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[GIT PULL 0/8] perf/core improvements and fixes

Started byArnaldo Carvalho de Melo <acme@kernel.org>
First post2015-09-15 17:30 +0200
Last post2015-09-16 16:00 +0200
Articles 8 — 2 participants

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  [GIT PULL 0/8] perf/core improvements and fixes Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-15 17:30 +0200
    [PATCH 5/8] perf evsel: Propagate error info from tp_format Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-15 17:30 +0200
    [PATCH 1/8] perf probe: Free perf_probe_event in cleanup_perf_probe_events() Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-15 17:40 +0200
    [PATCH 4/8] perf tools: Propagate error info for the tracepoint parsing Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-15 17:40 +0200
    [PATCH 3/8] tools: Add err.h with ERR_PTR PTR_ERR interface Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-15 17:40 +0200
    [PATCH 2/8] perf probe: Export init/exit_probe_symbol_maps() Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-15 17:40 +0200
    Re: [GIT PULL 0/8] perf/core improvements and fixes Ingo Molnar <mingo@kernel.org> - 2015-09-16 09:30 +0200
      Re: [GIT PULL 0/8] perf/core improvements and fixes Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-16 16:00 +0200

#1225314 — [GIT PULL 0/8] perf/core improvements and fixes

FromArnaldo Carvalho de Melo <acme@kernel.org>
Date2015-09-15 17:30 +0200
Subject[GIT PULL 0/8] perf/core improvements and fixes
Message-ID<q90lc-mc-15@gated-at.bofh.it>
Hi Ingo,

	Please consider pulling,

- Arnaldo

The following changes since commit 9059b284caecb628fac826c2c5cc8ee85708eec1:

  Merge tag 'perf-core-for-mingo-2' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core (2015-09-15 08:50:59 +0200)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git tags/perf-core-for-mingo

for you to fetch changes up to bbbe6bf6037d77816c4a19aaf35f4cecf662b49a:

  perf tools: Introduce regs_query_register_offset() for x86 (2015-09-15 09:48:33 -0300)

----------------------------------------------------------------
perf/core improvements and fixes:

User visible:

- Enhance the error reporting of tracepoint event parsing, e.g.:

    $ oldperf record -e sched:sched_switc usleep 1
    event syntax error: 'sched:sched_switc'
                        \___ unknown tracepoint
    Run 'perf list' for a list of valid events

  Now we get the much nicer:

    $ perf record -e sched:sched_switc ls
    event syntax error: 'sched:sched_switc'
                         \___ can't access trace events

    Error: No permissions to read /sys/kernel/debug/tracing/events/sched/sched_switc
    Hint:  Try 'sudo mount -o remount,mode=755 /sys/kernel/debug'

  And after we have those mount point permissions fixed:

    $ perf record -e sched:sched_switc ls
    event syntax error: 'sched:sched_switc'
                         \___ unknown tracepoint

    Error: File /sys/kernel/debug/tracing/events/sched/sched_switc not found.
    Hint:  Perhaps this kernel misses some CONFIG_ setting to enable this feature?.

  Now its just a matter of using what git uses to suggest alternatives when we
  make a typo, i.e. that it is just an 'h' missing :-)

  I.e. basically now the event parsing routing uses the strerror_open()
  routines introduced by and used in 'perf trace' work. (Jiri Olsa)

Infrastructure:

- Export init/exit_probe_symbol_maps() from 'perf probe' for use in eBPF
  (Namhyung Kim)

- Free perf_probe_event in cleanup_perf_probe_events() (Namhyung Kim)

- regs_query_register_offset() infrastructure + implementation for x86.
  First user will be the perf/eBPF code (Wang Nan)

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

----------------------------------------------------------------
Jiri Olsa (4):
      tools: Add err.h with ERR_PTR PTR_ERR interface
      perf tools: Propagate error info for the tracepoint parsing
      perf evsel: Propagate error info from tp_format
      perf tools: Enhance parsing events tracepoint error output

Namhyung Kim (2):
      perf probe: Free perf_probe_event in cleanup_perf_probe_events()
      perf probe: Export init/exit_probe_symbol_maps()

Wang Nan (2):
      perf tools: regs_query_register_offset() infrastructure
      perf tools: Introduce regs_query_register_offset() for x86

 tools/include/linux/err.h                   |  49 +++++++++++
 tools/perf/arch/x86/Makefile                |   1 +
 tools/perf/arch/x86/util/dwarf-regs.c       | 122 ++++++++++++++++++++--------
 tools/perf/builtin-probe.c                  |   5 ++
 tools/perf/builtin-trace.c                  |  19 +++--
 tools/perf/config/Makefile                  |   4 +
 tools/perf/tests/evsel-tp-sched.c           |  10 ++-
 tools/perf/tests/mmap-basic.c               |   3 +-
 tools/perf/tests/openat-syscall-all-cpus.c  |   3 +-
 tools/perf/tests/openat-syscall-tp-fields.c |   3 +-
 tools/perf/tests/openat-syscall.c           |   3 +-
 tools/perf/util/evlist.c                    |   3 +-
 tools/perf/util/evsel.c                     |  16 +++-
 tools/perf/util/evsel.h                     |   3 +
 tools/perf/util/include/dwarf-regs.h        |   8 ++
 tools/perf/util/parse-events.c              |  66 +++++++++++----
 tools/perf/util/parse-events.h              |   3 +-
 tools/perf/util/parse-events.y              |  16 ++--
 tools/perf/util/probe-event.c               |  32 ++++----
 tools/perf/util/probe-event.h               |   2 +
 tools/perf/util/trace-event.c               |  15 +++-
 21 files changed, 291 insertions(+), 95 deletions(-)
 create mode 100644 tools/include/linux/err.h
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#1225316 — [PATCH 5/8] perf evsel: Propagate error info from tp_format

FromArnaldo Carvalho de Melo <acme@kernel.org>
Date2015-09-15 17:30 +0200
Subject[PATCH 5/8] perf evsel: Propagate error info from tp_format
Message-ID<q90le-mc-63@gated-at.bofh.it>
In reply to#1225314
From: Jiri Olsa <jolsa@kernel.org>

Propagate error info from tp_format via ERR_PTR to get it all the way
down to the parse-event.c tracepoint adding routines. Following
functions now return pointer with encoded error:

  - tp_format
  - trace_event__tp_format
  - perf_evsel__newtp_idx
  - perf_evsel__newtp

This affects several other places in perf, that cannot use pointer check
anymore, but must utilize the err.h interface, when getting error
information from above functions list.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Raphael Beamonte <raphael.beamonte@gmail.com>
Link: http://lkml.kernel.org/r/1441615087-13886-5-git-send-email-jolsa@kernel.org
[ Add two missing ERR_PTR() and one IS_ERR() ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/builtin-trace.c                  | 19 +++++++++++--------
 tools/perf/tests/evsel-tp-sched.c           | 10 ++++++++--
 tools/perf/tests/mmap-basic.c               |  3 ++-
 tools/perf/tests/openat-syscall-all-cpus.c  |  3 ++-
 tools/perf/tests/openat-syscall-tp-fields.c |  3 ++-
 tools/perf/tests/openat-syscall.c           |  3 ++-
 tools/perf/util/evlist.c                    |  3 ++-
 tools/perf/util/evsel.c                     | 16 +++++++++++++---
 tools/perf/util/evsel.h                     |  3 +++
 tools/perf/util/parse-events.c              |  6 +++---
 tools/perf/util/trace-event.c               | 15 ++++++++++++---
 11 files changed, 60 insertions(+), 24 deletions(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 215653274102..93b80f12f35e 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -38,6 +38,7 @@
 #include <stdlib.h>
 #include <sys/mman.h>
 #include <linux/futex.h>
+#include <linux/err.h>
 
 /* For older distros: */
 #ifndef MAP_STACK
@@ -245,13 +246,14 @@ static struct perf_evsel *perf_evsel__syscall_newtp(const char *direction, void
 	struct perf_evsel *evsel = perf_evsel__newtp("raw_syscalls", direction);
 
 	/* older kernel (e.g., RHEL6) use syscalls:{enter,exit} */
-	if (evsel == NULL)
+	if (IS_ERR(evsel))
 		evsel = perf_evsel__newtp("syscalls", direction);
 
-	if (evsel) {
-		if (perf_evsel__init_syscall_tp(evsel, handler))
-			goto out_delete;
-	}
+	if (IS_ERR(evsel))
+		return NULL;
+
+	if (perf_evsel__init_syscall_tp(evsel, handler))
+		goto out_delete;
 
 	return evsel;
 
@@ -1705,12 +1707,12 @@ static int trace__read_syscall_info(struct trace *trace, int id)
 	snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->name);
 	sc->tp_format = trace_event__tp_format("syscalls", tp_name);
 
-	if (sc->tp_format == NULL && sc->fmt && sc->fmt->alias) {
+	if (IS_ERR(sc->tp_format) && sc->fmt && sc->fmt->alias) {
 		snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->fmt->alias);
 		sc->tp_format = trace_event__tp_format("syscalls", tp_name);
 	}
 
-	if (sc->tp_format == NULL)
+	if (IS_ERR(sc->tp_format))
 		return -1;
 
 	sc->args = sc->tp_format->format.fields;
@@ -2390,7 +2392,8 @@ static size_t trace__fprintf_thread_summary(struct trace *trace, FILE *fp);
 static bool perf_evlist__add_vfs_getname(struct perf_evlist *evlist)
 {
 	struct perf_evsel *evsel = perf_evsel__newtp("probe", "vfs_getname");
-	if (evsel == NULL)
+
+	if (IS_ERR(evsel))
 		return false;
 
 	if (perf_evsel__field(evsel, "pathname") == NULL) {
diff --git a/tools/perf/tests/evsel-tp-sched.c b/tools/perf/tests/evsel-tp-sched.c
index 52162425c969..790e413d9a1f 100644
--- a/tools/perf/tests/evsel-tp-sched.c
+++ b/tools/perf/tests/evsel-tp-sched.c
@@ -1,3 +1,4 @@
+#include <linux/err.h>
 #include <traceevent/event-parse.h>
 #include "evsel.h"
 #include "tests.h"
@@ -36,8 +37,8 @@ int test__perf_evsel__tp_sched_test(void)
 	struct perf_evsel *evsel = perf_evsel__newtp("sched", "sched_switch");
 	int ret = 0;
 
-	if (evsel == NULL) {
-		pr_debug("perf_evsel__new\n");
+	if (IS_ERR(evsel)) {
+		pr_debug("perf_evsel__newtp failed with %ld\n", PTR_ERR(evsel));
 		return -1;
 	}
 
@@ -66,6 +67,11 @@ int test__perf_evsel__tp_sched_test(void)
 
 	evsel = perf_evsel__newtp("sched", "sched_wakeup");
 
+	if (IS_ERR(evsel)) {
+		pr_debug("perf_evsel__newtp failed with %ld\n", PTR_ERR(evsel));
+		return -1;
+	}
+
 	if (perf_evsel__test_field(evsel, "comm", 16, true))
 		ret = -1;
 
diff --git a/tools/perf/tests/mmap-basic.c b/tools/perf/tests/mmap-basic.c
index 666b67a4df9d..4495493c9431 100644
--- a/tools/perf/tests/mmap-basic.c
+++ b/tools/perf/tests/mmap-basic.c
@@ -3,6 +3,7 @@
 #include "thread_map.h"
 #include "cpumap.h"
 #include "tests.h"
+#include <linux/err.h>
 
 /*
  * This test will generate random numbers of calls to some getpid syscalls,
@@ -65,7 +66,7 @@ int test__basic_mmap(void)
 
 		snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);
 		evsels[i] = perf_evsel__newtp("syscalls", name);
-		if (evsels[i] == NULL) {
+		if (IS_ERR(evsels[i])) {
 			pr_debug("perf_evsel__new\n");
 			goto out_delete_evlist;
 		}
diff --git a/tools/perf/tests/openat-syscall-all-cpus.c b/tools/perf/tests/openat-syscall-all-cpus.c
index 495d8126b722..9e104a2e973d 100644
--- a/tools/perf/tests/openat-syscall-all-cpus.c
+++ b/tools/perf/tests/openat-syscall-all-cpus.c
@@ -1,4 +1,5 @@
 #include <api/fs/fs.h>
+#include <linux/err.h>
 #include "evsel.h"
 #include "tests.h"
 #include "thread_map.h"
@@ -31,7 +32,7 @@ int test__openat_syscall_event_on_all_cpus(void)
 	CPU_ZERO(&cpu_set);
 
 	evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
-	if (evsel == NULL) {
+	if (IS_ERR(evsel)) {
 		tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat");
 		pr_err("%s\n", errbuf);
 		goto out_thread_map_delete;
diff --git a/tools/perf/tests/openat-syscall-tp-fields.c b/tools/perf/tests/openat-syscall-tp-fields.c
index 01a19626c846..473d3869727e 100644
--- a/tools/perf/tests/openat-syscall-tp-fields.c
+++ b/tools/perf/tests/openat-syscall-tp-fields.c
@@ -1,3 +1,4 @@
+#include <linux/err.h>
 #include "perf.h"
 #include "evlist.h"
 #include "evsel.h"
@@ -30,7 +31,7 @@ int test__syscall_openat_tp_fields(void)
 	}
 
 	evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
-	if (evsel == NULL) {
+	if (IS_ERR(evsel)) {
 		pr_debug("%s: perf_evsel__newtp\n", __func__);
 		goto out_delete_evlist;
 	}
diff --git a/tools/perf/tests/openat-syscall.c b/tools/perf/tests/openat-syscall.c
index 08ac9d94a050..7b1db8306098 100644
--- a/tools/perf/tests/openat-syscall.c
+++ b/tools/perf/tests/openat-syscall.c
@@ -1,4 +1,5 @@
 #include <api/fs/tracing_path.h>
+#include <linux/err.h>
 #include "thread_map.h"
 #include "evsel.h"
 #include "debug.h"
@@ -19,7 +20,7 @@ int test__openat_syscall_event(void)
 	}
 
 	evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
-	if (evsel == NULL) {
+	if (IS_ERR(evsel)) {
 		tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat");
 		pr_err("%s\n", errbuf);
 		goto out_thread_map_delete;
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index d51a5200c8af..3cb2bf9bd4bd 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -25,6 +25,7 @@
 #include <linux/bitops.h>
 #include <linux/hash.h>
 #include <linux/log2.h>
+#include <linux/err.h>
 
 static void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx);
 static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx);
@@ -265,7 +266,7 @@ int perf_evlist__add_newtp(struct perf_evlist *evlist,
 {
 	struct perf_evsel *evsel = perf_evsel__newtp(sys, name);
 
-	if (evsel == NULL)
+	if (IS_ERR(evsel))
 		return -1;
 
 	evsel->handler = handler;
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 771ade4d5966..6b5d1b509148 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -13,6 +13,7 @@
 #include <traceevent/event-parse.h>
 #include <linux/hw_breakpoint.h>
 #include <linux/perf_event.h>
+#include <linux/err.h>
 #include <sys/resource.h>
 #include "asm/bug.h"
 #include "callchain.h"
@@ -225,11 +226,17 @@ struct perf_evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)
 	return evsel;
 }
 
+/*
+ * Returns pointer with encoded error via <linux/err.h> interface.
+ */
 struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx)
 {
 	struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
+	int err = -ENOMEM;
 
-	if (evsel != NULL) {
+	if (evsel == NULL) {
+		goto out_err;
+	} else {
 		struct perf_event_attr attr = {
 			.type	       = PERF_TYPE_TRACEPOINT,
 			.sample_type   = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
@@ -240,8 +247,10 @@ struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int
 			goto out_free;
 
 		evsel->tp_format = trace_event__tp_format(sys, name);
-		if (evsel->tp_format == NULL)
+		if (IS_ERR(evsel->tp_format)) {
+			err = PTR_ERR(evsel->tp_format);
 			goto out_free;
+		}
 
 		event_attr_init(&attr);
 		attr.config = evsel->tp_format->id;
@@ -254,7 +263,8 @@ struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int
 out_free:
 	zfree(&evsel->name);
 	free(evsel);
-	return NULL;
+out_err:
+	return ERR_PTR(err);
 }
 
 const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index f164a149da82..62ab307b7306 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -160,6 +160,9 @@ static inline struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr)
 
 struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx);
 
+/*
+ * Returns pointer with encoded error via <linux/err.h> interface.
+ */
 static inline struct perf_evsel *perf_evsel__newtp(const char *sys, const char *name)
 {
 	return perf_evsel__newtp_idx(sys, name, 0);
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 1b284b8ad243..c47831c47220 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1,4 +1,5 @@
 #include <linux/hw_breakpoint.h>
+#include <linux/err.h>
 #include "util.h"
 #include "../perf.h"
 #include "evlist.h"
@@ -393,11 +394,10 @@ static int add_tracepoint(struct list_head *list, int *idx,
 	struct perf_evsel *evsel;
 
 	evsel = perf_evsel__newtp_idx(sys_name, evt_name, (*idx)++);
-	if (!evsel)
-		return -ENOMEM;
+	if (IS_ERR(evsel))
+		return PTR_ERR(evsel);
 
 	list_add_tail(&evsel->node, list);
-
 	return 0;
 }
 
diff --git a/tools/perf/util/trace-event.c b/tools/perf/util/trace-event.c
index 2f4996ab313d..802bb868d446 100644
--- a/tools/perf/util/trace-event.c
+++ b/tools/perf/util/trace-event.c
@@ -7,6 +7,7 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <linux/kernel.h>
+#include <linux/err.h>
 #include <traceevent/event-parse.h>
 #include <api/fs/tracing_path.h>
 #include "trace-event.h"
@@ -66,6 +67,9 @@ void trace_event__cleanup(struct trace_event *t)
 	pevent_free(t->pevent);
 }
 
+/*
+ * Returns pointer with encoded error via <linux/err.h> interface.
+ */
 static struct event_format*
 tp_format(const char *sys, const char *name)
 {
@@ -74,12 +78,14 @@ tp_format(const char *sys, const char *name)
 	char path[PATH_MAX];
 	size_t size;
 	char *data;
+	int err;
 
 	scnprintf(path, PATH_MAX, "%s/%s/%s/format",
 		  tracing_events_path, sys, name);
 
-	if (filename__read_str(path, &data, &size))
-		return NULL;
+	err = filename__read_str(path, &data, &size);
+	if (err)
+		return ERR_PTR(err);
 
 	pevent_parse_format(pevent, &event, data, size, sys);
 
@@ -87,11 +93,14 @@ tp_format(const char *sys, const char *name)
 	return event;
 }
 
+/*
+ * Returns pointer with encoded error via <linux/err.h> interface.
+ */
 struct event_format*
 trace_event__tp_format(const char *sys, const char *name)
 {
 	if (!tevent_initialized && trace_event__init2())
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 
 	return tp_format(sys, name);
 }
-- 
2.1.0

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#1225317 — [PATCH 1/8] perf probe: Free perf_probe_event in cleanup_perf_probe_events()

FromArnaldo Carvalho de Melo <acme@kernel.org>
Date2015-09-15 17:40 +0200
Subject[PATCH 1/8] perf probe: Free perf_probe_event in cleanup_perf_probe_events()
Message-ID<q90uR-xv-1@gated-at.bofh.it>
In reply to#1225314
From: Namhyung Kim <namhyung@kernel.org>

The cleanup_perf_probe_events() frees all resources related to a perf
probe event.  However it only freed resources in trace probe events, not
perf probe events.  So call clear_perf_probe_event() too.

Reported-by: Wang Nan <wangnan0@huawei.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1441852026-28974-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/probe-event.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 5964eccbe94d..3d7d60cc6f16 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2792,6 +2792,7 @@ void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs)
 			clear_probe_trace_event(&pevs[i].tevs[j]);
 		zfree(&pevs[i].tevs);
 		pevs[i].ntevs = 0;
+		clear_perf_probe_event(&pevs[i]);
 	}
 
 	exit_symbol_maps();
-- 
2.1.0

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#1225323 — [PATCH 4/8] perf tools: Propagate error info for the tracepoint parsing

FromArnaldo Carvalho de Melo <acme@kernel.org>
Date2015-09-15 17:40 +0200
Subject[PATCH 4/8] perf tools: Propagate error info for the tracepoint parsing
Message-ID<q90uR-xv-11@gated-at.bofh.it>
In reply to#1225314
From: Jiri Olsa <jolsa@kernel.org>

Pass 'struct parse_events_error *error' to the parse-event.c tracepoint
adding path. It will be filled with error data in following patches.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Reviewed-by: Raphael Beamonte <raphael.beamonte@gmail.com>
Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1441615087-13886-4-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/parse-events.c | 27 ++++++++++++++++-----------
 tools/perf/util/parse-events.h |  3 ++-
 tools/perf/util/parse-events.y |  4 ++--
 3 files changed, 20 insertions(+), 14 deletions(-)

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 3840176642f8..1b284b8ad243 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -387,7 +387,8 @@ int parse_events_add_cache(struct list_head *list, int *idx,
 }
 
 static int add_tracepoint(struct list_head *list, int *idx,
-			  char *sys_name, char *evt_name)
+			  char *sys_name, char *evt_name,
+			  struct parse_events_error *error __maybe_unused)
 {
 	struct perf_evsel *evsel;
 
@@ -401,7 +402,8 @@ static int add_tracepoint(struct list_head *list, int *idx,
 }
 
 static int add_tracepoint_multi_event(struct list_head *list, int *idx,
-				      char *sys_name, char *evt_name)
+				      char *sys_name, char *evt_name,
+				      struct parse_events_error *error)
 {
 	char evt_path[MAXPATHLEN];
 	struct dirent *evt_ent;
@@ -425,7 +427,7 @@ static int add_tracepoint_multi_event(struct list_head *list, int *idx,
 		if (!strglobmatch(evt_ent->d_name, evt_name))
 			continue;
 
-		ret = add_tracepoint(list, idx, sys_name, evt_ent->d_name);
+		ret = add_tracepoint(list, idx, sys_name, evt_ent->d_name, error);
 	}
 
 	closedir(evt_dir);
@@ -433,15 +435,17 @@ static int add_tracepoint_multi_event(struct list_head *list, int *idx,
 }
 
 static int add_tracepoint_event(struct list_head *list, int *idx,
-				char *sys_name, char *evt_name)
+				char *sys_name, char *evt_name,
+				struct parse_events_error *error)
 {
 	return strpbrk(evt_name, "*?") ?
-	       add_tracepoint_multi_event(list, idx, sys_name, evt_name) :
-	       add_tracepoint(list, idx, sys_name, evt_name);
+	       add_tracepoint_multi_event(list, idx, sys_name, evt_name, error) :
+	       add_tracepoint(list, idx, sys_name, evt_name, error);
 }
 
 static int add_tracepoint_multi_sys(struct list_head *list, int *idx,
-				    char *sys_name, char *evt_name)
+				    char *sys_name, char *evt_name,
+				    struct parse_events_error *error)
 {
 	struct dirent *events_ent;
 	DIR *events_dir;
@@ -465,7 +469,7 @@ static int add_tracepoint_multi_sys(struct list_head *list, int *idx,
 			continue;
 
 		ret = add_tracepoint_event(list, idx, events_ent->d_name,
-					   evt_name);
+					   evt_name, error);
 	}
 
 	closedir(events_dir);
@@ -473,12 +477,13 @@ static int add_tracepoint_multi_sys(struct list_head *list, int *idx,
 }
 
 int parse_events_add_tracepoint(struct list_head *list, int *idx,
-				char *sys, char *event)
+				char *sys, char *event,
+				struct parse_events_error *error)
 {
 	if (strpbrk(sys, "*?"))
-		return add_tracepoint_multi_sys(list, idx, sys, event);
+		return add_tracepoint_multi_sys(list, idx, sys, event, error);
 	else
-		return add_tracepoint_event(list, idx, sys, event);
+		return add_tracepoint_event(list, idx, sys, event, error);
 }
 
 static int
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index a09b0e210997..ffee7ece75a6 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -118,7 +118,8 @@ int parse_events__modifier_event(struct list_head *list, char *str, bool add);
 int parse_events__modifier_group(struct list_head *list, char *event_mod);
 int parse_events_name(struct list_head *list, char *name);
 int parse_events_add_tracepoint(struct list_head *list, int *idx,
-				char *sys, char *event);
+				char *sys, char *event,
+				struct parse_events_error *error);
 int parse_events_add_numeric(struct parse_events_evlist *data,
 			     struct list_head *list,
 			     u32 type, u64 config,
diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index 9cd70819c795..54a3004a8192 100644
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -376,7 +376,7 @@ PE_NAME '-' PE_NAME ':' PE_NAME
 	snprintf(&sys_name, 128, "%s-%s", $1, $3);
 
 	ALLOC_LIST(list);
-	ABORT_ON(parse_events_add_tracepoint(list, &data->idx, &sys_name, $5));
+	ABORT_ON(parse_events_add_tracepoint(list, &data->idx, &sys_name, $5, data->error));
 	$$ = list;
 }
 |
@@ -386,7 +386,7 @@ PE_NAME ':' PE_NAME
 	struct list_head *list;
 
 	ALLOC_LIST(list);
-	if (parse_events_add_tracepoint(list, &data->idx, $1, $3)) {
+	if (parse_events_add_tracepoint(list, &data->idx, $1, $3, data->error)) {
 		struct parse_events_error *error = data->error;
 
 		if (error) {
-- 
2.1.0

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#1225324 — [PATCH 3/8] tools: Add err.h with ERR_PTR PTR_ERR interface

FromArnaldo Carvalho de Melo <acme@kernel.org>
Date2015-09-15 17:40 +0200
Subject[PATCH 3/8] tools: Add err.h with ERR_PTR PTR_ERR interface
Message-ID<q90uS-xv-23@gated-at.bofh.it>
In reply to#1225314
From: Jiri Olsa <jolsa@kernel.org>

Adding part of the kernel's <linux/err.h> interface:

  inline void * __must_check ERR_PTR(long error);
  inline long   __must_check PTR_ERR(__force const void *ptr);
  inline bool   __must_check IS_ERR(__force const void *ptr);

It will be used to propagate error through pointers in following
patches.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Reviewed-by: Raphael Beamonte <raphael.beamonte@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1441615087-13886-2-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/include/linux/err.h | 49 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 tools/include/linux/err.h

diff --git a/tools/include/linux/err.h b/tools/include/linux/err.h
new file mode 100644
index 000000000000..c9ada48f5156
--- /dev/null
+++ b/tools/include/linux/err.h
@@ -0,0 +1,49 @@
+#ifndef __TOOLS_LINUX_ERR_H
+#define __TOOLS_LINUX_ERR_H
+
+#include <linux/compiler.h>
+#include <linux/types.h>
+
+#include <asm/errno.h>
+
+/*
+ * Original kernel header comment:
+ *
+ * Kernel pointers have redundant information, so we can use a
+ * scheme where we can return either an error code or a normal
+ * pointer with the same return value.
+ *
+ * This should be a per-architecture thing, to allow different
+ * error and pointer decisions.
+ *
+ * Userspace note:
+ * The same principle works for userspace, because 'error' pointers
+ * fall down to the unused hole far from user space, as described
+ * in Documentation/x86/x86_64/mm.txt for x86_64 arch:
+ *
+ * 0000000000000000 - 00007fffffffffff (=47 bits) user space, different per mm hole caused by [48:63] sign extension
+ * ffffffffffe00000 - ffffffffffffffff (=2 MB) unused hole
+ *
+ * It should be the same case for other architectures, because
+ * this code is used in generic kernel code.
+ */
+#define MAX_ERRNO	4095
+
+#define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
+
+static inline void * __must_check ERR_PTR(long error)
+{
+	return (void *) error;
+}
+
+static inline long __must_check PTR_ERR(__force const void *ptr)
+{
+	return (long) ptr;
+}
+
+static inline bool __must_check IS_ERR(__force const void *ptr)
+{
+	return IS_ERR_VALUE((unsigned long)ptr);
+}
+
+#endif /* _LINUX_ERR_H */
-- 
2.1.0

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#1225327 — [PATCH 2/8] perf probe: Export init/exit_probe_symbol_maps()

FromArnaldo Carvalho de Melo <acme@kernel.org>
Date2015-09-15 17:40 +0200
Subject[PATCH 2/8] perf probe: Export init/exit_probe_symbol_maps()
Message-ID<q90uS-xv-27@gated-at.bofh.it>
In reply to#1225314
From: Namhyung Kim <namhyung@kernel.org>

The init/exit_symbols_maps() functions are to setup and cleanup
necessary info for probe events.  But they need to be called from out of
the probe code now, so this patch exports them.

However the names are too generic, so change them to have 'probe'. :)

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1441852026-28974-2-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/builtin-probe.c    |  5 +++++
 tools/perf/util/probe-event.c | 31 +++++++++++++++----------------
 tools/perf/util/probe-event.h |  2 ++
 3 files changed, 22 insertions(+), 16 deletions(-)

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 2bec9c1ef2a3..94385ee89dc8 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -317,6 +317,10 @@ static int perf_add_probe_events(struct perf_probe_event *pevs, int npevs)
 	int i, k;
 	const char *event = NULL, *group = NULL;
 
+	ret = init_probe_symbol_maps(pevs->uprobes);
+	if (ret < 0)
+		return ret;
+
 	ret = convert_perf_probe_events(pevs, npevs);
 	if (ret < 0)
 		goto out_cleanup;
@@ -354,6 +358,7 @@ static int perf_add_probe_events(struct perf_probe_event *pevs, int npevs)
 
 out_cleanup:
 	cleanup_perf_probe_events(pevs, npevs);
+	exit_probe_symbol_maps();
 	return ret;
 }
 
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 3d7d60cc6f16..2b78e8f19b45 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -71,7 +71,7 @@ static char *synthesize_perf_probe_point(struct perf_probe_point *pp);
 static struct machine *host_machine;
 
 /* Initialize symbol maps and path of vmlinux/modules */
-static int init_symbol_maps(bool user_only)
+int init_probe_symbol_maps(bool user_only)
 {
 	int ret;
 
@@ -101,7 +101,7 @@ out:
 	return ret;
 }
 
-static void exit_symbol_maps(void)
+void exit_probe_symbol_maps(void)
 {
 	if (host_machine) {
 		machine__delete(host_machine);
@@ -859,11 +859,11 @@ int show_line_range(struct line_range *lr, const char *module, bool user)
 {
 	int ret;
 
-	ret = init_symbol_maps(user);
+	ret = init_probe_symbol_maps(user);
 	if (ret < 0)
 		return ret;
 	ret = __show_line_range(lr, module, user);
-	exit_symbol_maps();
+	exit_probe_symbol_maps();
 
 	return ret;
 }
@@ -941,7 +941,7 @@ int show_available_vars(struct perf_probe_event *pevs, int npevs,
 	int i, ret = 0;
 	struct debuginfo *dinfo;
 
-	ret = init_symbol_maps(pevs->uprobes);
+	ret = init_probe_symbol_maps(pevs->uprobes);
 	if (ret < 0)
 		return ret;
 
@@ -958,7 +958,7 @@ int show_available_vars(struct perf_probe_event *pevs, int npevs,
 
 	debuginfo__delete(dinfo);
 out:
-	exit_symbol_maps();
+	exit_probe_symbol_maps();
 	return ret;
 }
 
@@ -2262,7 +2262,7 @@ int show_perf_probe_events(struct strfilter *filter)
 
 	setup_pager();
 
-	ret = init_symbol_maps(false);
+	ret = init_probe_symbol_maps(false);
 	if (ret < 0)
 		return ret;
 
@@ -2278,7 +2278,7 @@ int show_perf_probe_events(struct strfilter *filter)
 		close(kp_fd);
 	if (up_fd > 0)
 		close(up_fd);
-	exit_symbol_maps();
+	exit_probe_symbol_maps();
 
 	return ret;
 }
@@ -2746,10 +2746,6 @@ int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs)
 {
 	int i, ret;
 
-	ret = init_symbol_maps(pevs->uprobes);
-	if (ret < 0)
-		return ret;
-
 	/* Loop 1: convert all events */
 	for (i = 0; i < npevs; i++) {
 		/* Init kprobe blacklist if needed */
@@ -2794,20 +2790,23 @@ void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs)
 		pevs[i].ntevs = 0;
 		clear_perf_probe_event(&pevs[i]);
 	}
-
-	exit_symbol_maps();
 }
 
 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs)
 {
 	int ret;
 
+	ret = init_probe_symbol_maps(pevs->uprobes);
+	if (ret < 0)
+		return ret;
+
 	ret = convert_perf_probe_events(pevs, npevs);
 	if (ret == 0)
 		ret = apply_perf_probe_events(pevs, npevs);
 
 	cleanup_perf_probe_events(pevs, npevs);
 
+	exit_probe_symbol_maps();
 	return ret;
 }
 
@@ -2867,7 +2866,7 @@ int show_available_funcs(const char *target, struct strfilter *_filter,
 	struct map *map;
 	int ret;
 
-	ret = init_symbol_maps(user);
+	ret = init_probe_symbol_maps(user);
 	if (ret < 0)
 		return ret;
 
@@ -2897,7 +2896,7 @@ end:
 	if (user) {
 		map__put(map);
 	}
-	exit_symbol_maps();
+	exit_probe_symbol_maps();
 
 	return ret;
 }
diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
index 9bcea36359f2..ba926c30f8cd 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -110,6 +110,8 @@ struct variable_list {
 };
 
 struct map;
+int init_probe_symbol_maps(bool user_only);
+void exit_probe_symbol_maps(void);
 
 /* Command string to events */
 extern int parse_perf_probe_command(const char *cmd,
-- 
2.1.0

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#1225771

FromIngo Molnar <mingo@kernel.org>
Date2015-09-16 09:30 +0200
Message-ID<q9fkd-63y-5@gated-at.bofh.it>
In reply to#1225314
* Arnaldo Carvalho de Melo <acme@kernel.org> wrote:

> Hi Ingo,
> 
> 	Please consider pulling,
> 
> - Arnaldo
> 
> The following changes since commit 9059b284caecb628fac826c2c5cc8ee85708eec1:
> 
>   Merge tag 'perf-core-for-mingo-2' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core (2015-09-15 08:50:59 +0200)
> 
> are available in the git repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git tags/perf-core-for-mingo

So your perf/urgent bits now conflict with the latest perf/core, in 
tools/perf/ui/browsers/hists.c. I have merged perf/urgent into perf/core - please 
double check my resolution (d71b0ad8d309).

> 
> for you to fetch changes up to bbbe6bf6037d77816c4a19aaf35f4cecf662b49a:
> 
>   perf tools: Introduce regs_query_register_offset() for x86 (2015-09-15 09:48:33 -0300)
> 
> ----------------------------------------------------------------
> perf/core improvements and fixes:
> 
> User visible:
> 
> - Enhance the error reporting of tracepoint event parsing, e.g.:
> 
>     $ oldperf record -e sched:sched_switc usleep 1
>     event syntax error: 'sched:sched_switc'
>                         \___ unknown tracepoint
>     Run 'perf list' for a list of valid events
> 
>   Now we get the much nicer:
> 
>     $ perf record -e sched:sched_switc ls
>     event syntax error: 'sched:sched_switc'
>                          \___ can't access trace events
> 
>     Error: No permissions to read /sys/kernel/debug/tracing/events/sched/sched_switc
>     Hint:  Try 'sudo mount -o remount,mode=755 /sys/kernel/debug'
> 
>   And after we have those mount point permissions fixed:
> 
>     $ perf record -e sched:sched_switc ls
>     event syntax error: 'sched:sched_switc'
>                          \___ unknown tracepoint
> 
>     Error: File /sys/kernel/debug/tracing/events/sched/sched_switc not found.
>     Hint:  Perhaps this kernel misses some CONFIG_ setting to enable this feature?.
> 
>   Now its just a matter of using what git uses to suggest alternatives when we
>   make a typo, i.e. that it is just an 'h' missing :-)

Nice changes!

Btw., wouldn't it be even better to allow partial matches? Not allowing 
'sched:sched_switc' is unnecessarily pedantic IMHO.

For example 'perf list' allows partial matches as well. As long as the resulting 
event is unique, we should allow partial matches. If it's not unique, we should 
print the first 3 matching entries or so.

There's a real UI advantage as well: I could abbreviate the command line with:

  -e sched_sw

instead of always being forced to type out the full tracepoint name.

(Programmatic tracepoint usage and portable scripts should naturally always spell 
out the full event, to make sure new tracepoints don't cause overlaps - but ad-hoc 
usage can do abbreviations just fine.)


>   I.e. basically now the event parsing routing uses the strerror_open()
>   routines introduced by and used in 'perf trace' work. (Jiri Olsa)
> 
> Infrastructure:
> 
> - Export init/exit_probe_symbol_maps() from 'perf probe' for use in eBPF
>   (Namhyung Kim)
> 
> - Free perf_probe_event in cleanup_perf_probe_events() (Namhyung Kim)
> 
> - regs_query_register_offset() infrastructure + implementation for x86.
>   First user will be the perf/eBPF code (Wang Nan)
> 
> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
> 
> ----------------------------------------------------------------
> Jiri Olsa (4):
>       tools: Add err.h with ERR_PTR PTR_ERR interface
>       perf tools: Propagate error info for the tracepoint parsing
>       perf evsel: Propagate error info from tp_format
>       perf tools: Enhance parsing events tracepoint error output
> 
> Namhyung Kim (2):
>       perf probe: Free perf_probe_event in cleanup_perf_probe_events()
>       perf probe: Export init/exit_probe_symbol_maps()
> 
> Wang Nan (2):
>       perf tools: regs_query_register_offset() infrastructure
>       perf tools: Introduce regs_query_register_offset() for x86
> 
>  tools/include/linux/err.h                   |  49 +++++++++++
>  tools/perf/arch/x86/Makefile                |   1 +
>  tools/perf/arch/x86/util/dwarf-regs.c       | 122 ++++++++++++++++++++--------
>  tools/perf/builtin-probe.c                  |   5 ++
>  tools/perf/builtin-trace.c                  |  19 +++--
>  tools/perf/config/Makefile                  |   4 +
>  tools/perf/tests/evsel-tp-sched.c           |  10 ++-
>  tools/perf/tests/mmap-basic.c               |   3 +-
>  tools/perf/tests/openat-syscall-all-cpus.c  |   3 +-
>  tools/perf/tests/openat-syscall-tp-fields.c |   3 +-
>  tools/perf/tests/openat-syscall.c           |   3 +-
>  tools/perf/util/evlist.c                    |   3 +-
>  tools/perf/util/evsel.c                     |  16 +++-
>  tools/perf/util/evsel.h                     |   3 +
>  tools/perf/util/include/dwarf-regs.h        |   8 ++
>  tools/perf/util/parse-events.c              |  66 +++++++++++----
>  tools/perf/util/parse-events.h              |   3 +-
>  tools/perf/util/parse-events.y              |  16 ++--
>  tools/perf/util/probe-event.c               |  32 ++++----
>  tools/perf/util/probe-event.h               |   2 +
>  tools/perf/util/trace-event.c               |  15 +++-
>  21 files changed, 291 insertions(+), 95 deletions(-)
>  create mode 100644 tools/include/linux/err.h

Pulled, thanks a lot Arnaldo!

	Ingo
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#1226101

FromArnaldo Carvalho de Melo <acme@kernel.org>
Date2015-09-16 16:00 +0200
Message-ID<q9lpE-6fG-15@gated-at.bofh.it>
In reply to#1225771
Em Wed, Sep 16, 2015 at 09:25:44AM +0200, Ingo Molnar escreveu:
> 
> * Arnaldo Carvalho de Melo <acme@kernel.org> wrote:
> 
> > Hi Ingo,
> > 
> > 	Please consider pulling,
> > 
> > - Arnaldo
> > 
> > The following changes since commit 9059b284caecb628fac826c2c5cc8ee85708eec1:
> > 
> >   Merge tag 'perf-core-for-mingo-2' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core (2015-09-15 08:50:59 +0200)
> > 
> > are available in the git repository at:
> > 
> >   git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git tags/perf-core-for-mingo
> 
> So your perf/urgent bits now conflict with the latest perf/core, in 
> tools/perf/ui/browsers/hists.c. I have merged perf/urgent into perf/core - please 
> double check my resolution (d71b0ad8d309).

Looks fine, tested it even, thanks!

- Arnaldo
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