[tip:perfcounters/core] perf stat: Print out instructins/cycle metric

tip-bot for Ingo Molnar
2009-06-07T17:22:23Z

Commit-ID: e779898aa74cd2e97216368b3f3689ceffe8aeed
Gitweb: http://git.kernel.org/tip/e779898aa74cd2e97216368b3f3689ceffe8aeed
Author: Ingo Molnar <mingo@elte.hu>
AuthorDate: Sun, 7 Jun 2009 18:14:46 +0200
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Sun, 7 Jun 2009 18:14:46 +0200

perf stat: Print out instructins/cycle metric

Before:

7549326754 cycles # 3201.811 M/sec
10007594937 instructions # 4244.408 M/sec

After:

7542051194 cycles # 3201.996 M/sec
10007743852 instructions # 4248.811 M/sec # 1.327 per cycle

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

---
tools/perf/builtin-stat.c | 11 +++++++++++
1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 184ff95..8085509 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -83,6 +83,7 @@ static __u64 event_scaled[MAX_COUNTERS];

static __u64 runtime_nsecs;
static __u64 walltime_nsecs;
+static __u64 runtime_cycles;

static void create_perf_stat_counter(int counter)
{
@@ -177,6 +178,9 @@ static void read_counter(int counter)
if (attrs[counter].type == PERF_TYPE_SOFTWARE &&
attrs[counter].config == PERF_COUNT_TASK_CLOCK)
runtime_nsecs = count[0];
+ if (attrs[counter].type == PERF_TYPE_HARDWARE &&
+ attrs[counter].config == PERF_COUNT_CPU_CYCLES)
+ runtime_cycles = count[0];
}

/*
@@ -214,6 +218,13 @@ static void print_counter(int counter)
if (runtime_nsecs)
fprintf(stderr, " # %11.3f M/sec",
(double)count[0]/runtime_nsecs*1000.0);
+ if (runtime_cycles &&
+ attrs[counter].type == PERF_TYPE_HARDWARE &&
+ attrs[counter].config == PERF_COUNT_INSTRUCTIONS) {
+
+ fprintf(stderr, " # %1.3f per cycle",
+ (double)count[0] / (double)runtime_cycles);
+ }
}
if (scaled)
fprintf(stderr, " (scaled from %.2f%%)",