linux-kernel - Re: [PATCH] perf_events: fix bogus warn_on(_once) in perf_prepare

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Message-ID: <v2lbd4cb8901004081433l7bff8d3cq2f11ca6c222e8e87@mail.gmail.com>
Date:	Thu, 8 Apr 2010 23:33:15 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, paulus@...ba.org,
	davem@...emloft.net, fweisbec@...il.com, robert.richter@....com,
	perfmon2-devel@...ts.sf.net, eranian@...il.com
Subject: Re: [PATCH] perf_events: fix bogus warn_on(_once) in 
	perf_prepare_sample()

On Thu, Apr 8, 2010 at 11:24 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Thu, 2010-04-08 at 23:18 +0200, Stephane Eranian wrote:
>> I am not sure I understand what you mean by buffered PEBS. Are you talking
>> about using PEBS buffer bigger than one entry?
>
> Yep.
>
>> If so, how can you do:
>>   - the LBR based fixups for multiple samples (on PMU interrupt)
>
> Not, so it would be the offset on.
>
Not sure I understand what you mean here.

>>   - attribute PID/TID in system-wide mode
>
> flush on context switches.
>
cost?
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