Re: [tip:perfcounters/core] perf stat: handle Ctrl-C
From: Paul Mackerras
Date: Thu May 28 2009 - 07:10:19 EST
tip-bot for Ingo Molnar writes:
> perf stat: handle Ctrl-C
> Before this change, if a long-running perf stat workload was Ctrl-C-ed,
> the utility exited without displaying statistics.
> After the change, the Ctrl-C gets propagated into the workload (and
> causes its early exit there), but perf stat itself will still continue
> to run and will display counter results.
> This is useful to run open-ended workloads, let them run for
> a while, then Ctrl-C them to get the stats.
Unfortunately it means that if you do e.g.
$ while true; do perf stat something; done
it's impossible to kill the loop with ctrl-C. To fix this we need to
make perf stat kill itself with the signal after printing the results,
so bash sees the died-due-to-signal exit status and stops the loop.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/