Messages in this thread Patch in this message | | | Date | Thu, 16 Jul 2020 12:36:30 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH v5 03/17] perf ftrace: add option -t/--tid to filter by thread id |
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Em Sat, Jul 11, 2020 at 08:40:21PM +0800, Changbin Du escreveu: > This allows us to trace single thread instead of the whole process. > > Signed-off-by: Changbin Du <changbin.du@gmail.com> > --- > tools/perf/Documentation/perf-ftrace.txt | 4 ++++ > tools/perf/builtin-ftrace.c | 2 ++ > 2 files changed, 6 insertions(+) > > diff --git a/tools/perf/Documentation/perf-ftrace.txt b/tools/perf/Documentation/perf-ftrace.txt > index d79560dea19f..e204bf6d50d8 100644 > --- a/tools/perf/Documentation/perf-ftrace.txt > +++ b/tools/perf/Documentation/perf-ftrace.txt > @@ -38,6 +38,10 @@ OPTIONS > --pid=:: > Trace on existing process id (comma separated list). > > +-t:: > +--tid=:: > + Trace on existing thread id (comma separated list). > +
Humm, I just tried:
[root@five ~]# yes > /dev/null & [1] 18265 [root@five ~]# perf ftrace --tid 18265 ^C[root@five ~]#
After waiting for a while, nothing, what am I doing wrong?
- Arnaldo
> -a:: > --all-cpus:: > Force system-wide collection. Scripts run without a <command> > diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c > index 244cc8e6bd60..1188b82c6541 100644 > --- a/tools/perf/builtin-ftrace.c > +++ b/tools/perf/builtin-ftrace.c > @@ -515,6 +515,8 @@ int cmd_ftrace(int argc, const char **argv) > "Show available functions to filter"), > OPT_STRING('p', "pid", &ftrace.target.pid, "pid", > "trace on existing process id"), > + OPT_STRING('t', "tid", &ftrace.target.tid, "tid", > + "trace on existing thread id (exclusive to --pid)"), > OPT_INCR('v', "verbose", &verbose, > "be more verbose"), > OPT_BOOLEAN('a', "all-cpus", &ftrace.target.system_wide, > -- > 2.25.1 >
--
- Arnaldo
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