perf stat: Analyze front-end and back-end stall counts
authorIngo Molnar <mingo@elte.hu>
Fri, 29 Apr 2011 11:49:08 +0000 (13:49 +0200)
committerIngo Molnar <mingo@elte.hu>
Fri, 29 Apr 2011 12:35:55 +0000 (14:35 +0200)
commitd3d1e86da07b4565815e3dbcd082f53017d215f8
treec2fad06e57607b32d943d6b590325ae5d8ef3d01
parent129c04cb8ce2e4bf3f17223f58ef16aa8a2cb3b8
perf stat: Analyze front-end and back-end stall counts

Sample output:

 Performance counter stats for './loop_1b':

        873.691065 task-clock               #    1.000 CPUs utilized
                 1 context-switches         #    0.000 M/sec
                 1 CPU-migrations           #    0.000 M/sec
                96 page-faults              #    0.000 M/sec
     2,012,637,222 cycles                   #    2.304 GHz                      (66.58%)
     1,001,397,911 stalled-cycles-frontend  #   49.76% frontend cycles idle     (66.58%)
         7,523,398 stalled-cycles-backend   #    0.37%  backend cycles idle     (66.76%)
     2,004,551,046 instructions             #    1.00  insns per cycle
                                            #    0.50  stalled cycles per insn  (66.80%)
     1,001,304,992 branches                 # 1146.063 M/sec                    (66.76%)
            39,453 branch-misses            #    0.00% of all branches          (66.64%)

        0.874046121  seconds time elapsed

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/n/tip-7y40wib8n003io7hjpn1dsrm@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
tools/perf/builtin-stat.c
tools/perf/util/parse-events.c