linux-kernel - Re: [PATCH 3/4] tracing, page-allocator: Add trace event for page traffic related to the buddy lists

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Message-ID: <4A71A37B.3030306@redhat.com>
Date:	Thu, 30 Jul 2009 09:43:23 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mel@....ul.ie>
CC:	Larry Woodman <lwoodman@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH 3/4] tracing, page-allocator: Add trace event for page
 traffic related to the buddy lists

Mel Gorman wrote:
> The page allocation trace event reports that a page was successfully allocated
> but it does not specify where it came from. When analysing performance,
> it can be important to distinguish between pages coming from the per-cpu
> allocator and pages coming from the buddy lists as the latter requires the
> zone lock to the taken and more data structures to be examined.

Acked-by: Rik van Riel <riel@...hat.com>

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