mirror of https://gitee.com/openkylin/linux.git
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>
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dd1a50377c
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@ -2239,6 +2239,16 @@ static int trace__set_ev_qualifier_filter(struct trace *trace)
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goto out;
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}
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static int trace__set_filter_loop_pids(struct trace *trace)
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{
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int nr = 1;
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pid_t pids[32] = {
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getpid(),
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};
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return perf_evlist__set_filter_pids(trace->evlist, nr, pids);
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}
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static int trace__run(struct trace *trace, int argc, const char **argv)
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{
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struct perf_evlist *evlist = trace->evlist;
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@ -2362,7 +2372,7 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
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if (trace->filter_pids.nr > 0)
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err = perf_evlist__set_filter_pids(evlist, trace->filter_pids.nr, trace->filter_pids.entries);
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else if (thread_map__pid(evlist->threads, 0) == -1)
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err = perf_evlist__set_filter_pid(evlist, getpid());
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err = trace__set_filter_loop_pids(trace);
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if (err < 0)
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goto out_error_mem;
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