linux-kernel - Re: [PATCH v2 2/2] vmscan: shrink_slab() require number of lru

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Message-ID: <alpine.DEB.2.00.1007080901460.9707@router.home>
Date:	Thu, 8 Jul 2010 09:04:18 -0500 (CDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH v2 2/2] vmscan: shrink_slab() require number of lru_pages,
 not page order

On Thu, 8 Jul 2010, KOSAKI Motohiro wrote:

> Fix simple argument error. Usually 'order' is very small value than
> lru_pages. then it can makes unnecessary icache dropping.

AFAICT this is not argument error but someone changed the naming of the
parameter. The "lru_pages" parameter is really a division factor affecting
the number of pages scanned. This patch increases this division factor
significantly and therefore reduces the number of items scanned during
zone_reclaim.


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