linux-kernel - Re: [PATCH] Re: kswapd stuck using 100% CPU

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Message-ID: <CAOJsxLGcoxxdhe2sNmAbC2e5afnZm9960XxBjY+QoCoc0RRb2w@mail.gmail.com>
Date:	Mon, 26 Mar 2012 13:40:41 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Rik van Riel <riel@...hat.com>, Anton Blanchard <anton@...ba.org>,
	aarcange@...hat.com, akpm@...ux-foundation.org, hughd@...gle.com,
	lkml <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] Re: kswapd stuck using 100% CPU

On Mon, Mar 26, 2012 at 12:32 PM, Mel Gorman <mel@....ul.ie> wrote:
> On Sat, Mar 24, 2012 at 10:26:21AM -0400, Rik van Riel wrote:
>>
>> Only test compaction_suitable if the kernel is built with CONFIG_COMPACTION,
>> otherwise the stub compaction_suitable function will always return
>> COMPACT_SKIPPED and send kswapd into an infinite loop.
>>
>> Signed-off-by: Rik van Riel <riel@...hat.com>
>> Reported-by: Anton Blanchard <anton@...ba.org>
>
> Acked-by: Mel Gorman <mel@....ul.ie>

The API looks fragile and this patch isn't exactly making it any
better. Why don't we make compaction_suitable() return something other
than COMPACT_SKIPPED for !CONFIG_COMPACTION case?

                        Pekka
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