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

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Date:	Tue, 11 Feb 2014 07:18:36 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
CC:	David Ahern <dsahern@...il.com>,
	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

On 02/11/2014 07:14 AM, Arnaldo Carvalho de Melo wrote:
> Em Mon, Feb 10, 2014 at 09:15:42PM -0500, Peter Hurley escreveu:
>>> Bisected it down to:
>
>>> eb3e4668bd9e0bbda592e830e889f137e44ec9e4 is the first bad commit
>>> Author: Peter Hurley <peter@...leysoftware.com>
>>> Date:   Mon Dec 2 14:24:42 2013 -0500
>
>>>      n_tty: Un-inline slow-path n_tty_receive_char()
>
>>> In a hurry now, will continue later, trying to understand what is the problem
>>> introduced by the above cset...
>
>>> Need to revert just this one to confirm that it is the culprit, etc.
>
>> Thanks for the report and bisect. Seems unlikely this commit is the
>> cause, but very likely to be some change I made since 3.13, since
>> I can repro on 3.14-rc1 but not on 3.13.2 -stable. I can also repro
>> this on 3.12 + the patch stack from me for 3.13 and 3.14.
>
>> I'm looking into this now.
>
> I just reverted just this cset and the problem persisted, so I'll wait
> for you on this one :-)

I did the same with the same result. So I'm re-bisecting on one machine
and tracing on another.

Regards,
Peter Hurley

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