Message-ID: <52FA151C.9040205@hurleysoftware.com>
Date: Tue, 11 Feb 2014 07:18:36 -0500
From: Peter Hurley <peter@hurleysoftware.com>
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To: Arnaldo Carvalho de Melo <acme@redhat.com>
CC: David Ahern <dsahern@gmail.com>, Stephane Eranian <eranian@google.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>, "mingo@elte.hu" <mingo@elte.hu>,
        Jiri Olsa <jolsa@redhat.com>, Eric Dumazet <edumazet@google.com>
Subject: Re: [BUG] perf top: --stdio causes continuous refresh
References: <CABPqkBSkSbWvdRu3iEtNvHhfV4J4sALHvdd40hZTcGxLe576yQ@mail.gmail.com> <20140206135627.GA26955@infradead.org> <CABPqkBS5qLDYyyv=n8fT4K+hA3uRWYmQOZmO+n-UE9=X=cEFzQ@mail.gmail.com> <20140206140705.GB26955@infradead.org> <20140206140936.GC26955@infradead.org> <CABPqkBRwy=0pnmm657TwV25GiYbpkqC1E8+cUGLEUbqxO=Gusw@mail.gmail.com> <52F3CAE3.7060007@gmail.com> <20140210210358.GD3202@infradead.org> <52F987CE.7010300@hurleysoftware.com> <20140211121411.GA4368@infradead.org>
In-Reply-To: <20140211121411.GA4368@infradead.org>
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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@hurleysoftware.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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