From: Christoph Lameter <clameter@sgi.com>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Mel Gorman <mel@skynet.ie>,
linux-mm@kvack.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/11] Add __GFP_MOVABLE flag and update callers
Date: Fri, 24 Nov 2006 09:59:14 -0800 (PST) [thread overview]
Message-ID: <Pine.LNX.4.64.0611240955170.24649@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0611230906110.27596@woody.osdl.org>
On Thu, 23 Nov 2006, Linus Torvalds wrote:
> And the assumption would be that if it's MOVABLE, then it's obviously a
> USER allocation (it it can fail much more eagerly - that's really what the
> whole USER bit ends up meaning internally).
We can probably make several types of kernel allocations movable if there
would be some benefit from it.
Mel already has a problem with mlocked user pages in the movable section.
If this is fixed by using page migration to move the mlocked pages then we
can likely make addititional classes kernel pages also movable and reduce
the amount of memory that is unmovable. If we have more movable pages then
the defrag can work more efficiently. Having most pages movable will also
help to make memory unplug a reality.
So please do not require movable pages to be user allocations.
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next prev parent reply other threads:[~2006-11-24 17:59 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-21 22:50 [PATCH 0/11] Avoiding fragmentation with page clustering v27 Mel Gorman
2006-11-21 22:50 ` [PATCH 1/11] Add __GFP_MOVABLE flag and update callers Mel Gorman
2006-11-21 23:30 ` Christoph Lameter
2006-11-21 23:43 ` Mel Gorman
2006-11-21 23:51 ` Dave Hansen
2006-11-22 0:44 ` Linus Torvalds
2006-11-23 16:36 ` Mel Gorman
2006-11-23 17:11 ` Linus Torvalds
2006-11-24 10:44 ` Mel Gorman
2006-11-24 19:57 ` Hugh Dickins
2006-11-24 20:13 ` Mel Gorman
2006-11-24 21:06 ` Hugh Dickins
2006-11-25 11:47 ` Mel Gorman
2006-11-25 19:01 ` Linus Torvalds
2006-11-26 0:44 ` Hugh Dickins
2006-11-27 16:32 ` Mel Gorman
2006-11-27 17:28 ` Christoph Lameter
2006-11-27 19:48 ` Add __GFP_MOVABLE for callers to flag allocations that may be migrated Mel Gorman
2006-11-24 17:59 ` Christoph Lameter [this message]
2006-11-24 18:11 ` [PATCH 1/11] Add __GFP_MOVABLE flag and update callers Linus Torvalds
2006-11-24 20:04 ` Mel Gorman
2006-11-22 2:25 ` Christoph Lameter
2006-11-23 15:00 ` Mel Gorman
2006-11-21 22:51 ` [PATCH 2/11] Split the free lists for movable and unmovable allocations Mel Gorman
2006-11-21 22:51 ` [PATCH 3/11] Choose pages from the per-cpu list based on migration type Mel Gorman
2006-11-21 22:51 ` [PATCH 4/11] Add a configure option for page clustering Mel Gorman
2006-11-21 22:52 ` [PATCH 5/11] Drain per-cpu lists when high-order allocations fail Mel Gorman
2006-11-21 22:52 ` [PATCH 6/11] Move free pages between lists on steal Mel Gorman
2006-11-21 22:52 ` [PATCH 7/11] Mark short-lived and reclaimable kernel allocations Mel Gorman
2006-11-21 22:53 ` [PATCH 8/11] [DEBUG] Add statistics Mel Gorman
2006-11-21 22:53 ` [PATCH 9/11] Add a bitmap that is used to track flags affecting a block of pages Mel Gorman
2006-11-21 22:53 ` [PATCH 10/11] Remove dependency on page->flag bits Mel Gorman
2006-11-21 22:54 ` [PATCH 11/11] Use pageblock flags for page clustering Mel Gorman
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