Merge branch 'akpm' (more incoming from Andrew)

Merge second patch-bomb from Andrew Morton:

 - A little DM fix

 - the MM queue

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (154 commits)
  ksm: allocate roots when needed
  mm: cleanup "swapcache" in do_swap_page
  mm,ksm: swapoff might need to copy
  mm,ksm: FOLL_MIGRATION do migration_entry_wait
  ksm: shrink 32-bit rmap_item back to 32 bytes
  ksm: treat unstable nid like in stable tree
  ksm: add some comments
  tmpfs: fix mempolicy object leaks
  tmpfs: fix use-after-free of mempolicy object
  mm/fadvise.c: drain all pagevecs if POSIX_FADV_DONTNEED fails to discard all pages
  mm: export mmu notifier invalidates
  mm: accelerate mm_populate() treatment of THP pages
  mm: use long type for page counts in mm_populate() and get_user_pages()
  mm: accurately document nr_free_*_pages functions with code comments
  HWPOISON: change order of error_states[]'s elements
  HWPOISON: fix misjudgement of page_action() for errors on mlocked pages
  memcg: stop warning on memcg_propagate_kmem
  net: change type of virtio_chan->p9_max_pages
  vmscan: change type of vm_total_pages to unsigned long
  fs/nfsd: change type of max_delegations, nfsd_drc_max_mem and nfsd_drc_mem_used
  ...

1 files changed, 52 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-kernel-mm-ksm b/Documentation/ABI/testing/sysfs-kernel-mm-ksm
new file mode 100644
index 000000000000..73e653ee2481
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-kernel-mm-ksm
@@ -0,0 +1,52 @@
+What:           /sys/kernel/mm/ksm
+Date:           September 2009
+KernelVersion:  2.6.32
+Contact:        Linux memory management mailing list <linux-mm@kvack.org>
+Description:    Interface for Kernel Samepage Merging (KSM)
+
+What:           /sys/kernel/mm/ksm/full_scans
+What:           /sys/kernel/mm/ksm/pages_shared
+What:           /sys/kernel/mm/ksm/pages_sharing
+What:           /sys/kernel/mm/ksm/pages_to_scan
+What:           /sys/kernel/mm/ksm/pages_unshared
+What:           /sys/kernel/mm/ksm/pages_volatile
+What:           /sys/kernel/mm/ksm/run
+What:           /sys/kernel/mm/ksm/sleep_millisecs
+Date:           September 2009
+Contact:        Linux memory management mailing list <linux-mm@kvack.org>
+Description:    Kernel Samepage Merging daemon sysfs interface
+
+                full_scans: how many times all mergeable areas have been
+                scanned.
+
+                pages_shared: how many shared pages are being used.
+
+                pages_sharing: how many more sites are sharing them i.e. how
+                much saved.
+
+                pages_to_scan: how many present pages to scan before ksmd goes
+                to sleep.
+
+                pages_unshared: how many pages unique but repeatedly checked
+                for merging.
+
+                pages_volatile: how many pages changing too fast to be placed
+                in a tree.
+
+                run: write 0 to disable ksm, read 0 while ksm is disabled.
+                        write 1 to run ksm, read 1 while ksm is running.
+                        write 2 to disable ksm and unmerge all its pages.
+
+                sleep_millisecs: how many milliseconds ksm should sleep between
+                scans.
+
+                See Documentation/vm/ksm.txt for more information.
+
+What:           /sys/kernel/mm/ksm/merge_across_nodes
+Date:           January 2013
+KernelVersion:  3.9
+Contact:        Linux memory management mailing list <linux-mm@kvack.org>
+Description:    Control merging pages across different NUMA nodes.
+
+                When it is set to 0 only pages from the same node are merged,
+                otherwise pages from all nodes can be merged together (default).