for (i = 0; i < ntevs; i++) {
tev = &tevs[i];
/* Skip if the symbol is out of .text or blacklisted */
- if (!tev->point.symbol)
+ if (!tev->point.symbol && !pev->uprobes)
continue;
/* Set new name for tev (and update namelist) */
@@ -2846,6 +2853,55 @@ errout:
bool __weak arch__prefers_symtab(void) { return false; }
+static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,
+ struct probe_trace_event **tevs)
+{
+ struct probe_cache *cache;
+ struct probe_cache_entry *entry;
+ struct probe_trace_event *tev;
+ struct str_node *node;
+ int ret, i;
+
+ cache = probe_cache__new(pev->target);
+ if (!cache)
+ return 0;
+
+ entry = probe_cache__find(cache, pev);
+ if (!entry) {
+ ret = 0;
+ goto out;
+ }
+
+ ret = strlist__nr_entries(entry->tevlist);
+ if (ret > probe_conf.max_probes) {
+ pr_debug("Too many entries matched in the cache of %s\n",
+ pev->target ? : "kernel");
+ ret = -E2BIG;
+ goto out;
+ }
+
+ *tevs = zalloc(ret * sizeof(*tev));
+ if (!*tevs) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ i = 0;
+ strlist__for_each(node, entry->tevlist) {
+ tev = &(*tevs)[i++];
+ ret = parse_probe_trace_command(node->s, tev);
+ if (ret < 0)
+ goto out;
+ /* Set the uprobes attribute as same as original */
+ tev->uprobes = pev->uprobes;
+ }
+ ret = i;
+
+out:
+ probe_cache__delete(cache);
+ return ret;
+}
+
static int convert_to_probe_trace_events(struct perf_probe_event *pev,
struct probe_trace_event **tevs)
{
@@ -2868,6 +2924,11 @@ static int convert_to_probe_trace_events(struct perf_probe_event *pev,
if (ret > 0)
return ret;
+ /* At first, we need to lookup cache entry */
+ ret = find_probe_trace_events_from_cache(pev, tevs);
+ if (ret > 0)
+ return ret; /* Found in probe cache */
+
if (arch__prefers_symtab() && !perf_probe_event_need_dwarf(pev)) {
ret = find_probe_trace_events_from_map(pev, tevs);
if (ret > 0)
diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
index 689d874..f30f609 100644
--- a/tools/perf/util/probe-file.c
+++ b/tools/perf/util/probe-file.c
@@ -514,7 +514,7 @@ static bool streql(const char *a, const char *b)
return !strcmp(a, b);
}
-static struct probe_cache_entry *
+struct probe_cache_entry *
probe_cache__find(struct probe_cache *pcache, struct perf_probe_event *pev)
{
struct probe_cache_entry *entry = NULL;
@@ -539,6 +539,24 @@ found:
return entry;
}
+struct probe_cache_entry *
+probe_cache__find_by_name(struct probe_cache *pcache,
+ const char *group, const char *event)
+{
+ struct probe_cache_entry *entry = NULL;
+
+ list_for_each_entry(entry, &pcache->list, list) {
+ /* Hit if same event name or same command-string */
+ if (streql(entry->pev.group, group) &&
+ streql(entry->pev.event, event))
+ goto found;
+ }
+ entry = NULL;
+
+found:
+ return entry;
+}
+
int probe_cache__add_entry(struct probe_cache *pcache,
struct perf_probe_event *pev,
struct probe_trace_event *tevs, int ntevs)
diff --git a/tools/perf/util/probe-file.h b/tools/perf/util/probe-file.h
index d2b8791d..1385c8b 100644
--- a/tools/perf/util/probe-file.h
+++ b/tools/perf/util/probe-file.h
@@ -37,5 +37,8 @@ int probe_cache__add_entry(struct probe_cache *pcache,
struct probe_trace_event *tevs, int ntevs);
int probe_cache__commit(struct probe_cache *pcache);
void probe_cache__delete(struct probe_cache *pcache);
-
+struct probe_cache_entry *probe_cache__find(struct probe_cache *pcache,
+ struct perf_probe_event *pev);
+struct probe_cache_entry *probe_cache__find_by_name(struct probe_cache *pcache,
+ const char *group, const char *event);
#endif
[toc] | [prev] | [next] | [standalone]
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-06-08 11:40 +0200 |
| Subject | [PATCH perf/core v10 12/23] perf probe: Add group name support |
| Message-ID | <rHI7U-6Pu-33@gated-at.bofh.it> |
| In reply to | #1417162 |
From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Allow user to set group name for adding new event.
Note that user must ensure that the group name doesn't
conflict with existing group name carefully.
E.g. Existing group name can conflict with other events.
Especially, using the group name reserved for kernel
modules can hide kernel embedded events when loading
modules.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
Changes in v4:
- Update Documentation/perf-probe.txt too.
---
tools/perf/Documentation/perf-probe.txt | 10 ++++++----
tools/perf/util/probe-event.c | 23 ++++++++++++++---------
2 files changed, 20 insertions(+), 13 deletions(-)
diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt
index 8d09173..7a258e9 100644
--- a/tools/perf/Documentation/perf-probe.txt
+++ b/tools/perf/Documentation/perf-probe.txt
@@ -143,16 +143,18 @@ PROBE SYNTAX
Probe points are defined by following syntax.
1) Define event based on function name
- [EVENT=]FUNC[@SRC][:RLN|+OFFS|%return|;PTN] [ARG ...]
+ [[GROUP:]EVENT=]FUNC[@SRC][:RLN|+OFFS|%return|;PTN] [ARG ...]
2) Define event based on source file with line number
- [EVENT=]SRC:ALN [ARG ...]
+ [[GROUP:]EVENT=]SRC:ALN [ARG ...]
3) Define event based on source file with lazy pattern
- [EVENT=]SRC;PTN [ARG ...]
+ [[GROUP:]EVENT=]SRC;PTN [ARG ...]
-'EVENT' specifies the name of new event, if omitted, it will be set the name of the probed function. Currently, event group name is set as 'probe'.
+'EVENT' specifies the name of new event, if omitted, it will be set the name of the probed function. You can also specify a group name by 'GROUP', if omitted, set 'probe' is used for kprobe and 'probe_<bin>' is used for uprobe.
+Note that using existing group name can conflict with other events. Especially, using the group name reserved for kernel modules can hide embedded events in the
+modules.
'FUNC' specifies a probed function name, and it may have one of the following options; '+OFFS' is the offset from function entry address in bytes, ':RLN' is the relative-line number from function entry line, and '%return' means that it probes function return. And ';PTN' means lazy matching pattern (see LAZY MATCHING). Note that ';PTN' must be the end of the probe point definition. In addition, '@SRC' specifies a source file which has that function.
It is also possible to specify a probe point by the source line number or lazy matching by using 'SRC:ALN' or 'SRC;PTN' syntax, where 'SRC' is the source file path, ':ALN' is the line number and ';PTN' is the lazy matching pattern.
'ARG' specifies the arguments of this probe point, (see PROBE ARGUMENT).
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 6a55fa3..2178d26 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1208,10 +1208,8 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
bool file_spec = false;
/*
* <Syntax>
- * perf probe [EVENT=]SRC[:LN|;PTN]
- * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
- *
- * TODO:Group name support
+ * perf probe [GRP:][EVENT=]SRC[:LN|;PTN]
+ * perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
*/
if (!arg)
return -EINVAL;
@@ -1220,11 +1218,19 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
if (ptr && *ptr == '=') { /* Event name */
*ptr = '\0';
tmp = ptr + 1;
- if (strchr(arg, ':')) {
- semantic_error("Group name is not supported yet.\n");
- return -ENOTSUP;
- }
+ ptr = strchr(arg, ':');
+ if (ptr) {
+ *ptr = '\0';
+ if (!is_c_func_name(arg))
+ goto not_fname;
+ pev->group = strdup(arg);
+ if (!pev->group)
+ return -ENOMEM;
+ arg = ptr + 1;
+ } else
+ pev->group = NULL;
if (!is_c_func_name(arg)) {
+not_fname:
semantic_error("%s is bad for event name -it must "
"follow C symbol-naming rule.\n", arg);
return -EINVAL;
@@ -1232,7 +1238,6 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
pev->event = strdup(arg);
if (pev->event == NULL)
return -ENOMEM;
- pev->group = NULL;
arg = tmp;
}
[toc] | [prev] | [next] | [standalone]
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-06-08 11:40 +0200 |
| Subject | [PATCH perf/core v10 11/23] perf/sdt: ELF support for SDT |
| Message-ID | <rHI7U-6Pu-37@gated-at.bofh.it> |
| In reply to | #1417162 |
From: Hemant Kumar <hemant@linux.vnet.ibm.com>
This patch serves the initial support to identify and list SDT events in binaries.
When programs containing SDT markers are compiled, gcc with the help of assembler
directives identifies them and places them in the section ".note.stapsdt". To find
these markers from the binaries, one needs to traverse through this section and
parse the relevant details like the name, type and location of the marker. Also,
the original location could be skewed due to the effect of prelinking. If that is
the case, the locations need to be adjusted.
The functions in this patch open a given ELF, find out the SDT section, parse the
relevant details, adjust the location (if necessary) and populate them in a list.
A typical note entry in ".note.stapsdt" section is as follows :
|--nhdr.n_namesz--|
------------------------------------
| nhdr | "stapsdt" |
----- |----------------------------------|
| | <location> <base_address> |
| | <semaphore> |
nhdr.n_descsize | "provider_name" "note_name" |
| | <args> |
----- |----------------------------------|
| nhdr | "stapsdt" |
|...
The above shows an excerpt from the section ".note.stapsdt".
'nhdr' is a structure which has the note name size (n_namesz), note
description size (n_desc_sz) and note type (n_type). So, in order to
parse the note note info, we need nhdr to tell us where to start from.
As can be seen from <sys/sdt.h>, the name of the SDT notes given is "stapsdt".
But this is not the identifier of the note.
After that, we go to description of the note to find out its location, the
address of the ".stapsdt.base" section and the semaphore address.
Then, we find the provider name and the SDT marker name and then follow the
arguments.
Signed-off-by: Hemant Kumar <hemant@linux.vnet.ibm.com>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/util/symbol-elf.c | 252 ++++++++++++++++++++++++++++++++++++++++++
tools/perf/util/symbol.h | 22 ++++
2 files changed, 274 insertions(+)
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 87a297d..e74ce17 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -1781,6 +1781,258 @@ void kcore_extract__delete(struct kcore_extract *kce)
unlink(kce->extract_filename);
}
+/**
+ * populate_sdt_note : Parse raw data and identify SDT note
+ * @elf: elf of the opened file
+ * @data: raw data of a section with description offset applied
+ * @len: note description size
+ * @type: type of the note
+ * @sdt_notes: List to add the SDT note
+ *
+ * Responsible for parsing the @data in section .note.stapsdt in @elf and
+ * if its an SDT note, it appends to @sdt_notes list.
+ */
+static int populate_sdt_note(Elf **elf, const char *data, size_t len,
+ struct list_head *sdt_notes)
+{
+ const char *provider, *name;
+ struct sdt_note *tmp = NULL;
+ GElf_Ehdr ehdr;
+ GElf_Addr base_off = 0;
+ GElf_Shdr shdr;
+ int ret = -EINVAL;
+
+ union {
+ Elf64_Addr a64[NR_ADDR];
+ Elf32_Addr a32[NR_ADDR];
+ } buf;
+
+ Elf_Data dst = {
+ .d_buf = &buf, .d_type = ELF_T_ADDR, .d_version = EV_CURRENT,
+ .d_size = gelf_fsize((*elf), ELF_T_ADDR, NR_ADDR, EV_CURRENT),
+ .d_off = 0, .d_align = 0
+ };
+ Elf_Data src = {
+ .d_buf = (void *) data, .d_type = ELF_T_ADDR,
+ .d_version = EV_CURRENT, .d_size = dst.d_size, .d_off = 0,
+ .d_align = 0
+ };
+
+ tmp = (struct sdt_note *)calloc(1, sizeof(struct sdt_note));
+ if (!tmp) {
+ ret = -ENOMEM;
+ goto out_err;
+ }
+
+ INIT_LIST_HEAD(&tmp->note_list);
+
+ if (len < dst.d_size + 3)
+ goto out_free_note;
+
+ /* Translation from file representation to memory representation */
+ if (gelf_xlatetom(*elf, &dst, &src,
+ elf_getident(*elf, NULL)[EI_DATA]) == NULL) {
+ pr_err("gelf_xlatetom : %s\n", elf_errmsg(-1));
+ goto out_free_note;
+ }
+
+ /* Populate the fields of sdt_note */
+ provider = data + dst.d_size;
+
+ name = (const char *)memchr(provider, '\0', data + len - provider);
+ if (name++ == NULL)
+ goto out_free_note;
+
+ tmp->provider = strdup(provider);
+ if (!tmp->provider) {
+ ret = -ENOMEM;
+ goto out_free_note;
+ }
+ tmp->name = strdup(name);
+ if (!tmp->name) {
+ ret = -ENOMEM;
+ goto out_free_prov;
+ }
+
+ if (gelf_getclass(*elf) == ELFCLASS32) {
+ memcpy(&tmp->addr, &buf, 3 * sizeof(Elf32_Addr));
+ tmp->bit32 = true;
+ } else {
+ memcpy(&tmp->addr, &buf, 3 * sizeof(Elf64_Addr));
+ tmp->bit32 = false;
+ }
+
+ if (!gelf_getehdr(*elf, &ehdr)) {
+ pr_debug("%s : cannot get elf header.\n", __func__);
+ ret = -EBADF;
+ goto out_free_name;
+ }
+
+ /* Adjust the prelink effect :
+ * Find out the .stapsdt.base section.
+ * This scn will help us to handle prelinking (if present).
+ * Compare the retrieved file offset of the base section with the
+ * base address in the description of the SDT note. If its different,
+ * then accordingly, adjust the note location.
+ */
+ if (elf_section_by_name(*elf, &ehdr, &shdr, SDT_BASE_SCN, NULL)) {
+ base_off = shdr.sh_offset;
+ if (base_off) {
+ if (tmp->bit32)
+ tmp->addr.a32[0] = tmp->addr.a32[0] + base_off -
+ tmp->addr.a32[1];
+ else
+ tmp->addr.a64[0] = tmp->addr.a64[0] + base_off -
+ tmp->addr.a64[1];
+ }
+ }
+
+ list_add_tail(&tmp->note_list, sdt_notes);
+ return 0;
+
+out_free_name:
+ free(tmp->name);
+out_free_prov:
+ free(tmp->provider);
+out_free_note:
+ free(tmp);
+out_err:
+ return ret;
+}
+
+/**
+ * construct_sdt_notes_list : constructs a list of SDT notes
+ * @elf : elf to look into
+ * @sdt_notes : empty list_head
+ *
+ * Scans the sections in 'elf' for the section
+ * .note.stapsdt. It, then calls populate_sdt_note to find
+ * out the SDT events and populates the 'sdt_notes'.
+ */
+static int construct_sdt_notes_list(Elf *elf, struct list_head *sdt_notes)
+{
+ GElf_Ehdr ehdr;
+ Elf_Scn *scn = NULL;
+ Elf_Data *data;
+ GElf_Shdr shdr;
+ size_t shstrndx, next;
+ GElf_Nhdr nhdr;
+ size_t name_off, desc_off, offset;
+ int ret = 0;
+
+ if (gelf_getehdr(elf, &ehdr) == NULL) {
+ ret = -EBADF;
+ goto out_ret;
+ }
+ if (elf_getshdrstrndx(elf, &shstrndx) != 0) {
+ ret = -EBADF;
+ goto out_ret;
+ }
+
+ /* Look for the required section */
+ scn = elf_section_by_name(elf, &ehdr, &shdr, SDT_NOTE_SCN, NULL);
+ if (!scn) {
+ ret = -ENOENT;
+ goto out_ret;
+ }
+
+ if ((shdr.sh_type != SHT_NOTE) || (shdr.sh_flags & SHF_ALLOC)) {
+ ret = -ENOENT;
+ goto out_ret;
+ }
+
+ data = elf_getdata(scn, NULL);
+
+ /* Get the SDT notes */
+ for (offset = 0; (next = gelf_getnote(data, offset, &nhdr, &name_off,
+ &desc_off)) > 0; offset = next) {
+ if (nhdr.n_namesz == sizeof(SDT_NOTE_NAME) &&
+ !memcmp(data->d_buf + name_off, SDT_NOTE_NAME,
+ sizeof(SDT_NOTE_NAME))) {
+ /* Check the type of the note */
+ if (nhdr.n_type != SDT_NOTE_TYPE)
+ goto out_ret;
+
+ ret = populate_sdt_note(&elf, ((data->d_buf) + desc_off),
+ nhdr.n_descsz, sdt_notes);
+ if (ret < 0)
+ goto out_ret;
+ }
+ }
+ if (list_empty(sdt_notes))
+ ret = -ENOENT;
+
+out_ret:
+ return ret;
+}
+
+/**
+ * get_sdt_note_list : Wrapper to construct a list of sdt notes
+ * @head : empty list_head
+ * @target : file to find SDT notes from
+ *
+ * This opens the file, initializes
+ * the ELF and then calls construct_sdt_notes_list.
+ */
+int get_sdt_note_list(struct list_head *head, const char *target)
+{
+ Elf *elf;
+ int fd, ret;
+
+ fd = open(target, O_RDONLY);
+ if (fd < 0)
+ return -EBADF;
+
+ elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
+ if (!elf) {
+ ret = -EBADF;
+ goto out_close;
+ }
+ ret = construct_sdt_notes_list(elf, head);
+ elf_end(elf);
+out_close:
+ close(fd);
+ return ret;
+}
+
+/**
+ * cleanup_sdt_note_list : free the sdt notes' list
+ * @sdt_notes: sdt notes' list
+ *
+ * Free up the SDT notes in @sdt_notes.
+ * Returns the number of SDT notes free'd.
+ */
+int cleanup_sdt_note_list(struct list_head *sdt_notes)
+{
+ struct sdt_note *tmp, *pos;
+ int nr_free = 0;
+
+ list_for_each_entry_safe(pos, tmp, sdt_notes, note_list) {
+ list_del(&pos->note_list);
+ free(pos->name);
+ free(pos->provider);
+ free(pos);
+ nr_free++;
+ }
+ return nr_free;
+}
+
+/**
+ * sdt_notes__get_count: Counts the number of sdt events
+ * @start: list_head to sdt_notes list
+ *
+ * Returns the number of SDT notes in a list
+ */
+int sdt_notes__get_count(struct list_head *start)
+{
+ struct sdt_note *sdt_ptr;
+ int count = 0;
+
+ list_for_each_entry(sdt_ptr, start, note_list)
+ count++;
+ return count;
+}
+
void symbol__elf_init(void)
{
elf_version(EV_CURRENT);
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index b10d558..699f7cb 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -342,4 +342,26 @@ void arch__sym_update(struct symbol *s, GElf_Sym *sym);
int arch__choose_best_symbol(struct symbol *syma, struct symbol *symb);
+/* structure containing an SDT note's info */
+struct sdt_note {
+ char *name; /* name of the note*/
+ char *provider; /* provider name */
+ bool bit32; /* whether the location is 32 bits? */
+ union { /* location, base and semaphore addrs */
+ Elf64_Addr a64[3];
+ Elf32_Addr a32[3];
+ } addr;
+ struct list_head note_list; /* SDT notes' list */
+};
+
+int get_sdt_note_list(struct list_head *head, const char *target);
+int cleanup_sdt_note_list(struct list_head *sdt_notes);
+int sdt_notes__get_count(struct list_head *start);
+
+#define SDT_BASE_SCN ".stapsdt.base"
+#define SDT_NOTE_SCN ".note.stapsdt"
+#define SDT_NOTE_TYPE 3
+#define SDT_NOTE_NAME "stapsdt"
+#define NR_ADDR 3
+
#endif /* __PERF_SYMBOL */
[toc] | [prev] | [next] | [standalone]
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-06-08 11:40 +0200 |
| Subject | [PATCH perf/core v10 04/23] perf probe: Add perf_probe_event__copy() |
| Message-ID | <rHI7U-6Pu-29@gated-at.bofh.it> |
| In reply to | #1417162 |
Add perf_probe_event__copy() to copy perf_probe_event
data structure and sub data structures under given source
perf_probe_event.
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
Changes in v10:
- Splited from "Add --cache option to cache the probe definitions"
---
tools/perf/util/probe-event.c | 76 +++++++++++++++++++++++++++++++++++++++--
tools/perf/util/probe-event.h | 3 ++
2 files changed, 76 insertions(+), 3 deletions(-)
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 7ae3dd1..84f4b2b3 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2030,6 +2030,79 @@ void clear_perf_probe_event(struct perf_probe_event *pev)
memset(pev, 0, sizeof(*pev));
}
+#define strdup_or_goto(str, label) \
+({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; })
+
+static int perf_probe_point__copy(struct perf_probe_point *dst,
+ struct perf_probe_point *src)
+{
+ dst->file = strdup_or_goto(src->file, out_err);
+ dst->function = strdup_or_goto(src->function, out_err);
+ dst->lazy_line = strdup_or_goto(src->lazy_line, out_err);
+ dst->line = src->line;
+ dst->retprobe = src->retprobe;
+ dst->offset = src->offset;
+ return 0;
+
+out_err:
+ clear_perf_probe_point(dst);
+ return -ENOMEM;
+}
+
+static int perf_probe_arg__copy(struct perf_probe_arg *dst,
+ struct perf_probe_arg *src)
+{
+ struct perf_probe_arg_field *field, **ppfield;
+
+ dst->name = strdup_or_goto(src->name, out_err);
+ dst->var = strdup_or_goto(src->var, out_err);
+ dst->type = strdup_or_goto(src->type, out_err);
+
+ field = src->field;
+ ppfield = &(dst->field);
+ while (field) {
+ *ppfield = zalloc(sizeof(*field));
+ if (!*ppfield)
+ goto out_err;
+ (*ppfield)->name = strdup_or_goto(field->name, out_err);
+ (*ppfield)->index = field->index;
+ (*ppfield)->ref = field->ref;
+ field = field->next;
+ ppfield = &((*ppfield)->next);
+ }
+ return 0;
+out_err:
+ return -ENOMEM;
+}
+
+int perf_probe_event__copy(struct perf_probe_event *dst,
+ struct perf_probe_event *src)
+{
+ int i;
+
+ dst->event = strdup_or_goto(src->event, out_err);
+ dst->group = strdup_or_goto(src->group, out_err);
+ dst->target = strdup_or_goto(src->target, out_err);
+ dst->uprobes = src->uprobes;
+
+ if (perf_probe_point__copy(&dst->point, &src->point) < 0)
+ goto out_err;
+
+ dst->args = zalloc(sizeof(struct perf_probe_arg) * src->nargs);
+ if (!dst->args)
+ goto out_err;
+ dst->nargs = src->nargs;
+
+ for (i = 0; i < src->nargs; i++)
+ if (perf_probe_arg__copy(&dst->args[i], &src->args[i]) < 0)
+ goto out_err;
+ return 0;
+
+out_err:
+ clear_perf_probe_event(dst);
+ return -ENOMEM;
+}
+
void clear_probe_trace_event(struct probe_trace_event *tev)
{
struct probe_trace_arg_ref *ref, *next;
@@ -2505,9 +2578,6 @@ static int find_probe_functions(struct map *map, char *name,
return found;
}
-#define strdup_or_goto(str, label) \
- ({ char *__p = strdup(str); if (!__p) goto label; __p; })
-
void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
struct probe_trace_event *tev __maybe_unused,
struct map *map __maybe_unused,
diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
index 5a27eb4..367f886 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -122,6 +122,9 @@ char *synthesize_perf_probe_command(struct perf_probe_event *pev);
char *synthesize_probe_trace_command(struct probe_trace_event *tev);
char *synthesize_perf_probe_arg(struct perf_probe_arg *pa);
+int perf_probe_event__copy(struct perf_probe_event *dst,
+ struct perf_probe_event *src);
+
/* Check the perf_probe_event needs debuginfo */
bool perf_probe_event_need_dwarf(struct perf_probe_event *pev);
[toc] | [prev] | [next] | [standalone]
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-06-08 11:40 +0200 |
| Subject | [PATCH perf/core v10 21/23] perf probe: Support a special SDT probe format |
| Message-ID | <rHI7U-6Pu-23@gated-at.bofh.it> |
| In reply to | #1417162 |
Support a special SDT probe format which can omit the '%' prefix
only if the SDT group name starts with "sdt_". So, for example
both of "%sdt_libc:setjump" and "sdt_libc:setjump" are acceptable
for perf probe --add.
Suggested-by: Brendan Gregg <brendan.d.gregg@gmail.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
tools/perf/Documentation/perf-probe.txt | 4 +++-
tools/perf/util/probe-event.c | 12 ++++++++++--
2 files changed, 13 insertions(+), 3 deletions(-)
diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt
index 39e3870..736da44 100644
--- a/tools/perf/Documentation/perf-probe.txt
+++ b/tools/perf/Documentation/perf-probe.txt
@@ -152,7 +152,9 @@ Probe points are defined by following syntax.
[[GROUP:]EVENT=]SRC;PTN [ARG ...]
4) Pre-defined SDT events or cached event with name
- %[PROVIDER:]SDTEVENT
+ %[sdt_PROVIDER:]SDTEVENT
+ or,
+ sdt_PROVIDER:SDTEVENT
'EVENT' specifies the name of new event, if omitted, it will be set the name of the probed function. You can also specify a group name by 'GROUP', if omitted, set 'probe' is used for kprobe and 'probe_<bin>' is used for uprobe.
Note that using existing group name can conflict with other events. Especially, using the group name reserved for kernel modules can hide embedded events in the
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 6d3398b..7c43c6a 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1245,9 +1245,17 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
if (!arg)
return -EINVAL;
- if (arg[0] == '%') {
+ /*
+ * If the probe point starts with '%',
+ * or starts with "sdt_" and has a ':' but no '=',
+ * then it should be a SDT/cached probe point.
+ */
+ if (arg[0] == '%' ||
+ (!strncmp(arg, "sdt_", 4) &&
+ !!strchr(arg, ':') && !strchr(arg, '='))) {
pev->sdt = true;
- arg++;
+ if (arg[0] == '%')
+ arg++;
}
ptr = strpbrk(arg, ";=@+%");
[toc] | [prev] | [next] | [standalone]
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-06-08 11:40 +0200 |
| Subject | [PATCH perf/core v10 16/23] perf-list: Skip SDTs placed in invalid binaries |
| Message-ID | <rHI7U-6Pu-39@gated-at.bofh.it> |
| In reply to | #1417162 |
From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Skip SDTs placed in invalid (non-exist, or older version)
binaries. Note that perf-probe --cache --list and
perf-probe --cache --del still handle all the caches
including invalid binaries.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
Changes in v7:
- Validate build-id via sysfs if it is for kallsyms,
Changes in v4:
- Rename a parameter 'valid' to 'validonly' :)
---
tools/perf/builtin-probe.c | 2 +-
tools/perf/util/build-id.c | 33 ++++++++++++++++++++++++++++++++-
tools/perf/util/build-id.h | 2 +-
tools/perf/util/parse-events.c | 2 +-
tools/perf/util/probe-file.c | 2 +-
5 files changed, 36 insertions(+), 5 deletions(-)
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 8f61525..4a86aea 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -370,7 +370,7 @@ static int del_perf_probe_caches(struct strfilter *filter)
struct str_node *nd;
int ret;
- ret = build_id_cache__list_all(&bidlist);
+ ret = build_id_cache__list_all(&bidlist, false);
if (ret < 0) {
pr_debug("Failed to get buildids: %d\n", ret);
return ret;
diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index 68a67eb..424f4e2 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -209,6 +209,31 @@ out:
return ret;
}
+/* Check if the given build_id cache is valid on current running system */
+static bool build_id_cache__valid_id(char *sbuild_id)
+{
+ char real_sbuild_id[SBUILD_ID_SIZE] = "";
+ char *pathname;
+ int ret = 0;
+ bool result = false;
+
+ pathname = build_id_cache__origname(sbuild_id);
+ if (!pathname)
+ return false;
+
+ if (!strcmp(pathname, DSO__NAME_KALLSYMS))
+ ret = sysfs__sprintf_build_id("/", real_sbuild_id);
+ else if (pathname[0] == '/')
+ ret = filename__sprintf_build_id(pathname, real_sbuild_id);
+ else
+ ret = -EINVAL; /* Should we support other special DSO cache? */
+ if (ret >= 0)
+ result = (strcmp(sbuild_id, real_sbuild_id) == 0);
+ free(pathname);
+
+ return result;
+}
+
static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso)
{
return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : "elf");
@@ -420,7 +445,7 @@ void disable_buildid_cache(void)
no_buildid_cache = true;
}
-int build_id_cache__list_all(struct strlist **result)
+int build_id_cache__list_all(struct strlist **result, bool validonly)
{
struct strlist *toplist, *list, *bidlist;
struct str_node *nd, *nd2;
@@ -428,6 +453,10 @@ int build_id_cache__list_all(struct strlist **result)
char sbuild_id[SBUILD_ID_SIZE];
int ret = 0;
+ /* for filename__ functions */
+ if (validonly)
+ symbol__init(NULL);
+
/* Open the top-level directory */
if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0)
return -errno;
@@ -457,6 +486,8 @@ int build_id_cache__list_all(struct strlist **result)
nd->s, nd2->s);
continue;
}
+ if (validonly && !build_id_cache__valid_id(sbuild_id))
+ continue;
strlist__add(bidlist, sbuild_id);
}
strlist__delete(list);
diff --git a/tools/perf/util/build-id.h b/tools/perf/util/build-id.h
index c05503e..480600b 100644
--- a/tools/perf/util/build-id.h
+++ b/tools/perf/util/build-id.h
@@ -34,7 +34,7 @@ char *build_id_cache__origname(const char *sbuild_id);
char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size);
char *build_id_cache__cachedir(const char *sbuild_id, const char *name,
bool is_kallsyms, bool is_vdso);
-int build_id_cache__list_all(struct strlist **result);
+int build_id_cache__list_all(struct strlist **result, bool validonly);
int build_id_cache__list_build_ids(const char *pathname,
struct strlist **result);
bool build_id_cache__cached(const char *sbuild_id);
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 4c7437f..5932b58 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -2002,7 +2002,7 @@ void print_sdt_events(const char *subsys_glob, const char *event_glob,
pr_debug("Failed to allocate new strlist for SDT\n");
return;
}
- ret = build_id_cache__list_all(&bidlist);
+ ret = build_id_cache__list_all(&bidlist, true);
if (ret < 0) {
pr_debug("Failed to get buildids: %d\n", ret);
return;
diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
index a222fb2..4d8ba72 100644
--- a/tools/perf/util/probe-file.c
+++ b/tools/perf/util/probe-file.c
@@ -781,7 +781,7 @@ int probe_cache__show_all_caches(struct strfilter *filter)
pr_debug("list cache with filter: %s\n", buf);
free(buf);
- ret = build_id_cache__list_all(&bidlist);
+ ret = build_id_cache__list_all(&bidlist, false);
if (ret < 0) {
pr_debug("Failed to get buildids: %d\n", ret);
return ret == -ENOENT ? 0 : ret;
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| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-06-08 11:40 +0200 |
| Subject | [PATCH perf/core v10 13/23] perf buildid-cache: Scan and import user SDT events to probe cache |
| Message-ID | <rHI7U-6Pu-47@gated-at.bofh.it> |
| In reply to | #1417162 |
From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
perf buildid-cache --add <binary> scans given binary and add
the SDT events to probe cache. "sdt_" prefix is appended for
all SDT providers to avoid event-name clash with other pre-defined
events. It is possible to use the cached SDT events as other cached
events, via perf probe --add "sdt_<provider>:<event>=<event>".
e.g.
----
# perf buildid-cache --add /lib/libc-2.17.so
# perf probe --cache --list | head -n 5
/usr/lib/libc-2.17.so (a6fb821bdf53660eb2c29f778757aef294d3d392):
sdt_libc:setjmp=setjmp
sdt_libc:longjmp=longjmp
sdt_libc:longjmp_target=longjmp_target
sdt_libc:memory_heap_new=memory_heap_new
# perf probe -x /usr/lib/libc-2.17.so \
-a sdt_libc:memory_heap_new=memory_heap_new
Added new event:
sdt_libc:memory_heap_new (on memory_heap_new
in /usr/lib/libc-2.17.so)
You can now use it in all perf tools, such as:
perf record -e sdt_libc:memory_heap_new -aR sleep 1
# perf probe -l
sdt_libc:memory_heap_new (on new_heap+183 in /usr/lib/libc-2.17.so)
----
Note that SDT event entries in probe-cache file is somewhat different
from normal cached events. Normal one starts with "#", but SDTs are
starting with "%".
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
Changes in v10:
- Update Documentation/perf-buildid-cache.txt too.
Changes in v4:
- Fix a bug to copy correct group name to entries.
- Fix to consolidate same-name entries.
---
tools/perf/Documentation/perf-buildid-cache.txt | 3 +
tools/perf/util/build-id.c | 27 ++++++++-
tools/perf/util/probe-file.c | 67 ++++++++++++++++++++++-
tools/perf/util/probe-file.h | 2 +
4 files changed, 93 insertions(+), 6 deletions(-)
diff --git a/tools/perf/Documentation/perf-buildid-cache.txt b/tools/perf/Documentation/perf-buildid-cache.txt
index dd07b55..058064d 100644
--- a/tools/perf/Documentation/perf-buildid-cache.txt
+++ b/tools/perf/Documentation/perf-buildid-cache.txt
@@ -15,6 +15,9 @@ DESCRIPTION
This command manages the build-id cache. It can add, remove, update and purge
files to/from the cache. In the future it should as well set upper limits for
the space used by the cache, etc.
+This also scans the target binary for SDT (Statically Defined Tracing) and
+record it along with the buildid-cache, which will be used by perf-probe.
+For more details, see linkperf:perf-probe[1].
OPTIONS
-------
diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index 14fbd37..68a67eb 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -17,6 +17,7 @@
#include "tool.h"
#include "header.h"
#include "vdso.h"
+#include "probe-file.h"
static bool no_buildid_cache;
@@ -513,6 +514,23 @@ int build_id_cache__list_build_ids(const char *pathname,
return ret;
}
+#ifdef HAVE_LIBELF_SUPPORT
+static void build_id_cache__add_sdt_cache(const char *sbuild_id,
+ const char *realname)
+{
+ struct probe_cache *cache;
+
+ cache = probe_cache__new(sbuild_id);
+ if (!cache)
+ return;
+ if (probe_cache__scan_sdt(cache, realname) >= 0)
+ probe_cache__commit(cache);
+ probe_cache__delete(cache);
+}
+#else
+#define build_id_cache__add_sdt_cache(sbuild_id, realname) do { } while (0)
+#endif
+
int build_id_cache__add_s(const char *sbuild_id, const char *name,
bool is_kallsyms, bool is_vdso)
{
@@ -556,20 +574,23 @@ int build_id_cache__add_s(const char *sbuild_id, const char *name,
goto out_free;
}
+ /* Make a symbolic link */
if (!build_id_cache__linkname(sbuild_id, linkname, size))
goto out_free;
+
tmp = strrchr(linkname, '/');
*tmp = '\0';
-
if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
goto out_free;
-
*tmp = '/';
tmp = dir_name + strlen(buildid_dir) - 5;
memcpy(tmp, "../..", 5);
-
if (symlink(tmp, linkname) == 0)
err = 0;
+
+ /* Update SDT cache */
+ build_id_cache__add_sdt_cache(sbuild_id, realname);
+
out_free:
if (!is_kallsyms)
free(realname);
diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
index f687607..0fcd275 100644
--- a/tools/perf/util/probe-file.c
+++ b/tools/perf/util/probe-file.c
@@ -429,12 +429,15 @@ static int probe_cache__load(struct probe_cache *pcache)
p = strchr(buf, '\n');
if (p)
*p = '\0';
- if (buf[0] == '#') { /* #perf_probe_event */
+ /* #perf_probe_event or %sdt_event */
+ if (buf[0] == '#' || buf[0] == '%') {
entry = probe_cache_entry__new(NULL);
if (!entry) {
ret = -ENOMEM;
goto out;
}
+ if (buf[0] == '%')
+ entry->sdt = true;
entry->spev = strdup(buf + 1);
if (entry->spev)
ret = parse_perf_probe_command(buf + 1,
@@ -611,14 +614,72 @@ out_err:
return ret;
}
+static unsigned long long sdt_note__get_addr(struct sdt_note *note)
+{
+ return note->bit32 ? (unsigned long long)note->addr.a32[0]
+ : (unsigned long long)note->addr.a64[0];
+}
+
+int probe_cache__scan_sdt(struct probe_cache *pcache, const char *pathname)
+{
+ struct probe_cache_entry *entry = NULL;
+ struct list_head sdtlist;
+ struct sdt_note *note;
+ char *buf;
+ char sdtgrp[64];
+ int ret;
+
+ INIT_LIST_HEAD(&sdtlist);
+ ret = get_sdt_note_list(&sdtlist, pathname);
+ if (ret < 0) {
+ pr_debug("Failed to get sdt note: %d\n", ret);
+ return ret;
+ }
+ list_for_each_entry(note, &sdtlist, note_list) {
+ ret = snprintf(sdtgrp, 64, "sdt_%s", note->provider);
+ if (ret < 0)
+ break;
+ /* Try to find same-name entry */
+ entry = probe_cache__find_by_name(pcache, sdtgrp, note->name);
+ if (!entry) {
+ entry = probe_cache_entry__new(NULL);
+ if (!entry) {
+ ret = -ENOMEM;
+ break;
+ }
+ entry->sdt = true;
+ ret = asprintf(&entry->spev, "%s:%s=%s", sdtgrp,
+ note->name, note->name);
+ if (ret < 0)
+ break;
+ entry->pev.event = strdup(note->name);
+ entry->pev.group = strdup(sdtgrp);
+ list_add_tail(&entry->list, &pcache->list);
+ }
+ ret = asprintf(&buf, "p:%s/%s %s:0x%llx",
+ sdtgrp, note->name, pathname,
+ sdt_note__get_addr(note));
+ if (ret < 0)
+ break;
+ strlist__add(entry->tevlist, buf);
+ free(buf);
+ entry = NULL;
+ }
+ if (entry)
+ probe_cache_entry__delete(entry);
+ cleanup_sdt_note_list(&sdtlist);
+ return ret;
+}
+
static int probe_cache_entry__write(struct probe_cache_entry *entry, int fd)
{
struct str_node *snode;
struct iovec iov[3];
+ const char *prefix = entry->sdt ? "%" : "#";
int ret;
- pr_debug("Writing cache: #%s\n", entry->spev);
- iov[0].iov_base = (void *)"#"; iov[0].iov_len = 1;
+ pr_debug("Writing cache: %s%s\n", prefix, entry->spev);
+ iov[0].iov_base = (void *)prefix; iov[0].iov_len = 1;
iov[1].iov_base = entry->spev; iov[1].iov_len = strlen(entry->spev);
iov[2].iov_base = (void *)"\n"; iov[2].iov_len = 1;
ret = writev(fd, iov, 3);
diff --git a/tools/perf/util/probe-file.h b/tools/perf/util/probe-file.h
index e6fd9b9..93aa193 100644
--- a/tools/perf/util/probe-file.h
+++ b/tools/perf/util/probe-file.h
@@ -8,6 +8,7 @@
/* Cache of probe definitions */
struct probe_cache_entry {
struct list_head list;
+ bool sdt;
struct perf_probe_event pev;
char *spev;
struct strlist *tevlist;
@@ -35,6 +36,7 @@ struct probe_cache *probe_cache__new(const char *target);
int probe_cache__add_entry(struct probe_cache *pcache,
struct perf_probe_event *pev,
struct probe_trace_event *tevs, int ntevs);
+int probe_cache__scan_sdt(struct probe_cache *pcache, const char *pathname);
int probe_cache__commit(struct probe_cache *pcache);
void probe_cache__delete(struct probe_cache *pcache);
int probe_cache__remove_entries(struct probe_cache *pcache,
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