From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wu Fengguang <fengguang.wu@intel.com>
Subject: Re: [PATCH] vmscan: synchronous lumpy reclaim don't call
 congestion_wait()
Date: Sun, 1 Aug 2010 18:42:32 +0800
Message-ID: <20100801104232.GA17573@localhost>
References: <20100801085134.GA15577@localhost>
 <20100801180751.4B0E.A69D9226@jp.fujitsu.com>
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Cc: Andrew Morton <akpm@linux-foundation.org>, Mel Gorman <mel@csn.ul.ie>,
	Minchan Kim <minchan.kim@gmail.com>,
	Andy Whitcroft <apw@shadowen.org>, Rik van Riel <riel@redhat.com>,
	Christoph Hellwig <hch@infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	Dave Chinner <david@fromorbit.com>,
	Chris Mason <chris.mason@oracle.com>, Nick Piggin <npiggin@suse.de>,
	Johannes Weiner <hannes@cmpxchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Andreas Mohr <andi@lisas.de>, Bill Davidsen <davidsen@tmr.com>,
	Ben Gamari <bgamari.foss@gmail.com>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
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> If the system 512MB memory, DEF_PRIORITY mean 128kB scan and It takes 4096
> shrink_page_list() calls to scan 128kB (i.e. 128kB/32=4096) memory.

Err you must forgot the page size.

128kB means 128kB/4kB=32 pages which fit exactly into one
SWAP_CLUSTER_MAX batch. The shrink_page_list() call times
has nothing to do DEF_PRIORITY.

Thanks,
Fengguang

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