github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-06-08 14:42:37 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph
397d9c507f
linux/include
History
Mel Gorman 397d9c507f mm: compaction: determine if dirty pages can be migrated without blocking within ->migratepage 
commit b969c4ab9f upstream.

Stable note: Not tracked in Bugzilla. A fix aimed at preserving page
	aging information by reducing LRU list churning had the side-effect
	of reducing THP allocation success rates. This was part of a series
	to restore the success rates while preserving the reclaim fix.

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>
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>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-01 12:27:17 -07:00
..
acpi ACPI: Store SRAT table revision 2012-01-25 17:24:57 -08:00
asm-generic mm: pmd_read_atomic: fix 32bit PAE pmd walk vs pmd_populate SMP race condition 2012-06-10 00:32:57 +09:00
crypto
drm drm/radeon/kms: add new BTC PCI ids 2012-06-10 00:33:04 +09:00
keys libceph: Create a new key type "ceph". 2011-03-29 12:11:24 -07:00
linux mm: compaction: determine if dirty pages can be migrated without blocking within ->migratepage 2012-08-01 12:27:17 -07:00
math-emu
media [media] tuner-core/v4l2-subdev: document that the type field has to be filled in 2011-07-07 15:04:23 -03:00
mtd UBI: fix minor stylistic issues 2011-04-14 11:34:41 +03:00
net bonding: Fix corrupted queue_mapping 2012-07-16 08:47:37 -07:00
pcmcia pcmcia: Make declaration and uses of struct pcmcia_device_id const 2011-05-06 07:46:15 +02:00
rdma Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband 2011-05-26 12:13:57 -07:00
rxrpc Fix common misspellings 2011-03-31 11:26:23 -03:00
scsi [SCSI] libsas: Add option for SATA soft reset 2011-05-26 22:49:33 -05:00
sound ALSA: sb16 - Fix build errors on MIPS and others with 13bit ioctl size 2011-06-30 15:33:57 +02:00
target target: Set additional sense length field in sense data 2012-01-25 17:25:00 -08:00
trace mm: change isolate mode from #define to bitwise type 2012-08-01 12:27:16 -07:00
video OMAPDSS: HDMI: PHY burnout fix 2012-03-12 10:32:59 -07:00
xen xen/xenbus: Reject replies with payload > XENSTORE_PAYLOAD_MAX. 2012-01-25 17:24:41 -08:00
Kbuild