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perf cs-etm: Generate branch sample for CS_ETM_TRACE_ON packet

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CS_ETM_TRACE_ON packet itself can give the info that there have a
discontinuity in the trace, this patch is to add branch sample for
CS_ETM_TRACE_ON packet if it is inserted in the middle of CS_ETM_RANGE
packets; as result we can have hint for the trace discontinuity.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kim Phillips <kim.phillips@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Robert Walker <robert.walker@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1531295145-596-7-git-send-email-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Leo Yan 2018-07-11 15:45:45 +08:00 committed by Arnaldo Carvalho de Melo
parent d603b4e9f9
commit 14a85b1eca
1 changed files with 17 additions and 7 deletions
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24
tools/perf/util/cs-etm.c
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@ -910,13 +910,23 @@ static int cs_etm__sample(struct cs_etm_queue *etmq)
etmq->period_instructions = instrs_over;
}
if (etm->sample_branches &&
etmq->prev_packet &&
etmq->prev_packet->sample_type == CS_ETM_RANGE &&
etmq->prev_packet->last_instr_taken_branch) {
ret = cs_etm__synth_branch_sample(etmq);
if (ret)
return ret;
if (etm->sample_branches && etmq->prev_packet) {
bool generate_sample = false;
/* Generate sample for tracing on packet */
if (etmq->prev_packet->sample_type == CS_ETM_TRACE_ON)
generate_sample = true;
/* Generate sample for branch taken packet */
if (etmq->prev_packet->sample_type == CS_ETM_RANGE &&
etmq->prev_packet->last_instr_taken_branch)
generate_sample = true;
if (generate_sample) {
ret = cs_etm__synth_branch_sample(etmq);
if (ret)
return ret;
}
}
if (etm->sample_branches || etm->synth_opts.last_branch) {