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perf cs-etm: Generate branch sample for CS_ETM_TRACE_ON packet
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>
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1 changed files with 17 additions and 7 deletions
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@ -910,13 +910,23 @@ static int cs_etm__sample(struct cs_etm_queue *etmq)
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etmq->period_instructions = instrs_over;
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}
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if (etm->sample_branches &&
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etmq->prev_packet &&
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etmq->prev_packet->sample_type == CS_ETM_RANGE &&
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etmq->prev_packet->last_instr_taken_branch) {
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ret = cs_etm__synth_branch_sample(etmq);
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if (ret)
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return ret;
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if (etm->sample_branches && etmq->prev_packet) {
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bool generate_sample = false;
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/* Generate sample for tracing on packet */
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if (etmq->prev_packet->sample_type == CS_ETM_TRACE_ON)
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generate_sample = true;
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/* Generate sample for branch taken packet */
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if (etmq->prev_packet->sample_type == CS_ETM_RANGE &&
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etmq->prev_packet->last_instr_taken_branch)
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generate_sample = true;
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if (generate_sample) {
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ret = cs_etm__synth_branch_sample(etmq);
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if (ret)
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return ret;
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}
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}
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if (etm->sample_branches || etm->synth_opts.last_branch) {
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