linux-kernel - [PATCH 3/5] perf timechart: get number of CPUs from perf header

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Date:	Mon,  2 Dec 2013 18:37:35 +0400
From:	Stanislav Fomichev <stfomichev@...dex-team.ru>
To:	linux-kernel@...r.kernel.org
Cc:	a.p.zijlstra@...llo.nl, paulus@...ba.org, mingo@...hat.com,
	acme@...stprotocols.net, stfomichev@...dex-team.ru,
	namhyung@...nel.org, artagnon@...il.com, jolsa@...hat.com
Subject: [PATCH 3/5] perf timechart: get number of CPUs from perf header

Print all CPUs, even if there were no events (use perf header to get number
of CPUs).
This is required to support topology in the next patch.

Signed-off-by: Stanislav Fomichev <stfomichev@...dex-team.ru>
---
 tools/perf/builtin-timechart.c | 32 ++++++++++++++++++++++++++------
 1 file changed, 26 insertions(+), 6 deletions(-)

diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
index 99fe363f1de8..db9c4c172587 100644
--- a/tools/perf/builtin-timechart.c
+++ b/tools/perf/builtin-timechart.c
@@ -531,12 +531,10 @@ static int process_sample_event(struct perf_tool *tool,
 			tchart->last_time = sample->time;
 	}
 
-	if (sample->cpu > tchart->numcpus)
-		tchart->numcpus = sample->cpu;
-
 	if (evsel->handler != NULL) {
 		tracepoint_handler f = evsel->handler;
-		return f(tchart, evsel, sample, cat_backtrace(event, sample, machine));
+		return f(tchart, evsel, sample,
+			 cat_backtrace(event, sample, machine));
 	}
 
 	return 0;
@@ -1038,8 +1036,6 @@ static void write_svg_file(struct timechart *tchart, const char *filename)
 	int count;
 	int thresh = TIME_THRESH;
 
-	tchart->numcpus++;
-
 	if (tchart->power_only)
 		tchart->proc_num = 0;
 
@@ -1069,6 +1065,25 @@ static void write_svg_file(struct timechart *tchart, const char *filename)
 	svg_close();
 }
 
+static int process_header(struct perf_file_section *section __maybe_unused,
+			  struct perf_header *ph,
+			  int feat,
+			  int fd __maybe_unused,
+			  void *data)
+{
+	struct timechart *tchart = data;
+
+	switch (feat) {
+	case HEADER_NRCPUS:
+		tchart->numcpus = ph->env.nr_cpus_avail;
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
 static int __cmd_timechart(struct timechart *tchart, const char *output_name)
 {
 	const struct perf_evsel_str_handler power_tracepoints[] = {
@@ -1094,6 +1109,11 @@ static int __cmd_timechart(struct timechart *tchart, const char *output_name)
 	if (session == NULL)
 		return -ENOMEM;
 
+	(void)perf_header__process_sections(&session->header,
+					    perf_data_file__fd(session->file),
+					    tchart,
+					    process_header);
+
 	if (!perf_session__has_traces(session, "timechart record"))
 		goto out_delete;
 
-- 
1.8.3.2

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