linux-kernel - [tip:perf/core] perf tools: Fix Intel PT 'instructions' sample period

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Message-ID: <tip-2a21d03686881331b0af0471588674e7e896eeb2@git.kernel.org>
Date:	Thu, 27 Aug 2015 23:37:49 -0700
From:	tip-bot for Adrian Hunter <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, jolsa@...hat.com, mingo@...nel.org,
	tglx@...utronix.de, hpa@...or.com, adrian.hunter@...el.com,
	linux-kernel@...r.kernel.org
Subject: [tip:perf/core] perf tools: Fix Intel PT 'instructions'
  sample period

Commit-ID:  2a21d03686881331b0af0471588674e7e896eeb2
Gitweb:     http://git.kernel.org/tip/2a21d03686881331b0af0471588674e7e896eeb2
Author:     Adrian Hunter <adrian.hunter@...el.com>
AuthorDate: Fri, 17 Jul 2015 19:33:48 +0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 24 Aug 2015 17:42:26 -0300

perf tools: Fix Intel PT 'instructions' sample period

The period on synthesized 'instructions' samples was being set to a
fixed value, whereas the correct value is the number of instructions
since the last sample, which is a value that the decoder can provide.
So do it that way.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Link: http://lkml.kernel.org/r/1437150840-31811-14-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 3 +++
 tools/perf/util/intel-pt-decoder/intel-pt-decoder.h | 1 +
 tools/perf/util/intel-pt.c                          | 5 ++++-
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
index f8ac462..56790ea 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -108,6 +108,7 @@ struct intel_pt_decoder {
 	uint64_t sign_bits;
 	uint64_t period;
 	enum intel_pt_period_type period_type;
+	uint64_t tot_insn_cnt;
 	uint64_t period_insn_cnt;
 	uint64_t period_mask;
 	uint64_t period_ticks;
@@ -559,6 +560,7 @@ static int intel_pt_walk_insn(struct intel_pt_decoder *decoder,
 	err = decoder->walk_insn(intel_pt_insn, &insn_cnt, &decoder->ip, ip,
 				 max_insn_cnt, decoder->data);
 
+	decoder->tot_insn_cnt += insn_cnt;
 	decoder->timestamp_insn_cnt += insn_cnt;
 	decoder->period_insn_cnt += insn_cnt;
 
@@ -1529,6 +1531,7 @@ const struct intel_pt_state *intel_pt_decode(struct intel_pt_decoder *decoder)
 	decoder->state.timestamp = decoder->timestamp;
 	decoder->state.est_timestamp = intel_pt_est_timestamp(decoder);
 	decoder->state.cr3 = decoder->cr3;
+	decoder->state.tot_insn_cnt = decoder->tot_insn_cnt;
 
 	if (err)
 		decoder->state.from_ip = decoder->ip;
diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.h b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.h
index 4c48802..cbf5704 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.h
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.h
@@ -58,6 +58,7 @@ struct intel_pt_state {
 	uint64_t from_ip;
 	uint64_t to_ip;
 	uint64_t cr3;
+	uint64_t tot_insn_cnt;
 	uint64_t timestamp;
 	uint64_t est_timestamp;
 	uint64_t trace_nr;
diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index a5acd2f..3b34a64 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -126,6 +126,7 @@ struct intel_pt_queue {
 	u64 timestamp;
 	u32 flags;
 	u16 insn_len;
+	u64 last_insn_cnt;
 };
 
 static void intel_pt_dump(struct intel_pt *pt __maybe_unused,
@@ -920,11 +921,13 @@ static int intel_pt_synth_instruction_sample(struct intel_pt_queue *ptq)
 	sample.addr = ptq->state->to_ip;
 	sample.id = ptq->pt->instructions_id;
 	sample.stream_id = ptq->pt->instructions_id;
-	sample.period = ptq->pt->instructions_sample_period;
+	sample.period = ptq->state->tot_insn_cnt - ptq->last_insn_cnt;
 	sample.cpu = ptq->cpu;
 	sample.flags = ptq->flags;
 	sample.insn_len = ptq->insn_len;
 
+	ptq->last_insn_cnt = ptq->state->tot_insn_cnt;
+
 	if (pt->synth_opts.callchain) {
 		thread_stack__sample(ptq->thread, ptq->chain,
 				     pt->synth_opts.callchain_sz, sample.ip);
--
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