linux-kernel - Re: [PATCH v5 1/2] perf record: Propagate exit status of a command line workload

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Message-ID: <20140508082350.GG2844@laptop.programming.kicks-ass.net>
Date:	Thu, 8 May 2014 10:23:50 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Stephane Eranian <eranian@...gle.com>,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCH v5 1/2] perf record: Propagate exit status of a command
 line workload

On Thu, May 08, 2014 at 04:59:53PM +0900, Namhyung Kim wrote:
> Currently perf record doesn't propagate the exit status of a workload
> given by the command line.  But sometimes it'd useful if it's
> propagated so that a monitoring script can handle errors
> appropriately.
> 
> To do that, it got rid of exit handlers and run/call them directly in
> the __cmd_record().  I don't see any reason why those are in a form of
> exit handlers in the first place.  Also it cleaned up the resource
> management code in record__exit().
> 
> With this change, perf record returns the child exit status in case of
> normal termination and send signal to itself when terminated by signal.
> 
> Example run of Stephane's case:
> 
>   $ perf record true && echo yes || echo no
>   [ perf record: Woken up 1 times to write data ]
>   [ perf record: Captured and wrote 0.013 MB perf.data (~589 samples) ]
>   yes
> 
>   $ perf record false && echo yes || echo no
>   [ perf record: Woken up 1 times to write data ]
>   [ perf record: Captured and wrote 0.013 MB perf.data (~589 samples) ]
>   no
> 
> Jiri's case (error in parent):
> 
>   $ perf record -m 10G true && echo yes || echo no
>   rounding mmap pages size to 17179869184 bytes (4194304 pages)
>   failed to mmap with 12 (Cannot allocate memory)
>   no
> 
> And Peter's case (interrupted by signal):
> 
>   $ while :; do perf record sleep 1; done
>   ^C[ perf record: Woken up 1 times to write data ]
>   [ perf record: Captured and wrote 0.014 MB perf.data (~593 samples) ]

Thanks!

Acked-by: Peter Zijlstra <peterz@...radead.org>
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