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Groups > linux.kernel > #1408482 > unrolled thread
| Started by | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| First post | 2016-05-28 17:20 +0200 |
| Last post | 2016-05-31 18:40 +0200 |
| Articles | 20 on this page of 23 — 5 participants |
Back to article view | Back to linux.kernel
[PATCH perf/core v9 00/16] perf-probe --cache and SDT support Masami Hiramatsu <mhiramat@kernel.org> - 2016-05-28 17:20 +0200
[PATCH perf/core v9 08/16] perf/sdt: ELF support for SDT Masami Hiramatsu <mhiramat@kernel.org> - 2016-05-28 17:20 +0200
[PATCH perf/core v9 15/16] perf probe: Support @BUILDID or @FILE suffix for SDT events Masami Hiramatsu <mhiramat@kernel.org> - 2016-05-28 17:20 +0200
[PATCH perf/core v9 01/16] perf-symbol: Introduce filename__readable to check readability Masami Hiramatsu <mhiramat@kernel.org> - 2016-05-28 17:20 +0200
Re: [PATCH perf/core v9 01/16] perf-symbol: Introduce filename__readable to check readability Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-05-30 18:10 +0200
Re: [PATCH perf/core v9 01/16] perf-symbol: Introduce filename__readable to check readability Masami Hiramatsu <mhiramat@kernel.org> - 2016-05-31 08:00 +0200
Re: [PATCH perf/core v9 01/16] perf-symbol: Introduce filename__readable to check readability Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-05-30 18:10 +0200
[tip:perf/core] perf symbols: Introduce filename__readable to check readability tip-bot for Masami Hiramatsu <tipbot@zytor.com> - 2016-06-02 08:40 +0200
[PATCH perf/core v9 09/16] perf probe: Add group name support Masami Hiramatsu <mhiramat@kernel.org> - 2016-05-28 17:20 +0200
[PATCH perf/core v9 04/16] perf probe: Add --cache option to cache the probe definitions Masami Hiramatsu <mhiramat@kernel.org> - 2016-05-28 17:20 +0200
[PATCH perf/core v9 05/16] perf probe: Use cache entry if possible Masami Hiramatsu <mhiramat@kernel.org> - 2016-05-28 17:20 +0200
[PATCH perf/core v9 14/16] perf probe: Allow wildcard for cached events Masami Hiramatsu <mhiramat@kernel.org> - 2016-05-28 17:20 +0200
[PATCH perf/core v9 10/16] perf buildid-cache: Scan and import user SDT events to probe cache Masami Hiramatsu <mhiramat@kernel.org> - 2016-05-28 17:20 +0200
Re: [PATCH perf/core v9 00/16] perf-probe --cache and SDT support Namhyung Kim <namhyung@kernel.org> - 2016-05-30 06:00 +0200
Re: [PATCH perf/core v9 00/16] perf-probe --cache and SDT support Masami Hiramatsu <mhiramat@kernel.org> - 2016-05-30 16:40 +0200
Re: [PATCH perf/core v9 00/16] perf-probe --cache and SDT support Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-05-30 18:20 +0200
Re: [PATCH perf/core v9 00/16] perf-probe --cache and SDT support Masami Hiramatsu <mhiramat@kernel.org> - 2016-05-31 11:10 +0200
Re: [PATCH perf/core v9 00/16] perf-probe --cache and SDT support Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-05-31 15:50 +0200
Re: [PATCH perf/core v9 00/16] perf-probe --cache and SDT support Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-05-30 18:30 +0200
Re: [PATCH perf/core v9 00/16] perf-probe --cache and SDT support Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-05-30 18:40 +0200
Re: [PATCH perf/core v9 00/16] perf-probe --cache and SDT support Masami Hiramatsu <mhiramat@kernel.org> - 2016-05-31 10:10 +0200
Re: [PATCH perf/core v9 00/16] perf-probe --cache and SDT support Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-05-31 15:40 +0200
Re: [PATCH perf/core v9 00/16] perf-probe --cache and SDT support Hemant Kumar <hemant@linux.vnet.ibm.com> - 2016-05-31 18:40 +0200
Page 1 of 2 [1] 2 Next page →
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-05-28 17:20 +0200 |
| Subject | [PATCH perf/core v9 00/16] perf-probe --cache and SDT support |
| Message-ID | <rDObT-25o-3@gated-at.bofh.it> |
Hi,
Here is the 9th version of the patchset for probe-cache and
initial SDT support.
The previous version is here; https://lkml.org/lkml/2016/5/14/107
This version just fixes 2 points according to Hemant's comment,
and split out the filename__readable() patch.
Changes in v9:
- [1/16,2/16] split out the filename__readable()
- [7/16] Fix to show which event is deleted.
- [12/16] Update list_usage to show sdt option.
Thank you,
---
Hemant Kumar (1):
perf/sdt: ELF support for SDT
Masami Hiramatsu (15):
perf-symbol: Introduce filename__readable to check readability
perf symbol: Cleanup the code flow of dso__find_kallsyms
perf-buildid-cache: Use path/to/bin/buildid/elf instead of path/to/bin/buildid
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: Allow wildcard for cached events
perf probe: Support @BUILDID or @FILE suffix for SDT events
perf probe: Support a special SDT probe format
tools/perf/Documentation/perf-probe.txt | 26 +-
tools/perf/builtin-list.c | 6
tools/perf/builtin-probe.c | 30 ++
tools/perf/util/build-id.c | 295 ++++++++++++++++--
tools/perf/util/build-id.h | 8
tools/perf/util/dso.h | 5
tools/perf/util/parse-events.c | 83 +++++
tools/perf/util/parse-events.h | 2
tools/perf/util/probe-event.c | 492 +++++++++++++++++++++++++++---
tools/perf/util/probe-event.h | 7
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.c | 71 ++--
tools/perf/util/symbol.h | 22 +
15 files changed, 1712 insertions(+), 132 deletions(-)
--
Masami Hiramatsu
[toc] | [next] | [standalone]
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-05-28 17:20 +0200 |
| Subject | [PATCH perf/core v9 08/16] perf/sdt: ELF support for SDT |
| Message-ID | <rDObU-25o-29@gated-at.bofh.it> |
| In reply to | #1408482 |
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 | 2016-05-28 17:20 +0200 |
| Subject | [PATCH perf/core v9 15/16] perf probe: Support @BUILDID or @FILE suffix for SDT events |
| Message-ID | <rDObU-25o-33@gated-at.bofh.it> |
| In reply to | #1408482 |
Support @BUILDID or @FILE suffix for SDT events. This allows
perf to add probes on SDTs/pre-cached events on given FILE
or the file which has given BUILDID (also, this complements
BUILDID.)
For example, both gcc and libstdc++ has same SDTs as below.
If you would like to add a probe on sdt_libstdcxx:catch on gcc,
you can do as below.
----
# perf list sdt | tail -n 6
sdt_libstdcxx:catch@/usr/bin/gcc(0cc207fc4b27) [SDT event]
sdt_libstdcxx:catch@/usr/lib64/libstdc++.so.6.0.20(91c7a88fdf49)
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)
# perf probe -a sdt_libstdcxx:catch@0cc
Added new event:
sdt_libstdcxx:catch (on %catch in /usr/bin/gcc)
You can now use it in all perf tools, such as:
perf record -e sdt_libstdcxx:catch -aR sleep 1
----
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
tools/perf/util/build-id.c | 40 ++++++++++++++++++++++++++++++++++++++++
tools/perf/util/build-id.h | 1 +
tools/perf/util/probe-event.c | 16 ++++++++++++++--
3 files changed, 55 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index 424f4e2..c32931c 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -504,6 +504,46 @@ out:
return ret;
}
+static bool str_is_build_id(const char *maybe_sbuild_id, size_t len)
+{
+ size_t i;
+
+ for (i = 0; i < len; i++) {
+ if (!isxdigit(maybe_sbuild_id[i]))
+ return false;
+ }
+ return true;
+}
+
+/* Return the valid complete build-id */
+char *build_id_cache__complement(const char *incomplete_sbuild_id)
+{
+ struct strlist *list;
+ struct str_node *nd, *cand = NULL;
+ char *sbuild_id = NULL;
+ size_t len = strlen(incomplete_sbuild_id);
+
+ if (len >= SBUILD_ID_SIZE ||
+ !str_is_build_id(incomplete_sbuild_id, len) ||
+ build_id_cache__list_all(&list, true) < 0)
+ return NULL;
+
+ strlist__for_each(nd, list) {
+ if (strncmp(nd->s, incomplete_sbuild_id, len) != 0)
+ continue;
+ if (cand) { /* Error: There are more than 2 candidates. */
+ cand = NULL;
+ break;
+ }
+ cand = nd;
+ }
+ if (cand)
+ sbuild_id = strdup(cand->s);
+ strlist__delete(list);
+
+ return sbuild_id;
+}
+
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 480600b..9bd6d0b 100644
--- a/tools/perf/util/build-id.h
+++ b/tools/perf/util/build-id.h
@@ -35,6 +35,7 @@ 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, bool validonly);
+char *build_id_cache__complement(const char *incomplete_sbuild_id);
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 0019a22..bd31cac 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1253,8 +1253,20 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
ptr = strpbrk(arg, ";=@+%");
if (pev->sdt) {
if (ptr) {
- semantic_error("%s must contain only an SDT event name.\n", arg);
- return -EINVAL;
+ if (*ptr != '@') {
+ semantic_error("%s must contain only an SDT event name.\n", arg);
+ return -EINVAL;
+ }
+ /* This must be a target file name or build id */
+ tmp = build_id_cache__complement(ptr + 1);
+ if (tmp) {
+ pev->target = build_id_cache__origname(tmp);
+ free(tmp);
+ } else
+ pev->target = strdup(ptr + 1);
+ if (!pev->target)
+ return -ENOMEM;
+ *ptr = '\0';
}
ret = parse_perf_probe_event_name(&arg, pev);
if (ret == 0) {
[toc] | [prev] | [next] | [standalone]
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-05-28 17:20 +0200 |
| Subject | [PATCH perf/core v9 01/16] perf-symbol: Introduce filename__readable to check readability |
| Message-ID | <rDObU-25o-37@gated-at.bofh.it> |
| In reply to | #1408482 |
Introduce filename__readable to check readability by opening
the file directly. Since the access(R_OK) just checks the
readability based on real UID/GID, it is ignored that the
effective UID/GID and capabilities for some special file (e.g.
/proc/kcore).
filename__readable() directly opens given file with O_RDONLY
so that the kernel checks it by effective UID/GID and capabilities.
---
tools/perf/util/symbol.c | 32 ++++++++++++++++++++++----------
1 file changed, 22 insertions(+), 10 deletions(-)
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 54c4ff2..a469346 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1641,6 +1641,20 @@ static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
return ret;
}
+/*
+ * Use open(O_RDONLY) to check readability directly instead of access(R_OK)
+ * since access(R_OK) only checks with real UID/GID but open() use effective
+ * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO).
+ */
+static bool filename__readable(const char *file)
+{
+ int fd = open(file, O_RDONLY);
+ if (fd < 0)
+ return false;
+ close(fd);
+ return true;
+}
+
static char *dso__find_kallsyms(struct dso *dso, struct map *map)
{
u8 host_build_id[BUILD_ID_SIZE];
@@ -1668,7 +1682,6 @@ static char *dso__find_kallsyms(struct dso *dso, struct map *map)
/* Use /proc/kallsyms if possible */
if (is_host) {
DIR *d;
- int fd;
/* If no cached kcore go with /proc/kallsyms */
d = opendir(path);
@@ -1677,16 +1690,15 @@ static char *dso__find_kallsyms(struct dso *dso, struct map *map)
closedir(d);
/*
- * Do not check the build-id cache, until we know we cannot use
- * /proc/kcore.
+ * Do not check the build-id cache, unless we know we cannot use
+ * /proc/kcore or module maps don't match to /proc/kallsyms.
+ * To check readability of /proc/kcore, do not use access(R_OK)
+ * since /proc/kcore requires CAP_SYS_RAWIO to read and access
+ * can't check it.
*/
- fd = open("/proc/kcore", O_RDONLY);
- if (fd != -1) {
- close(fd);
- /* If module maps match go with /proc/kallsyms */
- if (!validate_kcore_addresses("/proc/kallsyms", map))
- goto proc_kallsyms;
- }
+ if (filename__readable("/proc/kcore") &&
+ !validate_kcore_addresses("/proc/kallsyms", map))
+ goto proc_kallsyms;
/* Find kallsyms in build-id cache with kcore */
if (!find_matching_kcore(map, path, sizeof(path)))
[toc] | [prev] | [next] | [standalone]
| From | Arnaldo Carvalho de Melo <acme@kernel.org> |
|---|---|
| Date | 2016-05-30 18:10 +0200 |
| Subject | Re: [PATCH perf/core v9 01/16] perf-symbol: Introduce filename__readable to check readability |
| Message-ID | <rExVn-6ui-1@gated-at.bofh.it> |
| In reply to | #1408485 |
Em Mon, May 30, 2016 at 01:03:17PM -0300, Arnaldo Carvalho de Melo escreveu: > Em Sun, May 29, 2016 at 12:15:13AM +0900, Masami Hiramatsu escreveu: > > Introduce filename__readable to check readability by opening > > the file directly. Since the access(R_OK) just checks the > > readability based on real UID/GID, it is ignored that the > > effective UID/GID and capabilities for some special file (e.g. > > /proc/kcore). > > filename__readable() directly opens given file with O_RDONLY > > so that the kernel checks it by effective UID/GID and capabilities. > > > You missed the Signed-off-by line. This this for you this time, no need to resend. - Arnaldo
[toc] | [prev] | [next] | [standalone]
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-05-31 08:00 +0200 |
| Subject | Re: [PATCH perf/core v9 01/16] perf-symbol: Introduce filename__readable to check readability |
| Message-ID | <rEKSC-6Nu-3@gated-at.bofh.it> |
| In reply to | #1409252 |
On Mon, 30 May 2016 13:04:47 -0300 Arnaldo Carvalho de Melo <acme@kernel.org> wrote: > Em Mon, May 30, 2016 at 01:03:17PM -0300, Arnaldo Carvalho de Melo escreveu: > > Em Sun, May 29, 2016 at 12:15:13AM +0900, Masami Hiramatsu escreveu: > > > Introduce filename__readable to check readability by opening > > > the file directly. Since the access(R_OK) just checks the > > > readability based on real UID/GID, it is ignored that the > > > effective UID/GID and capabilities for some special file (e.g. > > > /proc/kcore). > > > filename__readable() directly opens given file with O_RDONLY > > > so that the kernel checks it by effective UID/GID and capabilities. > > > > > > You missed the Signed-off-by line. > > This this for you this time, no need to resend. Oops, and thanks!! > > - Arnaldo -- Masami Hiramatsu <mhiramat@kernel.org>
[toc] | [prev] | [next] | [standalone]
| From | Arnaldo Carvalho de Melo <acme@kernel.org> |
|---|---|
| Date | 2016-05-30 18:10 +0200 |
| Subject | Re: [PATCH perf/core v9 01/16] perf-symbol: Introduce filename__readable to check readability |
| Message-ID | <rExVn-6ui-3@gated-at.bofh.it> |
| In reply to | #1408485 |
Em Sun, May 29, 2016 at 12:15:13AM +0900, Masami Hiramatsu escreveu:
> Introduce filename__readable to check readability by opening
> the file directly. Since the access(R_OK) just checks the
> readability based on real UID/GID, it is ignored that the
> effective UID/GID and capabilities for some special file (e.g.
> /proc/kcore).
> filename__readable() directly opens given file with O_RDONLY
> so that the kernel checks it by effective UID/GID and capabilities.
You missed the Signed-off-by line.
- Arnaldo
> ---
> tools/perf/util/symbol.c | 32 ++++++++++++++++++++++----------
> 1 file changed, 22 insertions(+), 10 deletions(-)
>
> diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
> index 54c4ff2..a469346 100644
> --- a/tools/perf/util/symbol.c
> +++ b/tools/perf/util/symbol.c
> @@ -1641,6 +1641,20 @@ static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
> return ret;
> }
>
> +/*
> + * Use open(O_RDONLY) to check readability directly instead of access(R_OK)
> + * since access(R_OK) only checks with real UID/GID but open() use effective
> + * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO).
> + */
> +static bool filename__readable(const char *file)
> +{
> + int fd = open(file, O_RDONLY);
> + if (fd < 0)
> + return false;
> + close(fd);
> + return true;
> +}
> +
> static char *dso__find_kallsyms(struct dso *dso, struct map *map)
> {
> u8 host_build_id[BUILD_ID_SIZE];
> @@ -1668,7 +1682,6 @@ static char *dso__find_kallsyms(struct dso *dso, struct map *map)
> /* Use /proc/kallsyms if possible */
> if (is_host) {
> DIR *d;
> - int fd;
>
> /* If no cached kcore go with /proc/kallsyms */
> d = opendir(path);
> @@ -1677,16 +1690,15 @@ static char *dso__find_kallsyms(struct dso *dso, struct map *map)
> closedir(d);
>
> /*
> - * Do not check the build-id cache, until we know we cannot use
> - * /proc/kcore.
> + * Do not check the build-id cache, unless we know we cannot use
> + * /proc/kcore or module maps don't match to /proc/kallsyms.
> + * To check readability of /proc/kcore, do not use access(R_OK)
> + * since /proc/kcore requires CAP_SYS_RAWIO to read and access
> + * can't check it.
> */
> - fd = open("/proc/kcore", O_RDONLY);
> - if (fd != -1) {
> - close(fd);
> - /* If module maps match go with /proc/kallsyms */
> - if (!validate_kcore_addresses("/proc/kallsyms", map))
> - goto proc_kallsyms;
> - }
> + if (filename__readable("/proc/kcore") &&
> + !validate_kcore_addresses("/proc/kallsyms", map))
> + goto proc_kallsyms;
>
> /* Find kallsyms in build-id cache with kcore */
> if (!find_matching_kcore(map, path, sizeof(path)))
[toc] | [prev] | [next] | [standalone]
| From | tip-bot for Masami Hiramatsu <tipbot@zytor.com> |
|---|---|
| Date | 2016-06-02 08:40 +0200 |
| Subject | [tip:perf/core] perf symbols: Introduce filename__readable to check readability |
| Message-ID | <rFusp-2oO-7@gated-at.bofh.it> |
| In reply to | #1408485 |
Commit-ID: 11870d714a1b744a0225e90b0b395346357defe9
Gitweb: http://git.kernel.org/tip/11870d714a1b744a0225e90b0b395346357defe9
Author: Masami Hiramatsu <mhiramat@kernel.org>
AuthorDate: Sun, 29 May 2016 00:15:13 +0900
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 30 May 2016 13:15:01 -0300
perf symbols: Introduce filename__readable to check readability
Introduce filename__readable to check readability by opening the file
directly. Since the access(R_OK) just checks the readability based on
real UID/GID, it is ignored that the effective UID/GID and capabilities
for some special file (e.g. /proc/kcore).
filename__readable() directly opens given file with O_RDONLY so that the
kernel checks it by effective UID/GID and capabilities.
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20160528151513.16098.97576.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/symbol.c | 32 ++++++++++++++++++++++----------
1 file changed, 22 insertions(+), 10 deletions(-)
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 54c4ff2..a469346 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1641,6 +1641,20 @@ static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
return ret;
}
+/*
+ * Use open(O_RDONLY) to check readability directly instead of access(R_OK)
+ * since access(R_OK) only checks with real UID/GID but open() use effective
+ * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO).
+ */
+static bool filename__readable(const char *file)
+{
+ int fd = open(file, O_RDONLY);
+ if (fd < 0)
+ return false;
+ close(fd);
+ return true;
+}
+
static char *dso__find_kallsyms(struct dso *dso, struct map *map)
{
u8 host_build_id[BUILD_ID_SIZE];
@@ -1668,7 +1682,6 @@ static char *dso__find_kallsyms(struct dso *dso, struct map *map)
/* Use /proc/kallsyms if possible */
if (is_host) {
DIR *d;
- int fd;
/* If no cached kcore go with /proc/kallsyms */
d = opendir(path);
@@ -1677,16 +1690,15 @@ static char *dso__find_kallsyms(struct dso *dso, struct map *map)
closedir(d);
/*
- * Do not check the build-id cache, until we know we cannot use
- * /proc/kcore.
+ * Do not check the build-id cache, unless we know we cannot use
+ * /proc/kcore or module maps don't match to /proc/kallsyms.
+ * To check readability of /proc/kcore, do not use access(R_OK)
+ * since /proc/kcore requires CAP_SYS_RAWIO to read and access
+ * can't check it.
*/
- fd = open("/proc/kcore", O_RDONLY);
- if (fd != -1) {
- close(fd);
- /* If module maps match go with /proc/kallsyms */
- if (!validate_kcore_addresses("/proc/kallsyms", map))
- goto proc_kallsyms;
- }
+ if (filename__readable("/proc/kcore") &&
+ !validate_kcore_addresses("/proc/kallsyms", map))
+ goto proc_kallsyms;
/* Find kallsyms in build-id cache with kcore */
if (!find_matching_kcore(map, path, sizeof(path)))
[toc] | [prev] | [next] | [standalone]
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-05-28 17:20 +0200 |
| Subject | [PATCH perf/core v9 09/16] perf probe: Add group name support |
| Message-ID | <rDObU-25o-27@gated-at.bofh.it> |
| In reply to | #1408482 |
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 57fd657..79da841 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 | 2016-05-28 17:20 +0200 |
| Subject | [PATCH perf/core v9 04/16] perf probe: Add --cache option to cache the probe definitions |
| Message-ID | <rDObU-25o-35@gated-at.bofh.it> |
| In reply to | #1408482 |
From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Add --cache option to cache the probe definitions. This
just saves the result of the dwarf analysis to probe cache.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
Changes in v6:
- Remove unneeded O_APPEND from open(). (Thanks Namhyung!)
- Fix to check the return value of probe_cache_entry__new and strdup.(ditto)
Changes in v5:
- Move probe_cache* definitions. (code cleanup)
Changes in v4:
- Remove cache saving failure message.
---
tools/perf/Documentation/perf-probe.txt | 4
tools/perf/builtin-probe.c | 1
tools/perf/util/build-id.c | 12 +
tools/perf/util/build-id.h | 2
tools/perf/util/probe-event.c | 124 +++++++++++--
tools/perf/util/probe-event.h | 5 +
tools/perf/util/probe-file.c | 307 +++++++++++++++++++++++++++++++
tools/perf/util/probe-file.h | 19 ++
8 files changed, 447 insertions(+), 27 deletions(-)
diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt
index 3a8a9ba..947db6f 100644
--- a/tools/perf/Documentation/perf-probe.txt
+++ b/tools/perf/Documentation/perf-probe.txt
@@ -109,6 +109,10 @@ OPTIONS
Dry run. With this option, --add and --del doesn't execute actual
adding and removal operations.
+--cache::
+ Cache the probes (with --add option). Any events which successfully added
+ are also stored in the cache file.
+
--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 9af859b..6d7ab431 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -512,6 +512,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
"Enable symbol demangling"),
OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
"Enable kernel symbol demangling"),
+ OPT_BOOLEAN(0, "cache", &probe_conf.cache, "Manipulate probe cache"),
OPT_END()
};
int ret;
diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index 67f986c..ccf0d0d 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -390,9 +390,8 @@ void disable_buildid_cache(void)
no_buildid_cache = true;
}
-static char *build_id_cache__dirname_from_path(const char *name,
- bool is_kallsyms, bool is_vdso,
- const char *sbuild_id)
+char *build_id_cache__cachedir(const char *sbuild_id, const char *name,
+ bool is_kallsyms, bool is_vdso)
{
char *realname = (char *)name, *filename;
bool slash = is_kallsyms || is_vdso;
@@ -420,8 +419,7 @@ int build_id_cache__list_build_ids(const char *pathname,
char *dir_name;
int ret = 0;
- dir_name = build_id_cache__dirname_from_path(pathname, false, false,
- NULL);
+ dir_name = build_id_cache__cachedir(NULL, pathname, false, false);
if (!dir_name)
return -ENOMEM;
@@ -447,8 +445,8 @@ int build_id_cache__add_s(const char *sbuild_id, const char *name,
goto out_free;
}
- dir_name = build_id_cache__dirname_from_path(name, is_kallsyms,
- is_vdso, sbuild_id);
+ dir_name = build_id_cache__cachedir(sbuild_id, name,
+ is_kallsyms, is_vdso);
if (!dir_name)
goto out_free;
diff --git a/tools/perf/util/build-id.h b/tools/perf/util/build-id.h
index e5435f4..d8c7f2f 100644
--- a/tools/perf/util/build-id.h
+++ b/tools/perf/util/build-id.h
@@ -30,6 +30,8 @@ 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__cachedir(const char *sbuild_id, const char *name,
+ bool is_kallsyms, bool is_vdso);
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 74401a2..854885b 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 */
@@ -1712,7 +1711,7 @@ 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;
@@ -1751,30 +1750,36 @@ 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)
@@ -2026,6 +2031,79 @@ 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;
@@ -2432,6 +2510,7 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
{
int i, fd, ret;
struct probe_trace_event *tev = NULL;
+ struct probe_cache *cache = NULL;
struct strlist *namelist;
fd = probe_file__open(PF_FL_RW | (pev->uprobes ? PF_FL_UPROBE : 0));
@@ -2473,6 +2552,14 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
}
if (ret == -EINVAL && pev->uprobes)
warn_uprobe_event_compat(tev);
+ if (ret == 0 && probe_conf.cache) {
+ cache = probe_cache__new(pev->target);
+ if (cache) {
+ probe_cache__add_entry(cache, pev, tevs, ntevs);
+ probe_cache__commit(cache);
+ probe_cache__delete(cache);
+ }
+ }
strlist__delete(namelist);
close_out:
@@ -2501,9 +2588,6 @@ 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..432b690 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -12,6 +12,7 @@ struct probe_conf {
bool show_location_range;
bool force_add;
bool no_inlines;
+ bool cache;
int max_probes;
};
extern struct probe_conf probe_conf;
@@ -121,6 +122,10 @@ 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);
/* Check the perf_probe_event needs debuginfo */
bool perf_probe_event_need_dwarf(struct perf_probe_event *pev);
diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
index 3fe6214..689d874 100644
--- a/tools/perf/util/probe-file.c
+++ b/tools/perf/util/probe-file.c
@@ -14,6 +14,7 @@
* GNU General Public License for more details.
*
*/
+#include <sys/uio.h>
#include "util.h"
#include "event.h"
#include "strlist.h"
@@ -324,3 +325,309 @@ int probe_file__del_events(int fd, struct strfilter *filter)
return ret;
}
+
+static void probe_cache_entry__delete(struct probe_cache_entry *node)
+{
+ if (!list_empty(&node->list))
+ list_del(&node->list);
+ if (node->tevlist)
+ strlist__delete(node->tevlist);
+ clear_perf_probe_event(&node->pev);
+ free(node->spev);
+ free(node);
+}
+
+static struct probe_cache_entry *
+probe_cache_entry__new(struct perf_probe_event *pev)
+{
+ struct probe_cache_entry *ret = zalloc(sizeof(*ret));
+
+ if (ret) {
+ INIT_LIST_HEAD(&ret->list);
+ ret->tevlist = strlist__new(NULL, NULL);
+ if (!ret->tevlist)
+ zfree(&ret);
+ if (ret && pev) {
+ ret->spev = synthesize_perf_probe_command(pev);
+ if (!ret->spev ||
+ perf_probe_event__copy(&ret->pev, pev) < 0) {
+ probe_cache_entry__delete(ret);
+ return NULL;
+ }
+ }
+ }
+
+ return ret;
+}
+
+/* For the kernel probe caches, pass target = NULL */
+static int probe_cache__open(struct probe_cache *pcache, const char *target)
+{
+ char cpath[PATH_MAX];
+ char sbuildid[SBUILD_ID_SIZE];
+ char *dir_name;
+ bool is_kallsyms = !target;
+ int ret, fd;
+
+ if (target)
+ ret = filename__sprintf_build_id(target, sbuildid);
+ else {
+ target = DSO__NAME_KALLSYMS;
+ ret = sysfs__sprintf_build_id("/", sbuildid);
+ }
+ if (ret < 0) {
+ pr_debug("Failed to get build-id from %s.\n", target);
+ return ret;
+ }
+
+ /* If we have no buildid cache, make it */
+ if (!build_id_cache__cached(sbuildid)) {
+ ret = build_id_cache__add_s(sbuildid, target,
+ is_kallsyms, NULL);
+ if (ret < 0) {
+ pr_debug("Failed to add build-id cache: %s\n", target);
+ return ret;
+ }
+ }
+
+ dir_name = build_id_cache__cachedir(sbuildid, target, is_kallsyms,
+ false);
+ if (!dir_name)
+ return -ENOMEM;
+
+ snprintf(cpath, PATH_MAX, "%s/probes", dir_name);
+ fd = open(cpath, O_CREAT | O_RDWR, 0644);
+ if (fd < 0)
+ pr_debug("Failed to open cache(%d): %s\n", fd, cpath);
+ free(dir_name);
+ pcache->fd = fd;
+
+ return fd;
+}
+
+static int probe_cache__load(struct probe_cache *pcache)
+{
+ struct probe_cache_entry *entry = NULL;
+ char buf[MAX_CMDLEN], *p;
+ int ret = 0;
+ FILE *fp;
+
+ fp = fdopen(dup(pcache->fd), "r");
+ while (!feof(fp)) {
+ if (!fgets(buf, MAX_CMDLEN, fp))
+ break;
+ p = strchr(buf, '\n');
+ if (p)
+ *p = '\0';
+ if (buf[0] == '#') { /* #perf_probe_event */
+ entry = probe_cache_entry__new(NULL);
+ if (!entry) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ entry->spev = strdup(buf + 1);
+ if (entry->spev)
+ ret = parse_perf_probe_command(buf + 1,
+ &entry->pev);
+ else
+ ret = -ENOMEM;
+ if (ret < 0) {
+ probe_cache_entry__delete(entry);
+ goto out;
+ }
+ list_add_tail(&entry->list, &pcache->list);
+ } else { /* trace_probe_event */
+ if (!entry) {
+ ret = -EINVAL;
+ goto out;
+ }
+ strlist__add(entry->tevlist, buf);
+ }
+ }
+out:
+ fclose(fp);
+ return ret;
+}
+
+static struct probe_cache *probe_cache__alloc(void)
+{
+ struct probe_cache *ret = zalloc(sizeof(*ret));
+
+ if (ret) {
+ INIT_LIST_HEAD(&ret->list);
+ ret->fd = -EINVAL;
+ }
+ return ret;
+}
+
+void probe_cache__delete(struct probe_cache *pcache)
+{
+ struct probe_cache_entry *entry;
+
+ if (!pcache)
+ return;
+
+ while (!list_empty(&pcache->list)) {
+ entry = list_first_entry(&pcache->list, typeof(*entry), list);
+ probe_cache_entry__delete(entry);
+ }
+ if (pcache->fd > 0)
+ close(pcache->fd);
+ free(pcache);
+}
+
+struct probe_cache *probe_cache__new(const char *target)
+{
+ struct probe_cache *pcache = probe_cache__alloc();
+ int ret;
+
+ if (!pcache)
+ return NULL;
+
+ ret = probe_cache__open(pcache, target);
+ if (ret < 0) {
+ pr_debug("Cache open error: %d\n", ret);
+ goto out_err;
+ }
+
+ ret = probe_cache__load(pcache);
+ if (ret < 0) {
+ pr_debug("Cache read error: %d\n", ret);
+ goto out_err;
+ }
+
+ return pcache;
+
+out_err:
+ probe_cache__delete(pcache);
+ return NULL;
+}
+
+static bool streql(const char *a, const char *b)
+{
+ if (a == b)
+ return true;
+
+ if (!a || !b)
+ return false;
+
+ return !strcmp(a, b);
+}
+
+static struct probe_cache_entry *
+probe_cache__find(struct probe_cache *pcache, struct perf_probe_event *pev)
+{
+ struct probe_cache_entry *entry = NULL;
+ char *cmd = NULL;
+
+ cmd = synthesize_perf_probe_command(pev);
+ if (!cmd)
+ return NULL;
+
+ list_for_each_entry(entry, &pcache->list, list) {
+ /* Hit if same event name or same command-string */
+ if ((pev->event &&
+ (streql(entry->pev.group, pev->group) &&
+ streql(entry->pev.event, pev->event))) ||
+ (!strcmp(entry->spev, cmd)))
+ goto found;
+ }
+ entry = NULL;
+
+found:
+ free(cmd);
+ return entry;
+}
+
+int probe_cache__add_entry(struct probe_cache *pcache,
+ struct perf_probe_event *pev,
+ struct probe_trace_event *tevs, int ntevs)
+{
+ struct probe_cache_entry *entry = NULL;
+ char *command;
+ int i, ret = 0;
+
+ if (!pcache || !pev || !tevs || ntevs <= 0) {
+ ret = -EINVAL;
+ goto out_err;
+ }
+
+ /* Remove old cache entry */
+ entry = probe_cache__find(pcache, pev);
+ if (entry)
+ probe_cache_entry__delete(entry);
+
+ ret = -ENOMEM;
+ entry = probe_cache_entry__new(pev);
+ if (!entry)
+ goto out_err;
+
+ for (i = 0; i < ntevs; i++) {
+ if (!tevs[i].point.symbol)
+ continue;
+
+ command = synthesize_probe_trace_command(&tevs[i]);
+ if (!command)
+ goto out_err;
+ strlist__add(entry->tevlist, command);
+ free(command);
+ }
+ list_add_tail(&entry->list, &pcache->list);
+ pr_debug("Added probe cache: %d\n", ntevs);
+ return 0;
+
+out_err:
+ pr_debug("Failed to add probe caches\n");
+ if (entry)
+ probe_cache_entry__delete(entry);
+ return ret;
+}
+
+static int probe_cache_entry__write(struct probe_cache_entry *entry, int fd)
+{
+ struct str_node *snode;
+ struct iovec iov[3];
+ int ret;
+
+ pr_debug("Writing cache: #%s\n", entry->spev);
+ iov[0].iov_base = (void *)"#"; 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);
+ if (ret < 0)
+ return ret;
+
+ strlist__for_each(snode, entry->tevlist) {
+ iov[0].iov_base = (void *)snode->s;
+ iov[0].iov_len = strlen(snode->s);
+ iov[1].iov_base = (void *)"\n"; iov[1].iov_len = 1;
+ ret = writev(fd, iov, 2);
+ if (ret < 0)
+ return ret;
+ }
+ return 0;
+}
+
+int probe_cache__commit(struct probe_cache *pcache)
+{
+ struct probe_cache_entry *entry;
+ int ret = 0;
+
+ /* TBD: if we do not update existing entries, skip it */
+ ret = lseek(pcache->fd, 0, SEEK_SET);
+ if (ret < 0)
+ goto out;
+
+ ret = ftruncate(pcache->fd, 0);
+ if (ret < 0)
+ goto out;
+
+ list_for_each_entry(entry, &pcache->list, list) {
+ ret = probe_cache_entry__write(entry, pcache->fd);
+ pr_debug("Cache committed: %d\n", ret);
+ if (ret < 0)
+ break;
+ }
+out:
+ return ret;
+}
diff --git a/tools/perf/util/probe-file.h b/tools/perf/util/probe-file.h
index 18ac9cf..d2b8791d 100644
--- a/tools/perf/util/probe-file.h
+++ b/tools/perf/util/probe-file.h
@@ -5,6 +5,19 @@
#include "strfilter.h"
#include "probe-event.h"
+/* Cache of probe definitions */
+struct probe_cache_entry {
+ struct list_head list;
+ struct perf_probe_event pev;
+ char *spev;
+ struct strlist *tevlist;
+};
+
+struct probe_cache {
+ int fd;
+ struct list_head list;
+};
+
#define PF_FL_UPROBE 1
#define PF_FL_RW 2
@@ -18,5 +31,11 @@ int probe_file__get_events(int fd, struct strfilter *filter,
struct strlist *plist);
int probe_file__del_strlist(int fd, struct strlist *namelist);
+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__commit(struct probe_cache *pcache);
+void probe_cache__delete(struct probe_cache *pcache);
#endif
[toc] | [prev] | [next] | [standalone]
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-05-28 17:20 +0200 |
| Subject | [PATCH perf/core v9 05/16] perf probe: Use cache entry if possible |
| Message-ID | <rDObU-25o-39@gated-at.bofh.it> |
| In reply to | #1408482 |
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 854885b..acc8341 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2472,17 +2472,24 @@ 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;
@@ -2529,7 +2536,7 @@ 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) */
@@ -2842,6 +2849,55 @@ 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)
{
@@ -2864,6 +2920,11 @@ 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 | 2016-05-28 17:20 +0200 |
| Subject | [PATCH perf/core v9 14/16] perf probe: Allow wildcard for cached events |
| Message-ID | <rDObU-25o-41@gated-at.bofh.it> |
| In reply to | #1408482 |
Allo glob wildcard for reusing cached/SDT events. This also
automatically find the target binaries, e.g.
# perf probe -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 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 | 211 +++++++++++++++++++++++++++++++++++++----
tools/perf/util/probe-event.h | 1
tools/perf/util/probe-file.c | 46 +++++++--
tools/perf/util/probe-file.h | 5 +
4 files changed, 232 insertions(+), 31 deletions(-)
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 5ec98b2..0019a22 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -236,7 +236,7 @@ static void clear_perf_probe_point(struct perf_probe_point *pp)
free(pp->lazy_line);
}
-static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs)
+void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs)
{
int i;
@@ -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);
@@ -1640,6 +1640,11 @@ 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;
+ }
+ tev->uprobes = (tp->module[0] == '/');
p++;
} else
p = argv[1];
@@ -2514,7 +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;
@@ -2527,7 +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;
@@ -2552,41 +2557,60 @@ static int probe_trace_event__set_name(struct probe_trace_event *tev,
return 0;
}
-static int __add_probe_trace_events(struct perf_probe_event *pev,
- struct probe_trace_event *tevs,
- int ntevs, bool allow_suffix)
+static int __open_probe_file_and_namelist(bool uprobe,
+ struct strlist **namelist)
{
- int i, fd, ret;
- struct probe_trace_event *tev = NULL;
- struct probe_cache *cache = NULL;
- struct strlist *namelist;
+ int fd;
- fd = probe_file__open(PF_FL_RW | (pev->uprobes ? PF_FL_UPROBE : 0));
+ fd = probe_file__open(PF_FL_RW | (uprobe ? PF_FL_UPROBE : 0));
if (fd < 0)
return fd;
/* Get current event names */
- namelist = probe_file__get_namelist(fd);
- if (!namelist) {
+ *namelist = probe_file__get_namelist(fd);
+ if (!(*namelist)) {
pr_debug("Failed to get current event list.\n");
- ret = -ENOMEM;
- goto close_out;
+ close(fd);
+ return -ENOMEM;
}
+ return fd;
+}
+
+static int __add_probe_trace_events(struct perf_probe_event *pev,
+ struct probe_trace_event *tevs,
+ int ntevs, bool allow_suffix)
+{
+ int i, fd[2] = {-1, -1}, up, ret;
+ struct probe_trace_event *tev = NULL;
+ struct probe_cache *cache = NULL;
+ struct strlist *namelist[2] = {NULL, NULL};
+
+ up = pev->uprobes ? 1 : 0;
+ fd[up] = __open_probe_file_and_namelist(up, &namelist[up]);
+ if (fd[up] < 0)
+ return fd[up];
ret = 0;
for (i = 0; i < ntevs; i++) {
tev = &tevs[i];
+ up = tev->uprobes ? 1 : 0;
+ if (fd[up] == -1) { /* Open the kprobe/uprobe_events */
+ fd[up] = __open_probe_file_and_namelist(up,
+ &namelist[up]);
+ if (fd[up] < 0)
+ goto close_out;
+ }
/* Skip if the symbol is out of .text or blacklisted */
if (!tev->point.symbol && !pev->uprobes)
continue;
/* Set new name for tev (and update namelist) */
- ret = probe_trace_event__set_name(tev, pev, namelist,
+ ret = probe_trace_event__set_name(tev, pev, namelist[up],
allow_suffix);
if (ret < 0)
break;
- ret = probe_file__add_event(fd, tev);
+ ret = probe_file__add_event(fd[up], tev);
if (ret < 0)
break;
@@ -2609,9 +2633,12 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
}
}
- strlist__delete(namelist);
close_out:
- close(fd);
+ for (up = 0; up < 2; up++) {
+ strlist__delete(namelist[up]);
+ if (fd[up] >= 0)
+ close(fd[up]);
+ }
return ret;
}
@@ -2890,6 +2917,141 @@ 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[0] == '/')
+ pev->uprobes = true;
+ }
+
+ return ret;
+}
+
+/* Try to find probe_trace_event from all probe caches */
+static int find_cached_events_all(struct perf_probe_event *pev,
+ struct probe_trace_event **tevs)
+{
+ struct probe_trace_event *tmp_tevs = NULL;
+ struct strlist *bidlist;
+ struct str_node *nd;
+ char *pathname;
+ int ntevs = 0;
+ int ret;
+
+ /* Get the buildid list of all valid caches */
+ ret = build_id_cache__list_all(&bidlist, true);
+ if (ret < 0) {
+ pr_debug("Failed to get buildids: %d\n", ret);
+ return ret;
+ }
+
+ ret = 0;
+ strlist__for_each(nd, bidlist) {
+ pathname = build_id_cache__origname(nd->s);
+ ret = find_cached_events(pev, &tmp_tevs, pathname);
+ /* In the case of cnt == 0, we just skip it */
+ if (ret > 0)
+ ret = concat_probe_trace_events(tevs, &ntevs,
+ &tmp_tevs, ret);
+ free(pathname);
+ if (ret < 0)
+ break;
+ }
+ strlist__delete(bidlist);
+
+ if (ret < 0) {
+ clear_probe_trace_events(*tevs, ntevs);
+ zfree(tevs);
+ } else
+ ret = ntevs;
+
+ return ret;
+}
+
static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,
struct probe_trace_event **tevs)
{
@@ -2899,6 +3061,13 @@ 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 */
+ if (!pev->target)
+ return find_cached_events_all(pev, tevs);
+ else
+ 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-event.h b/tools/perf/util/probe-event.h
index e18ea9f..a027bfe 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -134,6 +134,7 @@ bool perf_probe_event_need_dwarf(struct perf_probe_event *pev);
/* Release event contents */
void clear_perf_probe_event(struct perf_probe_event *pev);
void clear_probe_trace_event(struct probe_trace_event *tev);
+void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs);
/* Command string to line-range */
int parse_line_range_desc(const char *cmd, struct line_range *lr);
diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
index 4d8ba72..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;
@@ -537,7 +563,7 @@ probe_cache__find(struct probe_cache *pcache, struct perf_probe_event *pev)
if (!cmd)
return NULL;
- list_for_each_entry(entry, &pcache->list, list) {
+ for_each_probe_cache_entry(entry, pcache) {
if (pev->sdt) {
if (entry->pev.event &&
streql(entry->pev.event, pev->event) &&
@@ -567,7 +593,7 @@ probe_cache__find_by_name(struct probe_cache *pcache,
{
struct probe_cache_entry *entry = NULL;
- list_for_each_entry(entry, &pcache->list, list) {
+ for_each_probe_cache_entry(entry, pcache) {
/* Hit if same event name or same command-string */
if (streql(entry->pev.group, group) &&
streql(entry->pev.event, event))
@@ -720,7 +746,7 @@ int probe_cache__commit(struct probe_cache *pcache)
if (ret < 0)
goto out;
- list_for_each_entry(entry, &pcache->list, list) {
+ for_each_probe_cache_entry(entry, pcache) {
ret = probe_cache_entry__write(entry, pcache->fd);
pr_debug("Cache committed: %d\n", ret);
if (ret < 0)
@@ -761,7 +787,7 @@ static int probe_cache__show_entries(struct probe_cache *pcache,
{
struct probe_cache_entry *entry;
- list_for_each_entry(entry, &pcache->list, list) {
+ for_each_probe_cache_entry(entry, pcache) {
if (probe_cache_entry__compare(entry, filter))
printf("%s\n", entry->spev);
}
diff --git a/tools/perf/util/probe-file.h b/tools/perf/util/probe-file.h
index ce98162..0faf083 100644
--- a/tools/perf/util/probe-file.h
+++ b/tools/perf/util/probe-file.h
@@ -21,6 +21,8 @@ struct probe_cache {
#define PF_FL_UPROBE 1
#define PF_FL_RW 2
+#define for_each_probe_cache_entry(entry, pcache) \
+ list_for_each_entry(entry, &pcache->list, list)
/* probe-file.c depends on libelf */
#ifdef HAVE_LIBELF_SUPPORT
@@ -34,6 +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 | 2016-05-28 17:20 +0200 |
| Subject | [PATCH perf/core v9 10/16] perf buildid-cache: Scan and import user SDT events to probe cache |
| Message-ID | <rDObV-25o-45@gated-at.bofh.it> |
| In reply to | #1408482 |
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 v4:
- Fix a bug to copy correct group name to entries.
- Fix to consolidate same-name entries.
---
tools/perf/util/build-id.c | 27 +++++++++++++++--
tools/perf/util/probe-file.c | 67 ++++++++++++++++++++++++++++++++++++++++--
tools/perf/util/probe-file.h | 2 +
3 files changed, 90 insertions(+), 6 deletions(-)
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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| From | Namhyung Kim <namhyung@kernel.org> |
|---|---|
| Date | 2016-05-30 06:00 +0200 |
| Message-ID | <rEmwW-7g1-5@gated-at.bofh.it> |
| In reply to | #1408482 |
Hi Masami, On Sun, May 29, 2016 at 12:15:01AM +0900, Masami Hiramatsu wrote: > Hi, > > Here is the 9th version of the patchset for probe-cache and > initial SDT support. > > The previous version is here; https://lkml.org/lkml/2016/5/14/107 > > This version just fixes 2 points according to Hemant's comment, > and split out the filename__readable() patch. > > Changes in v9: > - [1/16,2/16] split out the filename__readable() > - [7/16] Fix to show which event is deleted. > - [12/16] Update list_usage to show sdt option. > > Thank you, Thanks for doing this, I hope this gets merged soon. The patch 4 and 14 look a bit larger and would be better to be splitted IMHO. Other than that, all look good to me. Acked-by: Namhyung Kim <namhyung@kernel.org> Thanks, Namhyung > > --- > > Hemant Kumar (1): > perf/sdt: ELF support for SDT > > Masami Hiramatsu (15): > perf-symbol: Introduce filename__readable to check readability > perf symbol: Cleanup the code flow of dso__find_kallsyms > perf-buildid-cache: Use path/to/bin/buildid/elf instead of path/to/bin/buildid > 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: Allow wildcard for cached events > perf probe: Support @BUILDID or @FILE suffix for SDT events > perf probe: Support a special SDT probe format > > > tools/perf/Documentation/perf-probe.txt | 26 +- > tools/perf/builtin-list.c | 6 > tools/perf/builtin-probe.c | 30 ++ > tools/perf/util/build-id.c | 295 ++++++++++++++++-- > tools/perf/util/build-id.h | 8 > tools/perf/util/dso.h | 5 > tools/perf/util/parse-events.c | 83 +++++ > tools/perf/util/parse-events.h | 2 > tools/perf/util/probe-event.c | 492 +++++++++++++++++++++++++++--- > tools/perf/util/probe-event.h | 7 > 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.c | 71 ++-- > tools/perf/util/symbol.h | 22 + > 15 files changed, 1712 insertions(+), 132 deletions(-) > > -- > Masami Hiramatsu
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| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-05-30 16:40 +0200 |
| Message-ID | <rEwwi-5os-37@gated-at.bofh.it> |
| In reply to | #1408750 |
On Mon, 30 May 2016 12:54:58 +0900 Namhyung Kim <namhyung@kernel.org> wrote: > Hi Masami, > > On Sun, May 29, 2016 at 12:15:01AM +0900, Masami Hiramatsu wrote: > > Hi, > > > > Here is the 9th version of the patchset for probe-cache and > > initial SDT support. > > > > The previous version is here; https://lkml.org/lkml/2016/5/14/107 > > > > This version just fixes 2 points according to Hemant's comment, > > and split out the filename__readable() patch. > > > > Changes in v9: > > - [1/16,2/16] split out the filename__readable() > > - [7/16] Fix to show which event is deleted. > > - [12/16] Update list_usage to show sdt option. > > > > Thank you, > > Thanks for doing this, I hope this gets merged soon. The patch 4 and > 14 look a bit larger and would be better to be splitted IMHO. Other > than that, all look good to me. Yeah, it seems 14/16 can be splitted, but 4/16 might not be. When I need to update to v10, I'll try. > > Acked-by: Namhyung Kim <namhyung@kernel.org> Thanks! > > Thanks, > Namhyung > > > > > > --- > > > > Hemant Kumar (1): > > perf/sdt: ELF support for SDT > > > > Masami Hiramatsu (15): > > perf-symbol: Introduce filename__readable to check readability > > perf symbol: Cleanup the code flow of dso__find_kallsyms > > perf-buildid-cache: Use path/to/bin/buildid/elf instead of path/to/bin/buildid > > 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: Allow wildcard for cached events > > perf probe: Support @BUILDID or @FILE suffix for SDT events > > perf probe: Support a special SDT probe format > > > > > > tools/perf/Documentation/perf-probe.txt | 26 +- > > tools/perf/builtin-list.c | 6 > > tools/perf/builtin-probe.c | 30 ++ > > tools/perf/util/build-id.c | 295 ++++++++++++++++-- > > tools/perf/util/build-id.h | 8 > > tools/perf/util/dso.h | 5 > > tools/perf/util/parse-events.c | 83 +++++ > > tools/perf/util/parse-events.h | 2 > > tools/perf/util/probe-event.c | 492 +++++++++++++++++++++++++++--- > > tools/perf/util/probe-event.h | 7 > > 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.c | 71 ++-- > > tools/perf/util/symbol.h | 22 + > > 15 files changed, 1712 insertions(+), 132 deletions(-) > > > > -- > > Masami Hiramatsu -- Masami Hiramatsu <mhiramat@kernel.org>
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| From | Arnaldo Carvalho de Melo <acme@kernel.org> |
|---|---|
| Date | 2016-05-30 18:20 +0200 |
| Message-ID | <rEy55-6xL-31@gated-at.bofh.it> |
| In reply to | #1408750 |
Em Mon, May 30, 2016 at 12:54:58PM +0900, Namhyung Kim escreveu: > Hi Masami, > > On Sun, May 29, 2016 at 12:15:01AM +0900, Masami Hiramatsu wrote: > > Hi, > > > > Here is the 9th version of the patchset for probe-cache and > > initial SDT support. > > > > The previous version is here; https://lkml.org/lkml/2016/5/14/107 > > > > This version just fixes 2 points according to Hemant's comment, > > and split out the filename__readable() patch. > > > > Changes in v9: > > - [1/16,2/16] split out the filename__readable() > > - [7/16] Fix to show which event is deleted. > > - [12/16] Update list_usage to show sdt option. > > > > Thank you, > > Thanks for doing this, I hope this gets merged soon. The patch 4 and > 14 look a bit larger and would be better to be splitted IMHO. Other > than that, all look good to me. > > Acked-by: Namhyung Kim <namhyung@kernel.org> Agreed, please split both patches, I applied 1-3, please resend from 4 onwards. - Arnaldo
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| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2016-05-31 11:10 +0200 |
| Message-ID | <rENQt-Jk-13@gated-at.bofh.it> |
| In reply to | #1409266 |
On Mon, 30 May 2016 13:10:20 -0300 Arnaldo Carvalho de Melo <acme@kernel.org> wrote: > Em Mon, May 30, 2016 at 12:54:58PM +0900, Namhyung Kim escreveu: > > Hi Masami, > > > > On Sun, May 29, 2016 at 12:15:01AM +0900, Masami Hiramatsu wrote: > > > Hi, > > > > > > Here is the 9th version of the patchset for probe-cache and > > > initial SDT support. > > > > > > The previous version is here; https://lkml.org/lkml/2016/5/14/107 > > > > > > This version just fixes 2 points according to Hemant's comment, > > > and split out the filename__readable() patch. > > > > > > Changes in v9: > > > - [1/16,2/16] split out the filename__readable() > > > - [7/16] Fix to show which event is deleted. > > > - [12/16] Update list_usage to show sdt option. > > > > > > Thank you, > > > > Thanks for doing this, I hope this gets merged soon. The patch 4 and > > 14 look a bit larger and would be better to be splitted IMHO. Other > > than that, all look good to me. > > > > Acked-by: Namhyung Kim <namhyung@kernel.org> > > Agreed, please split both patches, I applied 1-3, please resend from 4 > onwards. Hmm, for patch#4, it includes A. Rename and Export build_id_cache__cachedir() [14 LOC] B. Add perf_probe_event__copy() [73 LOC] C. Add (or fix and reenable) synthesize_perf_probe_point() [38 LOC] D. Introduce perf_cache interfaces (new/add/commit/delete) [320 LOC] E. Add --cache option for perf-probe [15 LOC] And E depends on D, D depends on A,B and C. And of course without E, other parts are just a deadweight.(no other one call it, just exported) Should I split them all? Thank you, > > - Arnaldo -- Masami Hiramatsu <mhiramat@kernel.org>
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| From | Arnaldo Carvalho de Melo <acme@kernel.org> |
|---|---|
| Date | 2016-05-31 15:50 +0200 |
| Message-ID | <rESdr-3nT-9@gated-at.bofh.it> |
| In reply to | #1410014 |
Em Tue, May 31, 2016 at 06:01:28PM +0900, Masami Hiramatsu escreveu: > On Mon, 30 May 2016 13:10:20 -0300 > Arnaldo Carvalho de Melo <acme@kernel.org> wrote: > > Em Mon, May 30, 2016 at 12:54:58PM +0900, Namhyung Kim escreveu: > > > On Sun, May 29, 2016 at 12:15:01AM +0900, Masami Hiramatsu wrote: > > > > Here is the 9th version of the patchset for probe-cache and > > > > initial SDT support. > > > > The previous version is here; https://lkml.org/lkml/2016/5/14/107 > > > > This version just fixes 2 points according to Hemant's comment, > > > > and split out the filename__readable() patch. > > > > Changes in v9: > > > > - [1/16,2/16] split out the filename__readable() > > > > - [7/16] Fix to show which event is deleted. > > > > - [12/16] Update list_usage to show sdt option. > > > Thanks for doing this, I hope this gets merged soon. The patch 4 and > > > 14 look a bit larger and would be better to be splitted IMHO. Other > > > than that, all look good to me. > > > Acked-by: Namhyung Kim <namhyung@kernel.org> > > Agreed, please split both patches, I applied 1-3, please resend from 4 > > onwards. > Hmm, for patch#4, it includes > A. Rename and Export build_id_cache__cachedir() [14 LOC] > B. Add perf_probe_event__copy() [73 LOC] > C. Add (or fix and reenable) synthesize_perf_probe_point() [38 LOC] > D. Introduce perf_cache interfaces (new/add/commit/delete) [320 LOC] > E. Add --cache option for perf-probe [15 LOC] > And E depends on D, D depends on A,B and C. And of course without E, > other parts are just a deadweight.(no other one call it, just exported) > Should I split them all? Please. - Arnaldo
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| From | Arnaldo Carvalho de Melo <acme@kernel.org> |
|---|---|
| Date | 2016-05-30 18:30 +0200 |
| Message-ID | <rEyeJ-6B4-7@gated-at.bofh.it> |
| In reply to | #1408482 |
Em Sun, May 29, 2016 at 12:15:01AM +0900, Masami Hiramatsu escreveu: > Hi, > > Here is the 9th version of the patchset for probe-cache and > initial SDT support. Ok, for completeness sake: Where does one learn more about "SDT", I couldn't find a description of this in this patchkit, /me goes googling around... - Arnaldo > The previous version is here; https://lkml.org/lkml/2016/5/14/107 > > This version just fixes 2 points according to Hemant's comment, > and split out the filename__readable() patch. > > Changes in v9: > - [1/16,2/16] split out the filename__readable() > - [7/16] Fix to show which event is deleted. > - [12/16] Update list_usage to show sdt option. > > Thank you, > > --- > > Hemant Kumar (1): > perf/sdt: ELF support for SDT > > Masami Hiramatsu (15): > perf-symbol: Introduce filename__readable to check readability > perf symbol: Cleanup the code flow of dso__find_kallsyms > perf-buildid-cache: Use path/to/bin/buildid/elf instead of path/to/bin/buildid > 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: Allow wildcard for cached events > perf probe: Support @BUILDID or @FILE suffix for SDT events > perf probe: Support a special SDT probe format > > > tools/perf/Documentation/perf-probe.txt | 26 +- > tools/perf/builtin-list.c | 6 > tools/perf/builtin-probe.c | 30 ++ > tools/perf/util/build-id.c | 295 ++++++++++++++++-- > tools/perf/util/build-id.h | 8 > tools/perf/util/dso.h | 5 > tools/perf/util/parse-events.c | 83 +++++ > tools/perf/util/parse-events.h | 2 > tools/perf/util/probe-event.c | 492 +++++++++++++++++++++++++++--- > tools/perf/util/probe-event.h | 7 > 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.c | 71 ++-- > tools/perf/util/symbol.h | 22 + > 15 files changed, 1712 insertions(+), 132 deletions(-) > > -- > Masami Hiramatsu
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| From | Arnaldo Carvalho de Melo <acme@kernel.org> |
|---|---|
| Date | 2016-05-30 18:40 +0200 |
| Message-ID | <rEyoq-6Ev-15@gated-at.bofh.it> |
| In reply to | #1409267 |
Em Mon, May 30, 2016 at 01:22:52PM -0300, Arnaldo Carvalho de Melo escreveu: > Em Sun, May 29, 2016 at 12:15:01AM +0900, Masami Hiramatsu escreveu: > > Hi, > > > > Here is the 9th version of the patchset for probe-cache and > > initial SDT support. > > Ok, for completeness sake: Where does one learn more about "SDT", I > couldn't find a description of this in this patchkit, /me goes googling > around... https://sourceware.org/gdb/onlinedocs/gdb/Static-Probe-Points.html Some lifting of this text, giving credit and checking whatever license it is under would help, I think. Mentioning some userland components that have such "Statically Defined Tracing" markers would also help testers to try it with this patchkit, I saw just one or two examples here, IIRC with libc and libstdc++. - Arnaldo > - Arnaldo > > > The previous version is here; https://lkml.org/lkml/2016/5/14/107 > > > > This version just fixes 2 points according to Hemant's comment, > > and split out the filename__readable() patch. > > > > Changes in v9: > > - [1/16,2/16] split out the filename__readable() > > - [7/16] Fix to show which event is deleted. > > - [12/16] Update list_usage to show sdt option. > > > > Thank you, > > > > --- > > > > Hemant Kumar (1): > > perf/sdt: ELF support for SDT > > > > Masami Hiramatsu (15): > > perf-symbol: Introduce filename__readable to check readability > > perf symbol: Cleanup the code flow of dso__find_kallsyms > > perf-buildid-cache: Use path/to/bin/buildid/elf instead of path/to/bin/buildid > > 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: Allow wildcard for cached events > > perf probe: Support @BUILDID or @FILE suffix for SDT events > > perf probe: Support a special SDT probe format > > > > > > tools/perf/Documentation/perf-probe.txt | 26 +- > > tools/perf/builtin-list.c | 6 > > tools/perf/builtin-probe.c | 30 ++ > > tools/perf/util/build-id.c | 295 ++++++++++++++++-- > > tools/perf/util/build-id.h | 8 > > tools/perf/util/dso.h | 5 > > tools/perf/util/parse-events.c | 83 +++++ > > tools/perf/util/parse-events.h | 2 > > tools/perf/util/probe-event.c | 492 +++++++++++++++++++++++++++--- > > tools/perf/util/probe-event.h | 7 > > 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.c | 71 ++-- > > tools/perf/util/symbol.h | 22 + > > 15 files changed, 1712 insertions(+), 132 deletions(-) > > > > -- > > Masami Hiramatsu
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