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author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2017-07-20 11:17:51 -0300 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2017-07-20 11:17:51 -0300 |
commit | dd1a50377c92321f78fa4d0601bb4d88d88670ab (patch) | |
tree | e72472617baf72d5f6d9dd147e51a104247737f7 /tools/perf/builtin-trace.c | |
parent | 15bed2742a8d60210b958963ca1091d3cfc4f332 (diff) | |
download | op-kernel-dev-dd1a50377c92321f78fa4d0601bb4d88d88670ab.zip op-kernel-dev-dd1a50377c92321f78fa4d0601bb4d88d88670ab.tar.gz |
perf trace: Introduce filter_loop_pids()
No change in functionality, just to make clearer that what we want when
filtering the tracer pid in a system wide tracing session is to avoid a
feedback loop.
This also paves the way for a more interesting loop avoidance algorithm,
one that tries to figure out if we are in a ssh session, xterm, etc.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-5fcttc5kdjkcyp9404ezkuy9@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-trace.c')
-rw-r--r-- | tools/perf/builtin-trace.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index 9e74e67..0ba36f0 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -2239,6 +2239,16 @@ out_enomem: goto out; } +static int trace__set_filter_loop_pids(struct trace *trace) +{ + int nr = 1; + pid_t pids[32] = { + getpid(), + }; + + return perf_evlist__set_filter_pids(trace->evlist, nr, pids); +} + static int trace__run(struct trace *trace, int argc, const char **argv) { struct perf_evlist *evlist = trace->evlist; @@ -2362,7 +2372,7 @@ static int trace__run(struct trace *trace, int argc, const char **argv) if (trace->filter_pids.nr > 0) err = perf_evlist__set_filter_pids(evlist, trace->filter_pids.nr, trace->filter_pids.entries); else if (thread_map__pid(evlist->threads, 0) == -1) - err = perf_evlist__set_filter_pid(evlist, getpid()); + err = trace__set_filter_loop_pids(trace); if (err < 0) goto out_error_mem; |