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perf cs-etm: Add handling of switch-CPU-wide events 

Add handling of SWITCH-CPU-WIDE events in order to add the tid/pid of
the incoming process to the perf tools machine infrastructure.  This
information is later retrieved when a contextID packet is found in the
trace stream.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Tested-by: Leo Yan <leo.yan@linaro.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: coresight@lists.linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/20190524173508.29044-6-mathieu.poirier@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Mathieu Poirier 2019-05-24 11:34:56 -06:00 committed by Arnaldo Carvalho de Melo
parent a465f3c3e3
commit e0d170fa9a
1 changed files with 38 additions and 0 deletions
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38
tools/perf/util/cs-etm.c
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@ -1680,6 +1680,42 @@ static int cs_etm__process_itrace_start(struct cs_etm_auxtrace *etm,
return 0;
}
static int cs_etm__process_switch_cpu_wide(struct cs_etm_auxtrace *etm,
union perf_event *event)
{
struct thread *th;
bool out = event->header.misc & PERF_RECORD_MISC_SWITCH_OUT;
/*
* Context switch in per-thread mode are irrelevant since perf
* will start/stop tracing as the process is scheduled.
*/
if (etm->timeless_decoding)
return 0;
/*
* SWITCH_IN events carry the next process to be switched out while
* SWITCH_OUT events carry the process to be switched in. As such
* we don't care about IN events.
*/
if (!out)
return 0;
/*
* Add the tid/pid to the log so that we can get a match when
* we get a contextID from the decoder.
*/
th = machine__findnew_thread(etm->machine,
event->context_switch.next_prev_pid,
event->context_switch.next_prev_tid);
if (!th)
return -ENOMEM;
thread__put(th);
return 0;
}
static int cs_etm__process_event(struct perf_session *session,
union perf_event *event,
struct perf_sample *sample,
@ -1719,6 +1755,8 @@ static int cs_etm__process_event(struct perf_session *session,
if (event->header.type == PERF_RECORD_ITRACE_START)
return cs_etm__process_itrace_start(etm, event);
else if (event->header.type == PERF_RECORD_SWITCH_CPU_WIDE)
return cs_etm__process_switch_cpu_wide(etm, event);
return 0;
}