From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Masami Hiramatsu <mhiramat@kernel.org>
Cc: linux-kernel@vger.kernel.org, Namhyung Kim <namhyung@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Hemant Kumar <hemant@linux.vnet.ibm.com>,
Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>,
Brendan Gregg <brendan.d.gregg@gmail.com>
Subject: Re: [PATCH perf/core 07/10] perf probe: Support @BUILDID or @FILE suffix for SDT events
Date: Wed, 13 Jul 2016 16:50:19 -0300 [thread overview]
Message-ID: <20160713195019.GA2927@kernel.org> (raw)
In-Reply-To: <146831793746.17065.13065062753978236612.stgit@devbox>
Em Tue, Jul 12, 2016 at 07:05:37PM +0900, Masami Hiramatsu escreveu:
> 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.
Ok, how to add those entries?
[root@jouet hello_world]# perf probe -x /usr/bin/gcc -a %sdt_gcc:\*
Error: Failed to add events.
[root@jouet hello_world]# perf probe --verbose -x /usr/bin/gcc -a %sdt_gcc:\*
probe-definition(0): %sdt_gcc:*
0 arguments
symbol:throw file:(null) line:0 offset:0 return:0 lazy:(null)
symbol:rethrow file:(null) line:0 offset:0 return:0 lazy:(null)
symbol:catch file:(null) line:0 offset:0 return:0 lazy:(null)
symbol:unwind file:(null) line:0 offset:0 return:0 lazy:(null)
Error: Failed to add events. Reason: No such file or directory (Code: -2)
[root@jouet hello_world]#
Can those messages be improved? What am I missing?
> ----
> # 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>
> ---
> Changes in v12:
> - Rename strlist__for_each to strlist__for_each_entry.
> ---
> tools/perf/util/build-id.c | 43 +++++++++++++++++++++++++++++++++++++++++
> tools/perf/util/build-id.h | 1 +
> tools/perf/util/probe-event.c | 17 ++++++++++++++--
> 3 files changed, 59 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
> index 8e86a83..e59003e 100644
> --- a/tools/perf/util/build-id.c
> +++ b/tools/perf/util/build-id.c
> @@ -523,6 +523,49 @@ err_out:
> goto out_free;
> }
>
> +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 *bidlist;
> + 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))
> + return NULL;
> +
> + bidlist = build_id_cache__list_all(true);
> + if (!bidlist)
> + return NULL;
> +
> + strlist__for_each_entry(nd, bidlist) {
> + 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(bidlist);
> +
> + 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 64e740f..d279906 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);
> struct strlist *build_id_cache__list_all(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 679aa6b..0dadaa3 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -1251,8 +1251,21 @@ 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 be an SDT 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) {
next prev parent reply other threads:[~2016-07-13 19:50 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-12 10:04 [PATCH perf/core 00/10] perf-probe --cache and SDT support Masami Hiramatsu
2016-07-12 10:04 ` [PATCH perf/core 01/10] [BUGFIX] perf-probe: Fix to show correct error message for $vars and $params Masami Hiramatsu
2016-07-14 7:05 ` [tip:perf/core] perf probe: " tip-bot for Masami Hiramatsu
2016-07-12 10:04 ` [PATCH perf/core 02/10] perf probe: Accept %sdt and %cached event name Masami Hiramatsu
2016-07-14 7:05 ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2016-07-12 10:04 ` [PATCH perf/core 03/10] perf-probe: Make --list shows only available cached events Masami Hiramatsu
2016-07-13 19:28 ` Arnaldo Carvalho de Melo
2016-07-14 6:13 ` Masami Hiramatsu
2016-07-14 7:06 ` [tip:perf/core] perf probe: Make --list show " tip-bot for Masami Hiramatsu
2016-07-12 10:05 ` [PATCH perf/core 04/10] perf: probe-cache: Add for_each_probe_cache_entry() wrapper Masami Hiramatsu
2016-07-14 7:06 ` [tip:perf/core] perf " tip-bot for Masami Hiramatsu
2016-07-12 10:05 ` [PATCH perf/core 05/10] perf probe: Allow wildcard for cached events Masami Hiramatsu
2016-07-13 19:36 ` Arnaldo Carvalho de Melo
2016-07-14 7:07 ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2016-07-12 10:05 ` [PATCH perf/core 06/10] perf probe: Search SDT/cached event from all probe caches Masami Hiramatsu
2016-07-14 7:07 ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2016-07-12 10:05 ` [PATCH perf/core 07/10] perf probe: Support @BUILDID or @FILE suffix for SDT events Masami Hiramatsu
2016-07-13 19:50 ` Arnaldo Carvalho de Melo [this message]
2016-07-14 0:07 ` Arnaldo Carvalho de Melo
2016-07-14 0:16 ` Arnaldo Carvalho de Melo
2016-07-14 0:20 ` Arnaldo Carvalho de Melo
2016-07-14 15:32 ` Masami Hiramatsu
2016-07-14 7:08 ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2016-07-12 10:05 ` [PATCH perf/core 08/10] perf probe: Support a special SDT probe format Masami Hiramatsu
2016-07-14 7:08 ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2016-07-12 10:05 ` [PATCH perf/core 09/10] perf build: Add sdt feature detection Masami Hiramatsu
2016-07-14 7:09 ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2016-07-12 10:06 ` [PATCH perf/core 10/10] perf-test: Add a test case for SDT event Masami Hiramatsu
2016-07-14 7:10 ` [tip:perf/core] perf test: " tip-bot for Masami Hiramatsu
2016-07-14 1:35 ` [PATCH perf/core 00/10] perf-probe --cache and SDT support Arnaldo Carvalho de Melo
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