linux-kernel - Re: [PATCH 0/7] Memory Compaction v2

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Message-ID: <20070619165841.GG17109@skynet.ie>
Date:	Tue, 19 Jun 2007 17:58:41 +0100
From:	mel@...net.ie (Mel Gorman)
To:	Christoph Lameter <clameter@....com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	kamezawa.hiroyu@...fujitsu.com
Subject: Re: [PATCH 0/7] Memory Compaction v2

On (18/06/07 10:24), Christoph Lameter didst pronounce:
> On Mon, 18 Jun 2007, Mel Gorman wrote:
> 
> > The patchset implements memory compaction for the page allocator reducing
> > external fragmentation so that free memory exists as fewer, but larger
> > contiguous blocks. Instead of being a full defragmentation solution,
> > this focuses exclusively on pages that are movable via the page migration
> > mechanism.
> 
> We need an additional facility at some point that allows the moving of 
> pages that are not on the LRU. Such support seems to be possible
> for page table pages and slab pages.

Agreed. When I put this together first, I felt I would be able to isolate
pages of different types on migratelist but that is not the case as migration
would not be able to tell the difference between a LRU page and a pagetable
page. I'll rename cc->migratelist to cc->migratelist_lru with the view to
potentially adding cc->migratelist_pagetable or cc->migratelist_slab later.

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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