linux

iv/linux

History

Minchan Kim 435b405c06 memory-hotplug: fix pages missed by race rather than failing

If race between allocation and isolation in memory-hotplug offline
happens, some pages could be in MIGRATE_MOVABLE of free_list although the
pageblock's migratetype of the page is MIGRATE_ISOLATE.

The race could be detected by get_freepage_migratetype in
__test_page_isolated_in_pageblock.  If it is detected, now EBUSY gets
bubbled all the way up and the hotplug operations fails.

But better idea is instead of returning and failing memory-hotremove, move
the free page to the correct list at the time it is detected.  It could
enhance memory-hotremove operation success ratio although the race is
really rare.

Suggested by Mel Gorman.

[akpm@linux-foundation.org: small cleanup]
Signed-off-by: Minchan Kim <minchan@kernel.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Cc: Xishi Qiu <qiuxishi@huawei.com>
Cc: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2012-10-09 16:22:46 +09:00

acpi

Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux

2012-10-08 07:14:06 +09:00

asm-generic

thp: introduce pmdp_invalidate()

2012-10-09 16:22:29 +09:00

clocksource

arm64: Generic timers support

2012-09-17 13:42:20 +01:00

crypto

crypto: cast6 - fix sparse warnings (symbol was not declared, should be static?)