From: David Ahern <dsahern@gmail.com>
To: Stephane Eranian <eranian@google.com>,
Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: 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
Date: Thu, 06 Feb 2014 10:48:19 -0700 [thread overview]
Message-ID: <52F3CAE3.7060007@gmail.com> (raw)
In-Reply-To: <CABPqkBRwy=0pnmm657TwV25GiYbpkqC1E8+cUGLEUbqxO=Gusw@mail.gmail.com>
On 2/6/14, 8:24 AM, Stephane Eranian wrote:
> On Thu, Feb 6, 2014 at 3:09 PM, Arnaldo Carvalho de Melo
> <acme@redhat.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@redhat.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@ssdandy 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
next prev parent reply other threads:[~2014-02-06 17:48 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-05 21:25 [BUG] perf top: --stdio causes continuous refresh Stephane Eranian
2014-02-05 23:12 ` Stephane Eranian
2014-02-06 13:56 ` Arnaldo Carvalho de Melo
2014-02-06 13:58 ` Stephane Eranian
2014-02-06 14:07 ` Arnaldo Carvalho de Melo
2014-02-06 14:09 ` Arnaldo Carvalho de Melo
2014-02-06 15:24 ` Stephane Eranian
2014-02-06 17:48 ` David Ahern [this message]
2014-02-06 19:21 ` Arnaldo Carvalho de Melo
2014-02-06 19:28 ` Arnaldo Carvalho de Melo
2014-02-06 20:21 ` Stephane Eranian
2014-02-10 21:03 ` Arnaldo Carvalho de Melo
2014-02-11 2:15 ` Peter Hurley
2014-02-11 12:14 ` Arnaldo Carvalho de Melo
2014-02-11 12:18 ` Peter Hurley
2014-02-11 16:49 ` [PATCH] n_tty: Fix poll() when TIME_CHAR and MIN_CHAR == 0 Peter Hurley
2014-02-11 18:31 ` David Ahern
2014-02-11 18:32 ` Eric Dumazet
2014-02-11 20:50 ` Arnaldo Carvalho de Melo
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