linux-kernel - [PATCH 35/37] perf tools: Intel PT to always update thread stack trace number

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Date:	Tue, 26 May 2015 13:48:06 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 35/37] perf tools: Intel PT to always update thread stack trace number

From: Adrian Hunter <adrian.hunter@...el.com>

The enhanced thread stack is used by higher layers but still requires
the trace number.  The trace number is used to distinguish discontinuous
sections of trace (for example from Snapshot mode or Sample mode), which
cause the thread stack to be flushed.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Link: http://lkml.kernel.org/r/1432295653-13989-14-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/intel-pt.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index 9c25bfadb4f3..5a59fd8e79ae 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -265,7 +265,7 @@ static int intel_pt_get_trace(struct intel_pt_buffer *b, void *data)
 	if (!old_buffer || ptq->pt->sampling_mode || (ptq->pt->snapshot_mode &&
 						      !buffer->consecutive)) {
 		b->consecutive = false;
-		b->trace_nr = buffer->buffer_nr;
+		b->trace_nr = buffer->buffer_nr + 1;
 	} else {
 		b->consecutive = true;
 	}
@@ -1075,6 +1075,8 @@ static int intel_pt_sample(struct intel_pt_queue *ptq)
 		thread_stack__event(ptq->thread, ptq->flags, state->from_ip,
 				    state->to_ip, ptq->insn_len,
 				    state->trace_nr);
+	else
+		thread_stack__set_trace_nr(ptq->thread, state->trace_nr);
 
 	if (pt->sample_branches) {
 		err = intel_pt_synth_branch_sample(ptq);
-- 
2.1.0

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