linux-kernel - Re: [PATCH] perf_events: fix and improve x86 event scheduling

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Date:	Fri, 11 Nov 2011 15:29:35 +0100
From:	Robert Richter <robert.richter@....com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Stephane Eranian <eranian@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"ming.m.lin@...el.com" <ming.m.lin@...el.com>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>
Subject: Re: [PATCH] perf_events: fix and improve x86 event scheduling

On 10.11.11 19:52:47, Peter Zijlstra wrote:
> IIRC, Robert's proposal limits the rewind stack to 1, which, if my mind
> didn't completely stop working, should end up being something like
> O(n^3). Now I don't know if Robert's thing is perfect for AMD F15 or if
> there's still some odd fail cases, but since he's from AMD I suspect its
> good enough in practice.

Yes, patches are ok for AMD F15.

> In fact, I almost merged his code, my only complaint was a lack of
> comments and having had to spend several hours to fully understand the
> thing a few months ago, I felt it really could use some since I didn't
> want to have to spend that amount of effort every time I'd have to look
> at the thing.

Will repost an updated version.

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center

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