path: root/mm/memory_hotplug.c
diff options
authorMel Gorman <>2012-01-12 17:19:43 -0800
committerLinus Torvalds <>2012-01-12 20:13:09 -0800
commita6bc32b899223a877f595ef9ddc1e89ead5072b8 (patch)
treea9529f7af2cf8e77bb6670acea32169c891a2b76 /mm/memory_hotplug.c
parent66199712e9eef5aede09dbcd9dfff87798a66917 (diff)
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. [ This patch is heavily based on Andrea's work] [ fix fs/nfs/write.c build] [ fix fs/btrfs/disk-io.c build] Signed-off-by: Mel Gorman <> Reviewed-by: Rik van Riel <> Cc: Andrea Arcangeli <> Cc: Minchan Kim <> Cc: Dave Jones <> Cc: Jan Kara <> Cc: Andy Isaacson <> Cc: Nai Xia <> Cc: Johannes Weiner <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'mm/memory_hotplug.c')
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)