From: Ingo Molnar Date: Fri, 29 May 2009 07:10:54 +0000 (+0200) Subject: perf_counter tools: Also display time-normalized stat results X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=be1ac0d81d0e3ab655f8c8ade31fb860ef6aa186;p=mv-sheeva.git perf_counter tools: Also display time-normalized stat results Add new column that normalizes counter results by 'nanoseconds spent running' unit. Before: Performance counter stats for '/home/mingo/hackbench': 10469.403605 task clock ticks (msecs) 75502 context switches (events) 9501 CPU migrations (events) 36158 pagefaults (events) 31975676185 CPU cycles (events) 26257738659 instructions (events) 108740581 cache references (events) 54606088 cache misses (events) Wall-clock time elapsed: 810.514504 msecs After: Performance counter stats for '/home/mingo/hackbench': 10469.403605 task clock ticks (msecs) 75502 context switches # 0.007 M/sec 9501 CPU migrations # 0.001 M/sec 36158 pagefaults # 0.003 M/sec 31975676185 CPU cycles # 3054.202 M/sec 26257738659 instructions # 2508.045 M/sec 108740581 cache references # 10.387 M/sec 54606088 cache misses # 5.216 M/sec Wall-clock time elapsed: 810.514504 msecs The advantage of that column is that it is characteristic of the execution workflow, regardless of runtime. Hence 'hackbench 10' will look similar to 'hackbench 15' - while the absolute counter values are very different. Cc: Peter Zijlstra Cc: Mike Galbraith Cc: Paul Mackerras Cc: Corey Ashford Cc: Marcelo Tosatti Cc: Arnaldo Carvalho de Melo Cc: Thomas Gleixner Cc: John Kacur LKML-Reference: Signed-off-by: Ingo Molnar --- diff --git a/Documentation/perf_counter/builtin-stat.c b/Documentation/perf_counter/builtin-stat.c index 0c92eb72552..ef7e0e1192c 100644 --- a/Documentation/perf_counter/builtin-stat.c +++ b/Documentation/perf_counter/builtin-stat.c @@ -74,6 +74,8 @@ static const unsigned int default_count[] = { static __u64 event_res[MAX_COUNTERS][3]; static __u64 event_scaled[MAX_COUNTERS]; +static __u64 runtime_nsecs; + static void create_perfstat_counter(int counter) { struct perf_counter_hw_event hw_event; @@ -165,6 +167,11 @@ static void read_counter(int counter) ((double)count[0] * count[1] / count[2] + 0.5); } } + /* + * Save the full runtime - to allow normalization during printout: + */ + if (event_id[counter] == EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK)) + runtime_nsecs = count[0]; } /* @@ -190,8 +197,11 @@ static void print_counter(int counter) fprintf(stderr, " %14.6f %-20s (msecs)", msecs, event_name(counter)); } else { - fprintf(stderr, " %14Ld %-20s (events)", + fprintf(stderr, " %14Ld %-20s", count[0], event_name(counter)); + if (runtime_nsecs) + fprintf(stderr, " # %12.3f M/sec", + (double)count[0]/runtime_nsecs*1000.0); } if (scaled) fprintf(stderr, " (scaled from %.2f%%)",