[PATCH v6 0/4] HWPOISON: soft offlining for non-lru movable page

[Yisheng Xie]

Hi Michal, Minchan and all,
Could you please help to review it?

Any suggestion is more than welcome. And Thanks for all of you.

After Minchan's commit bda807d44454 ("mm: migrate: support non-lru movable
page migration"), some type of non-lru page like zsmalloc and
virtio-balloon page also support migration.

Therefore, we can:

1) soft offlining no-lru movable pages, which means when memory
   corrected errors occur on a non-lru movable page, we can stop to use it
   by migrating data onto another page and disable the original (maybe
   half-broken) one.

2) enable memory hotplug for non-lru movable pages, i.e.  we may
   offline blocks, which include such pages, by using non-lru page
   migration.

This patchset is heavily dependent on non-lru movable page migration.
--------
v6:
 * just return -EBUSY for isolate_movable_page when it failed to isolate
   a non-lru movable page, which suggested by Minchan.

v5:
 * change the return type of isolate_movable_page() from bool to int as
   Michal's suggestion.
 * add "enable memory hotplug for non-lru movable pages" to this patchset,
   which also make some change as Michal's suggestion here.

v4:
 * make isolate_movable_page always defined to avoid compile error with
   CONFIG_MIGRATION = n
 * return -EBUSY when isolate_movable_page return false which means failed
   to isolate movable page.

v3:
  * delete some unneed limitation and use !__PageMovable instead of PageLRU
    after isolate page to avoid isolated count mismatch, as Minchan Kim's suggestion.

v2:
 * delete function soft_offline_movable_page() and hanle non-lru movable
   page in __soft_offline_page() as Michal Hocko suggested.

Yisheng Xie (4):
  mm/migration: make isolate_movable_page() return int type
  mm/migration: make isolate_movable_page always defined
  HWPOISON: soft offlining for non-lru movable page
  mm/hotplug: enable memory hotplug for non-lru movable pages

 include/linux/migrate.h |  4 +++-
 mm/compaction.c         |  2 +-
 mm/memory-failure.c     | 26 ++++++++++++++++----------
 mm/memory_hotplug.c     | 28 +++++++++++++++++-----------
 mm/migrate.c            |  6 +++---
 mm/page_alloc.c         |  8 ++++++--
 6 files changed, 46 insertions(+), 28 deletions(-)

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1.7.12.4