linux-kernel - Re: perf: regression with PERF_EVENT_IOC

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Message-ID: <1306249914.18455.43.camel@twins>
Date:	Tue, 24 May 2011 17:11:54 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Vince Weaver <vweaver1@...s.utk.edu>
Cc:	linux-kernel@...r.kernel.org, fbuihuu@...il.com, mingo@...e.hu,
	paulus@...ba.org, acme@...hat.com
Subject: Re: perf: regression with PERF_EVENT_IOC_REFRESH

On Tue, 2011-05-24 at 11:04 -0400, Vince Weaver wrote:
> As an aside, I also wasted 6 hours last night finding out that you don't 
> get signaled on overflow if you don't have a ring-buffer mmap()ed, even
> if you never read from the buffer and you only are interested in counting
> the number of overflows. 

That sounds like something we could fix, let me investigate.

>  I should stop complaining though or you'll
> start telling me to fix the documentation.  Which maybe I would do if I 
> didn't spend all my time writing code to reproduce problems in the perf 
> ABI for bisection purposes. 

Both are appreciated.
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