linux-kernel - Re: [PATCH] mm: Check if any page in a pageblock is reserved before marking it MIGRATE

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Message-ID: <k2g28c262361004052115ie21bd036hcbdbdb7750f2942b@mail.gmail.com>
Date:	Tue, 6 Apr 2010 13:15:12 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Arve Hjønnevåg <arve@...roid.com>
Cc:	Mel Gorman <mel@....ul.ie>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	TAO HU <tghk48@...orola.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	"Ye Yuan.Bo-A22116" <yuan-bo.ye@...orola.com>,
	Chang Qing-A21550 <Qing.Chang@...orola.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] mm: Check if any page in a pageblock is reserved before 
	marking it MIGRATE_RESERVE

On Tue, Apr 6, 2010 at 12:09 PM, Arve Hjønnevåg <arve@...roid.com> wrote:
> This fixes a problem where the first pageblock got marked MIGRATE_RESERVE even
> though it only had a few free pages. This in turn caused no contiguous memory
> to be reserved and frequent kswapd wakeups that emptied the caches to get more
> contiguous memory.

It would be better to add following your description of previous mail thread.
It can help others understand it in future.

On Fri, Apr 02, 2010 at 05:59:00PM -0700, Arve Hj?nnev?g wrote:
...
"I think this happens by default on arm. The kernel starts at offset
0x8000 to leave room for boot parameters, and in recent kernel
versions (>~2.6.26-29) this memory is freed."


-- 
Kind regards,
Minchan Kim
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