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Mel Gorman f35407acce mm: numa: Do not mark PTEs pte_numa when splitting huge pages 
commit abc40bd2eeb77eb7c2effcaf63154aad929a1d5f upstream.

This patch reverts 1ba6e0b50b ("mm: numa: split_huge_page: transfer the
NUMA type from the pmd to the pte"). If a huge page is being split due
a protection change and the tail will be in a PROT_NONE vma then NUMA
hinting PTEs are temporarily created in the protected VMA.

 VM_RW|VM_PROTNONE
|-----------------|
      ^
      split here

In the specific case above, it should get fixed up by change_pte_range()
but there is a window of opportunity for weirdness to happen. Similarly,
if a huge page is shrunk and split during a protection update but before
pmd_numa is cleared then a pte_numa can be left behind.

Instead of adding complexity trying to deal with the case, this patch
will not mark PTEs NUMA when splitting a huge page. NUMA hinting faults
will not be triggered which is marginal in comparison to the complexity
in dealing with the corner cases during THP split.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2014-10-09 12:18:42 -07:00
..
Kconfig mmKconfig: add an option to disable bounce 2013-04-29 15:54:40 -07:00
Kconfig.debug
…
Makefile memcg: add memory.pressure_level events 2013-04-29 15:54:38 -07:00
backing-dev.c bdi: avoid oops on device removal 2014-04-26 17:15:35 -07:00
balloon_compaction.c
…
bootmem.c
…
bounce.c mm/bounce.c: fix a regression where MS_SNAP_STABLE (stable pages snapshotting) was ignored 2013-10-13 16:08:33 -07:00
cleancache.c mm: cleancache: clean up cleancache_enabled 2013-04-30 17:04:01 -07:00
compaction.c mm/compaction: make isolate_freepages start at pageblock boundary 2014-06-16 13:42:53 -07:00
debug-pagealloc.c
…
dmapool.c
…
fadvise.c teach SYSCALL_DEFINE<n> how to deal with long long/unsigned long long 2013-03-03 22:46:22 -05:00
failslab.c
…
filemap.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-05-01 17:51:54 -07:00
filemap_xip.c lift sb_start_write() out of ->write() 2013-04-09 14:12:56 -04:00
fremap.c mm: fix use-after-free in sys_remap_file_pages 2014-01-09 12:24:24 -08:00
frontswap.c frontswap: fix incorrect zeroing and allocation size for frontswap_map 2013-06-12 16:29:46 -07:00
highmem.c
…
huge_memory.c mm: numa: Do not mark PTEs pte_numa when splitting huge pages 2014-10-09 12:18:42 -07:00
hugetlb.c mm: hugetlb: fix copy_hugetlb_page_range() 2014-07-31 12:53:51 -07:00
hugetlb_cgroup.c
…
hwpoison-inject.c
…
init-mm.c
…
internal.h mm: accelerate munlock() treatment of THP pages 2013-02-27 19:10:09 -08:00
interval_tree.c
…
kmemcheck.c
…
kmemleak-test.c
…
kmemleak.c hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
ksm.c mm: close PageTail race 2014-04-03 12:01:05 -07:00
maccess.c
…
madvise.c mm: madvise: complete input validation before taking lock 2013-04-29 15:54:37 -07:00
memblock.c memblock: fix missing comment of memblock_insert_region() 2013-04-29 15:54:38 -07:00
memcontrol.c memcg: reparent charges of children before processing parent 2014-03-23 21:38:20 -07:00
memory-failure.c mm/memory-failure.c: don't let collect_procs() skip over processes for MF_ACTION_REQUIRED 2014-06-30 20:09:42 -07:00
memory.c mm: make fixup_user_fault() check the vma access rights too 2014-06-07 13:25:29 -07:00
memory_hotplug.c mm/memory_hotplug.c: fix printk format warnings 2013-05-24 16:22:52 -07:00
mempolicy.c cpuset,mempolicy: fix sleeping function called from invalid context 2014-07-17 15:58:00 -07:00
mempool.c
…
migrate.c mm: numa: avoid unnecessary work on the failure path 2014-01-09 12:24:23 -08:00
mincore.c
…
mlock.c mm: try_to_unmap_cluster() should lock_page() before mlocking 2014-05-06 07:55:32 -07:00
mm_init.c
…
mmap.c mm: ensure get_unmapped_area() returns higher address than mmap_min_addr 2013-12-04 10:56:39 -08:00
mmu_context.c mm: remove old aio use_mm() comment 2013-05-07 18:38:27 -07:00
mmu_notifier.c mm: mmu_notifier: re-fix freed page still mapped in secondary MMU 2013-05-24 16:22:51 -07:00
mmzone.c
…
mprotect.c mm: fix TLB flush race between migration, and change_protection_range 2014-01-09 12:24:23 -08:00
mremap.c mm, thp: close race between mremap() and split_huge_page() 2014-06-07 13:25:31 -07:00
msync.c
…
nobootmem.c mm, nobootmem: do memset() after memblock_reserve() 2013-04-29 15:54:39 -07:00
nommu.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2013-05-01 07:21:43 -07:00
oom_kill.c oom_kill: add rcu_read_lock() into find_lock_task_mm() 2014-10-05 14:54:15 -07:00
page-writeback.c mm: __set_page_dirty_nobuffers() uses spin_lock_irqsave() instead of spin_lock_irq() 2014-02-20 11:06:11 -08:00
page_alloc.c mm, thp: do not allow thp faults to avoid cpuset restrictions 2014-08-07 14:30:26 -07:00
page_cgroup.c
…
page_io.c Merge branch 'for-3.10/core' of git://git.kernel.dk/linux-block 2013-05-08 10:13:35 -07:00
page_isolation.c
…
pagewalk.c mm/pagewalk.c: fix walk_page_range() access of wrong PTEs 2013-11-13 12:05:34 +09:00
percpu-km.c
…
percpu-vm.c percpu: perform tlb flush after pcpu_map_pages() failure 2014-10-05 14:54:13 -07:00
percpu.c percpu: free percpu allocation info for uniprocessor system 2014-10-05 14:54:13 -07:00
pgtable-generic.c mm: fix TLB flush race between migration, and change_protection_range 2014-01-09 12:24:23 -08:00
process_vm_access.c Fix: compat_rw_copy_check_uvector() misuse in aio, readv, writev, and security keys 2013-03-12 11:05:45 -07:00
quicklist.c
…
readahead.c teach SYSCALL_DEFINE<n> how to deal with long long/unsigned long long 2013-03-03 22:46:22 -05:00
rmap.c mm: fix sleeping function warning from __put_anon_vma 2014-06-30 20:09:42 -07:00
shmem.c shmem: fix nlink for rename overwrite directory 2014-10-05 14:54:11 -07:00
slab.c slab: fix init_lock_keys 2013-07-21 18:21:26 -07:00
slab.h memcg: check that kmem_cache has memcg_params before accessing it 2013-09-07 22:09:58 -07:00
slab_common.c slab_common: fix the check for duplicate slab names 2014-07-31 12:53:50 -07:00
slob.c
…
slub.c slub: Fix calculation of cpu slabs 2014-02-13 13:48:00 -08:00
sparse-vmemmap.c sparse-vmemmap: specify vmemmap population range in bytes 2013-04-29 15:54:35 -07:00
sparse.c mm, hotplug: avoid compiling memory hotremove functions when disabled 2013-04-29 15:54:37 -07:00
swap.c mm: close PageTail race 2014-04-03 12:01:05 -07:00
swap_state.c swap: avoid read_swap_cache_async() race to deadlock while waiting on discard I/O completion 2013-06-12 16:29:45 -07:00
swapfile.c frontswap: fix incorrect zeroing and allocation size for frontswap_map 2013-06-12 16:29:46 -07:00
truncate.c
…
util.c vm_is_stack: use for_each_thread() rather then buggy while_each_thread() 2014-10-05 14:54:16 -07:00
vmalloc.c mm/vmalloc.c: fix an overflow bug in alloc_vmap_area() 2013-11-13 12:05:34 +09:00
vmpressure.c memcg: add memory.pressure_level events 2013-04-29 15:54:38 -07:00
vmscan.c mm: vmscan: clear kswapd's special reclaim powers before exiting 2014-06-30 20:09:42 -07:00
vmstat.c mm: numa: return the number of base pages altered by protection changes 2013-12-08 07:29:27 -08:00