linux-kernel - Re: [PATCH 7/9] Revert "mm: have order > 0 compaction start off where it left"

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Message-ID: <20120921175242.GG6665@optiplex.redhat.com>
Date:	Fri, 21 Sep 2012 14:52:43 -0300
From:	Rafael Aquini <aquini@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Richard Davies <richard@...chsys.com>,
	Shaohua Li <shli@...nel.org>, Rik van Riel <riel@...hat.com>,
	Avi Kivity <avi@...hat.com>,
	QEMU-devel <qemu-devel@...gnu.org>, KVM <kvm@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 7/9] Revert "mm: have order > 0 compaction start off
 where it left"

On Fri, Sep 21, 2012 at 11:46:21AM +0100, Mel Gorman wrote:
> This reverts commit 7db8889a (mm: have order > 0 compaction start off
> where it left) and commit de74f1cc (mm: have order > 0 compaction start
> near a pageblock with free pages). These patches were a good idea and
> tests confirmed that they massively reduced the amount of scanning but
> the implementation is complex and tricky to understand. A later patch
> will cache what pageblocks should be skipped and reimplements the
> concept of compact_cached_free_pfn on top for both migration and
> free scanners.
> 
> Signed-off-by: Mel Gorman <mgorman@...e.de>
> Acked-by: Rik van Riel <riel@...hat.com>
> ---

Acked-by: Rafael Aquini <aquini@...hat.com>

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