linux-kernel - Re: [BUG] perf top: --stdio causes continuous refresh

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Date:	Thu, 6 Feb 2014 17:28:44 -0200
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	David Ahern <dsahern@...il.com>
Cc:	Stephane Eranian <eranian@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"mingo@...e.hu" <mingo@...e.hu>, Jiri Olsa <jolsa@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: [BUG] perf top: --stdio causes continuous refresh

Em Thu, Feb 06, 2014 at 05:21:31PM -0200, Arnaldo Carvalho de Melo escreveu:
> Em Thu, Feb 06, 2014 at 10:48:19AM -0700, David Ahern escreveu:
> > On 2/6/14, 8:24 AM, Stephane Eranian wrote:
> > >On Thu, Feb 6, 2014 at 3:09 PM, Arnaldo Carvalho de Melo
> > >>>>I am using tip.git. Or try 3.11, 3.10.

> > >>But my tests are on top of:

> > >>[acme@...andy linux]$ uname -r
> > >>3.11.4-101.fc18.x86_64

> > >>I thought it was a 3.14ish one, building one to try there...

> > >The kernel must be 3.14-rcX, the tool can be any version.

> > I don't have time to do a git bisect, but I can narrow the window to
> > 3.13-rc6 and 3.14-rc1. Just happened to update a server yesterday.
> > perf-top --stdio runs fine on the former and shows the problem on
> > the latter.
> 
> Humm,
> 
>                 /*
>                  * Either timeout expired or we got an EINTR due to
>                  * SIGWINCH, refresh screen in both cases.
>                  */
>                 switch (poll(&stdin_poll, 1, delay_msecs)) {
 
> And poll is returning 1:
 
>    951.068 ( 0.002 ms): poll(ufds: 0x7ff660befbb0, nfds: 1, timeout_msecs: 2000) = 1

We go to the getc(stdin) and it returns EOF :-\

- Arnaldo
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