Vlastimil Babka f8224aa5a0 mm, compaction: do not recheck suitable_migration_target under lock ... isolate_freepages_block() rechecks if the pageblock is suitable to be a target for migration after it has taken the zone->lock. However, the check has been optimized to occur only once per pageblock, and compact_checklock_irqsave() might be dropping and reacquiring lock, which means somebody else might have changed the pageblock's migratetype meanwhile. Furthermore, nothing prevents the migratetype to change right after isolate_freepages_block() has finished isolating. Given how imperfect this is, it's simpler to just rely on the check done in isolate_freepages() without lock, and not pretend that the recheck under lock guarantees anything. It is just a heuristic after all. Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com> Acked-by: Minchan Kim <minchan@kernel.org> Acked-by: Mel Gorman <mgorman@suse.de> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Michal Nazarewicz <mina86@mina86.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Christoph Lameter <cl@linux.com> Cc: Rik van Riel <riel@redhat.com> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2014-10-09 22:25:54 -04:00
..
backing-dev.c
balloon_compaction.c
bootmem.c
cleancache.c
cma.c	mm: cma: adjust address limit to avoid hitting low/high memory boundary	2014-10-09 22:25:53 -04:00
compaction.c	mm, compaction: do not recheck suitable_migration_target under lock	2014-10-09 22:25:54 -04:00
debug-pagealloc.c
dmapool.c
early_ioremap.c
fadvise.c
failslab.c
filemap_xip.c
filemap.c
fremap.c
frontswap.c
gup.c
highmem.c
huge_memory.c	mm, THP: don't hold mmap_sem in khugepaged when allocating THP	2014-10-09 22:25:53 -04:00
hugetlb_cgroup.c
hugetlb.c
hwpoison-inject.c
init-mm.c
internal.h
interval_tree.c
iov_iter.c
Kconfig
Kconfig.debug
kmemcheck.c	mm/slab_common: move kmem_cache definition to internal header	2014-10-09 22:25:50 -04:00
kmemleak-test.c
kmemleak.c
ksm.c
list_lru.c
maccess.c
madvise.c
Makefile
memblock.c
memcontrol.c
memory_hotplug.c	memory-hotplug: add sysfs valid_zones attribute	2014-10-09 22:25:52 -04:00
memory-failure.c
memory.c
mempolicy.c
mempool.c
migrate.c
mincore.c
mlock.c
mm_init.c
mmap.c	mm/mmap.c: whitespace fixes	2014-10-09 22:25:52 -04:00
mmu_context.c
mmu_notifier.c
mmzone.c
mprotect.c
mremap.c
msync.c
nobootmem.c
nommu.c
oom_kill.c
page_alloc.c	mm, compaction: do not count compact_stall if all zones skipped compaction	2014-10-09 22:25:53 -04:00
page_cgroup.c
page_io.c
page_isolation.c
page-writeback.c
pagewalk.c
percpu-km.c
percpu-vm.c
percpu.c
pgtable-generic.c
process_vm_access.c
quicklist.c
readahead.c
rmap.c
shmem.c
slab_common.c	mm/slab_common: commonize slab merge logic	2014-10-09 22:25:51 -04:00
slab.c	mm/slab: use percpu allocator for cpu cache	2014-10-09 22:25:51 -04:00
slab.h	mm/slab: use percpu allocator for cpu cache	2014-10-09 22:25:51 -04:00
slob.c	mm/sl[ao]b: always track caller in kmalloc_(node_)track_caller()	2014-10-09 22:25:50 -04:00
slub.c	mm/slab_common: commonize slab merge logic	2014-10-09 22:25:51 -04:00
sparse-vmemmap.c
sparse.c
swap_state.c
swap.c
swapfile.c
truncate.c
util.c
vmacache.c
vmalloc.c
vmpressure.c
vmscan.c	mm, compaction: defer each zone individually instead of preferred zone	2014-10-09 22:25:53 -04:00
vmstat.c
workingset.c
zbud.c
zpool.c
zsmalloc.c
zswap.c