linux-kernel - [tip:perf/stat] perf stat: Print stalled cycles percentage

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Message-ID: <tip-fd6x8r1cpyb6zhlrc4ix8m45@git.kernel.org>
Date:	Wed, 27 Apr 2011 15:59:25 GMT
From:	tip-bot for Ingo Molnar <mingo@...e.hu>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com, hpa@...or.com,
	mingo@...hat.com, a.p.zijlstra@...llo.nl, fweisbec@...il.com,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/stat] perf stat: Print stalled cycles percentage

Commit-ID:  11ba2b85f506306c8dfc9fe144aa4ddc43242855
Gitweb:     http://git.kernel.org/tip/11ba2b85f506306c8dfc9fe144aa4ddc43242855
Author:     Ingo Molnar <mingo@...e.hu>
AuthorDate: Sun, 24 Apr 2011 15:05:10 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Tue, 26 Apr 2011 20:04:54 +0200

perf stat: Print stalled cycles percentage

Print:

           611,527 cycles
           400,553 instructions             # (  0.71 instructions per cycle )
            77,809 stalled-cycles           # ( 12.71% of all cycles )

        0.000610987  seconds time elapsed

Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Acked-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
Link: http://lkml.kernel.org/n/tip-fd6x8r1cpyb6zhlrc4ix8m45@git.kernel.org
---
 tools/perf/builtin-stat.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 03f0e45..3a29041 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -442,7 +442,7 @@ static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
 		if (total)
 			ratio = avg / total;
 
-		fprintf(stderr, " # %10.3f IPC  ", ratio);
+		fprintf(stderr, " # ( %4.2f instructions per cycle )", ratio);
 	} else if (perf_evsel__match(evsel, HARDWARE, HW_BRANCH_MISSES) &&
 			runtime_branches_stats[cpu].n != 0) {
 		total = avg_stats(&runtime_branches_stats[cpu]);
@@ -450,7 +450,7 @@ static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
 		if (total)
 			ratio = avg * 100 / total;
 
-		fprintf(stderr, " # %10.3f %%    ", ratio);
+		fprintf(stderr, " # %10.3f %%", ratio);
 
 	} else if (runtime_nsecs_stats[cpu].n != 0) {
 		total = avg_stats(&runtime_nsecs_stats[cpu]);
@@ -459,6 +459,13 @@ static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
 			ratio = 1000.0 * avg / total;
 
 		fprintf(stderr, " # %10.3f M/sec", ratio);
+	} else if (perf_evsel__match(evsel, HARDWARE, HW_STALLED_CYCLES)) {
+		total = avg_stats(&runtime_cycles_stats[cpu]);
+
+		if (total)
+			ratio = avg / total * 100.0;
+
+		fprintf(stderr, " # (%5.2f%% of all cycles )", ratio);
 	}
 }
 
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