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author | Mel Gorman <mgorman@suse.de> | 2012-01-13 02:19:43 +0100 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-01-13 05:13:09 +0100 |
commit | a6bc32b899223a877f595ef9ddc1e89ead5072b8 (patch) | |
tree | a9529f7af2cf8e77bb6670acea32169c891a2b76 /mm/memory_hotplug.c | |
parent | mm: page allocator: do not call direct reclaim for THP allocations while comp... (diff) | |
download | linux-a6bc32b899223a877f595ef9ddc1e89ead5072b8.tar.xz linux-a6bc32b899223a877f595ef9ddc1e89ead5072b8.zip |
mm: compaction: introduce sync-light migration for use by compaction
This patch adds a lightweight sync migrate operation MIGRATE_SYNC_LIGHT
mode that avoids writing back pages to backing storage. Async compaction
maps to MIGRATE_ASYNC while sync compaction maps to MIGRATE_SYNC_LIGHT.
For other migrate_pages users such as memory hotplug, MIGRATE_SYNC is
used.
This avoids sync compaction stalling for an excessive length of time,
particularly when copying files to a USB stick where there might be a
large number of dirty pages backed by a filesystem that does not support
->writepages.
[aarcange@redhat.com: This patch is heavily based on Andrea's work]
[akpm@linux-foundation.org: fix fs/nfs/write.c build]
[akpm@linux-foundation.org: fix fs/btrfs/disk-io.c build]
Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Andy Isaacson <adi@hexapodia.org>
Cc: Nai Xia <nai.xia@gmail.com>
Cc: Johannes Weiner <jweiner@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory_hotplug.c')
-rw-r--r-- | mm/memory_hotplug.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 2168489c0bc9..6629fafd6ce4 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -809,7 +809,7 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) } /* this function returns # of failed pages */ ret = migrate_pages(&source, hotremove_migrate_alloc, 0, - true, true); + true, MIGRATE_SYNC); if (ret) putback_lru_pages(&source); } |