linux-kernel - Re: [PATCH v4 0/4] perf timechart io mode

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Message-ID: <53A9CB6E.5080104@gmail.com>
Date:	Tue, 24 Jun 2014 13:03:10 -0600
From:	David Ahern <dsahern@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>
CC:	Stanislav Fomichev <stfomichev@...dex-team.ru>,
	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	paulus@...ba.org, mingo@...hat.com, acme@...nel.org,
	namhyung@...nel.org, artagnon@...il.com, rusty@...tcorp.com.au,
	bp@...e.de
Subject: Re: [PATCH v4 0/4] perf timechart io mode

On 6/24/14, 12:51 PM, Jiri Olsa wrote:
> On Tue, Jun 24, 2014 at 11:38:44AM -0600, David Ahern wrote:
>> On 6/24/14, 10:57 AM, Stanislav Fomichev wrote:
>>> On Tue, Jun 24, 2014 at 01:10:22PM +0400, Stanislav Fomichev wrote:
>>>>> hum, got this when trying:
>>>>>
>>>>> [jolsa@...va perf]$ sudo ./perf timechart record -I
>>>>> ^C[ perf record: Woken up 2 times to write data ]
>>>>> [ perf record: Captured and wrote 1.071 MB perf.data (~46806 samples) ]
>>>>> [jolsa@...va perf]$ ./perf timechart
>>>>> Invalid previous event (non-zero)!
>>>>> 0x113f80 [0x8]: failed to process type: 68
>>
>> I see this kind of message a lot, but typically in high event use cases
>> (e.g., 100+MB files in a run of a few seconds). I usually increase the map
>> size (-m 4096) and/or bump the priority of perf (-r1) and re-run the test.
>
> maybe we dont need to fail in this case.. seems like it should
> not be hard to detect, wanr and recover? ;-)
>

seems to me it should not be happening at all. It seems like the head 
caught the tail and was not properly detected.

David

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