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perf stat: Don't show counter information when workload fails

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When starting a workload 'stat' wasn't using prepare_workload evlist
method's signal based exec() error reporting mechanism.

Use it so that the we don't report 'not counted' counters.

Before:

  [acme@zoo linux]$ perf stat dfadsfa
  dfadsfa: No such file or directory

   Performance counter stats for 'dfadsfa':

       <not counted>      task-clock
       <not counted>      context-switches
       <not counted>      cpu-migrations
       <not counted>      page-faults
       <not counted>      cycles
       <not counted>      stalled-cycles-frontend
     <not supported>      stalled-cycles-backend
       <not counted>      instructions
       <not counted>      branches
       <not counted>      branch-misses

         0.001831462 seconds time elapsed

  [acme@zoo linux]$

After:

  [acme@zoo linux]$ perf stat dfadsfa
  dfadsfa: No such file or directory
  [acme@zoo linux]$

Reported-by: David Ahern <dsahern@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-5yui3bv7e3hitxucnjsn6z8q@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2013-12-28 15:45:08 -03:00
parent 1341f3e4c0
commit 6af206fd91
1 changed files with 25 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
tools/perf/builtin-stat.c
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@ -509,6 +509,18 @@ static void handle_initial_delay(void)
}
}
static volatile bool workload_exec_failed;
/*
* perf_evlist__prepare_workload will send a SIGUSR1
* if the fork fails, since we asked by setting its
* want_signal to true.
*/
static void workload_exec_failed_signal(int signo __maybe_unused)
{
workload_exec_failed = true;
}
static int __run_perf_stat(int argc, const char **argv)
{
char msg[512];
@ -529,7 +541,7 @@ static int __run_perf_stat(int argc, const char **argv)
if (forks) {
if (perf_evlist__prepare_workload(evsel_list, &target, argv,
false, false) < 0) {
false, true) < 0) {
perror("failed to prepare workload");
return -1;
}
@ -584,6 +596,14 @@ static int __run_perf_stat(int argc, const char **argv)
clock_gettime(CLOCK_MONOTONIC, &ref_time);
if (forks) {
/*
* perf_evlist__prepare_workload will, after we call
* perf_evlist__start_Workload, send a SIGUSR1 if the exec call
* fails, that we will catch in workload_signal to flip
* workload_exec_failed.
*/
signal(SIGUSR1, workload_exec_failed_signal);
perf_evlist__start_workload(evsel_list);
handle_initial_delay();
@ -594,6 +614,10 @@ static int __run_perf_stat(int argc, const char **argv)
}
}
wait(&status);
if (workload_exec_failed)
return -1;
if (WIFSIGNALED(status))
psignal(WTERMSIG(status), argv[0]);
} else {