lkml.org 
[lkml]   [2011]   [Dec]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 05/11] mm: compaction: Determine if dirty pages can be migrated without blocking within ->migratepage
On 12/14/2011 10:41 AM, Mel Gorman wrote:
> Asynchronous compaction is used when allocating transparent hugepages
> to avoid blocking for long periods of time. Due to reports of
> stalling, there was a debate on disabling synchronous compaction
> but this severely impacted allocation success rates. Part of the
> reason was that many dirty pages are skipped in asynchronous compaction
> by the following check;
>
> if (PageDirty(page)&& !sync&&
> mapping->a_ops->migratepage != migrate_page)
> rc = -EBUSY;
>
> This skips over all mapping aops using buffer_migrate_page()
> even though it is possible to migrate some of these pages without
> blocking. This patch updates the ->migratepage callback with a "sync"
> parameter. It is the responsibility of the callback to fail gracefully
> if migration would block.
>
> Signed-off-by: Mel Gorman<mgorman@suse.de>

Reviewed-by: Rik van Riel <riel@redhat.com>

--
All rights reversed


\
 
 \ /
  Last update: 2011-12-16 04:35    [W:0.305 / U:0.384 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site