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

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Message-ID: <tip-e01f0ef509ea7e76929f24a074d241de52c6f82a@git.kernel.org>
Date:   Fri, 21 Jun 2019 23:43:00 -0700
From:   tip-bot for Adrian Hunter <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, hpa@...or.com,
        adrian.hunter@...el.com, tglx@...utronix.de, acme@...hat.com,
        jolsa@...hat.com, mingo@...nel.org
Subject: [tip:perf/core] perf intel-pt: Add callchain to synthesized PEBS
 sample

Commit-ID:  e01f0ef509ea7e76929f24a074d241de52c6f82a
Gitweb:     https://git.kernel.org/tip/e01f0ef509ea7e76929f24a074d241de52c6f82a
Author:     Adrian Hunter <adrian.hunter@...el.com>
AuthorDate: Mon, 10 Jun 2019 10:28:03 +0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 17 Jun 2019 15:57:18 -0300

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>
Cc: Jiri Olsa <jolsa@...hat.com>
Link: http://lkml.kernel.org/r/20190610072803.10456-12-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.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 bf7647897e8a..550db6e77968 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -1730,6 +1730,14 @@ 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)];