forked from luck/tmp_suning_uos_patched
perf tools: Add an option to multiplex counters in a single channel
Add an option to multiplex counters output in the channel of the group leader, ie: the first counter opened: -M --multiplex The effect is better serialized samples. This is especially useful for tracepoint samples that need to be well serialized for their post-processing. Also make use of this option in 'perf sched'. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -48,6 +48,7 @@ static int call_graph = 0;
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static int inherit_stat = 0;
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static int no_samples = 0;
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static int sample_address = 0;
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static int multiplex = 0;
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static long samples;
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static struct timeval last_read;
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@ -485,6 +486,9 @@ static void create_counter(int counter, int cpu, pid_t pid)
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exit(-1);
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}
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if (multiplex && fd[nr_cpu][counter] != group_fd)
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ioctl(fd[nr_cpu][counter], PERF_COUNTER_IOC_SET_OUTPUT, group_fd);
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ioctl(fd[nr_cpu][counter], PERF_COUNTER_IOC_ENABLE);
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}
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@ -681,6 +685,8 @@ static const struct option options[] = {
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"Sample addresses"),
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OPT_BOOLEAN('n', "no-samples", &no_samples,
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"don't sample"),
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OPT_BOOLEAN('M', "multiplex", &multiplex,
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"multiplex counter output in a single channel"),
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OPT_END()
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};
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@ -1660,6 +1660,8 @@ static const char *record_args[] = {
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"record",
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"-a",
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"-R",
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"-M",
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"-g",
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"-c", "1",
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"-e", "sched:sched_switch:r",
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"-e", "sched:sched_stat_wait:r",
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