Commit 14a85b1e authored Jul 11, 2018 by Leo Yan Committed by Arnaldo Carvalho de Melo Jul 31, 2018

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>

parent d603b4e9

tools/perf/util/cs-etm.c

+17 −7

Original line number	Diff line number	Diff line
		@@ -910,14 +910,24 @@ 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) {
		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) {
		/*