OpenE2K
/
linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
linux/mm
History
Hugh Dickins 5117b3b835 mm,ksm: FOLL_MIGRATION do migration_entry_wait 
In "ksm: remove old stable nodes more thoroughly" I said that I'd never
seen its WARN_ON_ONCE(page_mapped(page)).  True at the time of writing,
but it soon appeared once I tried fuller tests on the whole series.

It turned out to be due to the KSM page migration itself: unmerge_and_
remove_all_rmap_items() failed to locate and replace all the KSM pages,
because of that hiatus in page migration when old pte has been replaced
by migration entry, but not yet by new pte.  follow_page() finds no page
at that instant, but a KSM page reappears shortly after, without a
fault.

Add FOLL_MIGRATION flag, so follow_page() can do migration_entry_wait()
for KSM's break_cow().  I'd have preferred to avoid another flag, and do
it every time, in case someone else makes the same easy mistake; but did
not find another transgressor (the common get_user_pages() is of course
safe), and cannot be sure that every follow_page() caller is prepared to
sleep - ia64's xencomm_vtop()? Now, THP's wait_split_huge_page() can
already sleep there, since anon_vma locking was changed to mutex, but
maybe that's somehow excluded.

Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Petr Holasek <pholasek@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Izik Eidus <izik.eidus@ravellosystems.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2013-02-23 17:50:23 -08:00
..
Kconfig memory-hotplug: implement register_page_bootmem_info_section of sparse-vmemmap 2013-02-23 17:50:12 -08:00
Kconfig.debug
…
Makefile mm: introduce a common interface for balloon pages mobility 2012-12-11 17:22:26 -08:00
backing-dev.c bdi: allow block devices to say that they require stable page writes 2013-02-21 17:22:19 -08:00
balloon_compaction.c mm: introduce a common interface for balloon pages mobility 2012-12-11 17:22:26 -08:00
bootmem.c mm: Add alloc_bootmem_low_pages_nopanic() 2013-01-29 19:32:59 -08:00
bounce.c block: optionally snapshot page contents to provide stable pages during write 2013-02-21 17:22:20 -08:00
cleancache.c ->encode_fh() API change 2012-05-29 23:28:33 -04:00
compaction.c mm: add & use zone_end_pfn() and zone_spans_pfn() 2013-02-23 17:50:20 -08:00
debug-pagealloc.c
…
dmapool.c dmapool: make DMAPOOL_DEBUG detect corruption of free marker 2012-12-11 17:22:24 -08:00
fadvise.c mm/fadvise.c: drain all pagevecs if POSIX_FADV_DONTNEED fails to discard all pages 2013-02-23 17:50:23 -08:00
failslab.c
…
filemap.c mm: only enforce stable page writes if the backing device requires it 2013-02-21 17:22:19 -08:00
filemap_xip.c mm: move all mmu notifier invocations to be done outside the PT lock 2012-10-09 16:22:58 +09:00
fremap.c mm: introduce VM_POPULATE flag to better deal with racy userspace programs 2013-02-23 17:50:11 -08:00
frontswap.c frontswap: support exclusive gets if tmem backend is capable 2012-09-21 10:38:12 -04:00
highmem.c Some nice cleanups, and even a patch my wife did as a "live" demo for 2012-12-20 08:37:05 -08:00
huge_memory.c mm: use NUMA_NO_NODE 2013-02-23 17:50:21 -08:00
hugetlb.c mm: use long type for page counts in mm_populate() and get_user_pages() 2013-02-23 17:50:22 -08:00
hugetlb_cgroup.c mm/hugetlb: create hugetlb cgroup file in hugetlb_init 2012-12-18 15:02:15 -08:00
hwpoison-inject.c memcg: rename config variables 2012-07-31 18:42:43 -07:00
init-mm.c
…
internal.h mm: directly use __mlock_vma_pages_range() in find_extend_vma() 2013-02-23 17:50:11 -08:00
interval_tree.c mm: add CONFIG_DEBUG_VM_RB build option 2012-10-09 16:22:42 +09:00
kmemcheck.c
…
kmemleak-test.c
…
kmemleak.c mm: add & use zone_end_pfn() and zone_spans_pfn() 2013-02-23 17:50:20 -08:00
ksm.c mm,ksm: FOLL_MIGRATION do migration_entry_wait 2013-02-23 17:50:23 -08:00
maccess.c
…
madvise.c mm: make madvise(MADV_WILLNEED) support swap file prefetch 2013-02-23 17:50:10 -08:00
memblock.c mm/memblock.c: use CONFIG_HAVE_MEMBLOCK_NODE_MAP to protect movablecore_map in memblock_overlaps_region(). 2013-02-23 17:50:14 -08:00
memcontrol.c memcg: stop warning on memcg_propagate_kmem 2013-02-23 17:50:22 -08:00
memory-failure.c HWPOISON: change order of error_states[]'s elements 2013-02-23 17:50:22 -08:00
memory.c mm,ksm: FOLL_MIGRATION do migration_entry_wait 2013-02-23 17:50:23 -08:00
memory_hotplug.c mm/memory_hotplug: use pgdat_end_pfn() instead of open coding the same. 2013-02-23 17:50:21 -08:00
mempolicy.c mm: use NUMA_NO_NODE 2013-02-23 17:50:21 -08:00
mempool.c mempool: add @gfp_mask to mempool_create_node() 2012-06-25 11:53:47 +02:00
migrate.c mm: remove offlining arg to migrate_pages 2013-02-23 17:50:19 -08:00
mincore.c swap: make each swap partition have one address_space 2013-02-23 17:50:17 -08:00
mlock.c mm: use long type for page counts in mm_populate() and get_user_pages() 2013-02-23 17:50:22 -08:00
mm_init.c mm: init: report on last-nid information stored in page->flags 2013-02-23 17:50:18 -08:00
mmap.c mm/rmap: rename anon_vma_unlock() => anon_vma_unlock_write() 2013-02-23 17:50:17 -08:00
mmu_context.c
…
mmu_notifier.c mm: export mmu notifier invalidates 2013-02-23 17:50:23 -08:00
mmzone.c mm: rename page struct field helpers 2013-02-23 17:50:18 -08:00
mprotect.c mm/mprotect.c: coding-style cleanups 2012-12-18 15:02:15 -08:00
mremap.c mm/rmap: rename anon_vma_unlock() => anon_vma_unlock_write() 2013-02-23 17:50:17 -08:00
msync.c
…
nobootmem.c mm: Add alloc_bootmem_low_pages_nopanic() 2013-01-29 19:32:59 -08:00
nommu.c mm: accelerate mm_populate() treatment of THP pages 2013-02-23 17:50:23 -08:00
oom_kill.c memcg, oom: provide more precise dump info while memcg oom happening 2013-02-23 17:50:08 -08:00
page-writeback.c page-writeback.c: subtract min_free_kbytes from dirtyable memory 2013-02-23 17:50:17 -08:00
page_alloc.c mm: accurately document nr_free_*_pages functions with code comments 2013-02-23 17:50:22 -08:00
page_cgroup.c memcontrol: use N_MEMORY instead N_HIGH_MEMORY 2012-12-12 17:38:32 -08:00
page_io.c mm: add support for direct_IO to highmem pages 2012-07-31 18:42:47 -07:00
page_isolation.c mm: fix zone_watermark_ok_safe() accounting of isolated pages 2013-01-04 16:11:46 -08:00
pagewalk.c thp: change split_huge_page_pmd() interface 2012-12-12 17:38:31 -08:00
percpu-km.c
…
percpu-vm.c mm: fix kernel-doc warnings 2012-06-20 14:39:36 -07:00
percpu.c mm, percpu: Make sure percpu_alloc early parameter has an argument 2012-12-02 06:23:04 -08:00
pgtable-generic.c mm: Only flush the TLB when clearing an accessible pte 2012-12-11 14:28:34 +00:00
process_vm_access.c aio/vfs: cleanup of rw_copy_check_uvector() and compat_rw_copy_check_uvector() 2012-05-31 17:49:32 -07:00
quicklist.c
…
readahead.c switch simple cases of fget_light to fdget 2012-09-26 22:20:08 -04:00
rmap.c mm/rmap: rename anon_vma_unlock() => anon_vma_unlock_write() 2013-02-23 17:50:17 -08:00
shmem.c tmpfs: fix mempolicy object leaks 2013-02-23 17:50:23 -08:00
slab.c memcg: add comments clarifying aspects of cache attribute propagation 2012-12-18 15:02:15 -08:00
slab.h slab: propagate tunable values 2012-12-18 15:02:14 -08:00
slab_common.c slab: propagate tunable values 2012-12-18 15:02:14 -08:00
slob.c mm: rename page struct field helpers 2013-02-23 17:50:18 -08:00
slub.c mm: rename page struct field helpers 2013-02-23 17:50:18 -08:00
sparse-vmemmap.c
…
sparse.c memory-failure: use num_poisoned_pages instead of mce_bad_pages 2013-02-23 17:50:15 -08:00
swap.c swap: make each swap partition have one address_space 2013-02-23 17:50:17 -08:00
swap_state.c swap: add per-partition lock for swapfile 2013-02-23 17:50:17 -08:00
swapfile.c swap: add per-partition lock for swapfile 2013-02-23 17:50:17 -08:00
truncate.c mm: drop vmtruncate 2012-12-20 18:46:29 -05:00
util.c swap: make each swap partition have one address_space 2013-02-23 17:50:17 -08:00
vmalloc.c mm: use NUMA_NO_NODE 2013-02-23 17:50:21 -08:00
vmscan.c vmscan: change type of vm_total_pages to unsigned long 2013-02-23 17:50:22 -08:00
vmstat.c mm: add & use zone_end_pfn() and zone_spans_pfn() 2013-02-23 17:50:20 -08:00