linux-kernel - Re: [tip:perfcounters/core] perf stat: handle Ctrl-C

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Date:	Fri, 29 May 2009 11:06:42 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Paul Mackerras <paulus@...ba.org>, mingo@...hat.com, hpa@...or.com,
	acme@...hat.com, linux-kernel@...r.kernel.org, tglx@...utronix.de,
	cjashfor@...ux.vnet.ibm.com, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perfcounters/core] perf stat: handle Ctrl-C


* Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> On Thu, 2009-05-28 at 21:09 +1000, Paul Mackerras wrote:
> > 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.
> 
> Yep, just ran into the same..
> 
> ^Z kill $! worked though, but that's not ideal.

would be nice to have a fix for this - i suspect people will run 
into this frequently.

	Ingo
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