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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>
This commit is contained in:
Arnaldo Carvalho de Melo 2017-07-20 11:17:51 -03:00
parent 15bed2742a
commit dd1a50377c
1 changed files with 11 additions and 1 deletions
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12
tools/perf/builtin-trace.c
View File

@ -2239,6 +2239,16 @@ out_enomem:
goto out; 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) static int trace__run(struct trace *trace, int argc, const char **argv)
{ {
struct perf_evlist *evlist = trace->evlist; 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) if (trace->filter_pids.nr > 0)
err = perf_evlist__set_filter_pids(evlist, trace->filter_pids.nr, trace->filter_pids.entries); err = perf_evlist__set_filter_pids(evlist, trace->filter_pids.nr, trace->filter_pids.entries);
else if (thread_map__pid(evlist->threads, 0) == -1) 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) if (err < 0)
goto out_error_mem; goto out_error_mem;