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Date:	Thu, 06 Feb 2014 10:48:19 -0700
From:	David Ahern <dsahern@...il.com>
To:	Stephane Eranian <eranian@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
CC:	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

On 2/6/14, 8:24 AM, Stephane Eranian wrote:
> On Thu, Feb 6, 2014 at 3:09 PM, Arnaldo Carvalho de Melo
> <acme@...hat.com> wrote:
>> Em Thu, Feb 06, 2014 at 12:07:05PM -0200, Arnaldo Carvalho de Melo escreveu:
>>> Em Thu, Feb 06, 2014 at 02:58:01PM +0100, Stephane Eranian escreveu:
>>>> On Thu, Feb 6, 2014 at 2:56 PM, Arnaldo Carvalho de Melo
>>>> <acme@...hat.com> wrote:
>>>>> Em Wed, Feb 05, 2014 at 10:25:09PM +0100, Stephane Eranian escreveu:
>>>>>> If you run perf top on 3.14 but you force --stdio mode, perf top
>>>>>> goes crazy and constantly refreshes the output.
>>>
>>>>>> It does that with many older versions of the perf as well on 3.14.
>>>>>> It runs fine with newt mode.
>>>
>>>>>> Works fine with my 3.11 kernel. So something must be broken
>>>>>> with 3.14.
>>>
>>>>>> Can you reproduce the problem as well?
>>>
>>>>> Not so far, using my perf/urgent branch:
>>>
>>>> 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.

David

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