linux-kernel - Re: [PATCH 2/2] page-allocator: Maintain rolling count of pages to free from the PCP

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Message-ID: <28c262360908280649j2920445ekf5625eb0e86752a4@mail.gmail.com>
Date:	Fri, 28 Aug 2009 22:49:59 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] page-allocator: Maintain rolling count of pages to 
	free from the PCP

On Fri, Aug 28, 2009 at 5:44 PM, Mel Gorman<mel@....ul.ie> wrote:
> When round-robin freeing pages from the PCP lists, empty lists may be
> encountered. In the event one of the lists has more pages than another,
> there may be numerous checks for list_empty() which is undesirable. This
> patch maintains a count of pages to free which is incremented when empty
> lists are encountered. The intention is that more pages will then be freed
> from fuller lists than the empty ones reducing the number of empty list
> checks in the free path.
>
> Signed-off-by: Mel Gorman <mel@....ul.ie>
Reviewed-by: Minchan Kim <minchan.kim@...il.com>

I like this idea. :)
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