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| author | Namhyung Kim <namhyung@kernel.org> | 2014-10-06 09:46:01 +0900 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2014-10-29 10:25:22 -0200 |
| commit | 380b5143ab76de71572c7a30e68c8e22b94bee52 (patch) | |
| tree | 52f0dc23a6586d4545c5f92464320adbc8b14ae6 /tools/perf/util/thread.c | |
| parent | 1776b10627e486dd431fe72d8d47e5a865cf65d1 (diff) | |
| download | talos-obmc-linux-380b5143ab76de71572c7a30e68c8e22b94bee52.tar.gz talos-obmc-linux-380b5143ab76de71572c7a30e68c8e22b94bee52.zip | |
perf callchain: Use global caching provided by libunwind
The libunwind provides two caching policy which are global and
per-thread. As perf unwinds callchains in a single thread, it'd
sufficient to use global caching.
This speeds up my perf report from 14s to 7s on a ~260MB data file.
Although the output sometimes contains a slight difference (~0.01% in
terms of number of lines printed) on callchains which were not resolved.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jean Pihet <jean.pihet@linaro.org>
Cc: Arun Sharma <asharma@fb.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jean Pihet <jean.pihet@linaro.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1412556363-26229-4-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/thread.c')
| -rw-r--r-- | tools/perf/util/thread.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c index 2b7b2d91c016..c41411726c7a 100644 --- a/tools/perf/util/thread.c +++ b/tools/perf/util/thread.c @@ -117,6 +117,9 @@ int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp, if (!new) return -ENOMEM; list_add(&new->list, &thread->comm_list); + + if (exec) + unwind__flush_access(thread); } thread->comm_set = true; |
