linux-kernel - Re: [PATCH 6/8] Revert "mm: compaction: make isolate_lru

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Message-ID: <20111121125717.GE19415@suse.de>
Date:	Mon, 21 Nov 2011 12:57:17 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	linux-mm@...ck.org, Minchan Kim <minchan.kim@...il.com>,
	Jan Kara <jack@...e.cz>, Andy Isaacson <adi@...apodia.org>,
	Johannes Weiner <jweiner@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/8] Revert "mm: compaction: make isolate_lru_page()
 filter-aware"

On Sat, Nov 19, 2011 at 08:54:18PM +0100, Andrea Arcangeli wrote:
> This reverts commit
> 39deaf8585152f1a35c1676d3d7dc6ae0fb65967.
> 
> PageDirty is non blocking for compaction (unlike for
> mm/vmscan.c:may_writepage) so async compaction should include it.
> 

It blocks if fallback_migrate_page() is used which happens if the
underlying filesystem does not support ->migratepage.

-- 
Mel Gorman
SUSE Labs
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