linux-kernel - [PATCH 11/11] perf intel-pt: Add callchain to synthesized PEBS sample

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Date:   Mon, 10 Jun 2019 10:28:03 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 11/11] perf intel-pt: Add callchain to synthesized PEBS sample

Like other synthesized events, if there is also an Intel PT branch trace,
then a call stack can also be synthesized.  Add that.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/util/intel-pt.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index 0b7beb98a028..ea03bdaf8009 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -1626,6 +1626,14 @@ static int intel_pt_synth_pebs_sample(struct intel_pt_queue *ptq)
 			sample.time = tsc_to_perf_time(timestamp, &pt->tc);
 	}
 
+	if (sample_type & PERF_SAMPLE_CALLCHAIN &&
+	    pt->synth_opts.callchain) {
+		thread_stack__sample(ptq->thread, ptq->cpu, ptq->chain,
+				     pt->synth_opts.callchain_sz, sample.ip,
+				     pt->kernel_start);
+		sample.callchain = ptq->chain;
+	}
+
 	if (sample_type & PERF_SAMPLE_REGS_INTR &&
 	    items->mask[INTEL_PT_GP_REGS_POS]) {
 		u64 regs[sizeof(sample.intr_regs.mask)];
-- 
2.17.1