[PATCH 0/5] page_owner improvements for debugging

[Vlastimil Babka <vbabka@suse.cz>]

Hi,

I know it's merge window, but this might potentially help us with some
outstanding bugs if page_owner was enabled e.g. for trinity runs, so here
you go.

Patch 1 is a bug fix, patch 2 reduces page_owner overhead when compiled in
but not enabled on boot. Patch 3 is something I suggested before [1] and it
was deemed a good idea, that the page_owner info should follow the page during
migration. Patch 4 allows us again to know that a migration happened and for
which reason.

Patch 5 will hopefully help us when debugging, as it makes all the info be
printed as part of e.g. VM_BUG_ON_PAGE(). Until now it was only accessible via
/sys file.

Patches are based on today's -next. Hugh's migration patches caused conflicts
for patches 3 and 4 when rebasing from 4.3.

[1] https://lkml.org/lkml/2015/7/23/47

Vlastimil Babka (5):
  mm, page_owner: print migratetype of a page, not pageblock
  mm, page_owner: convert page_owner_inited to static key
  mm, page_owner: copy page owner info during migration
  mm, page_owner: track last migrate reason
  mm, page_owner: dump page owner info from dump_page()

 Documentation/vm/page_owner.txt |  9 +++---
 include/linux/page_ext.h        |  1 +
 include/linux/page_owner.h      | 50 ++++++++++++++++++++++++---------
 mm/debug.c                      |  2 ++
 mm/migrate.c                    | 11 ++++++--
 mm/page_owner.c                 | 61 +++++++++++++++++++++++++++++++++++++----
 mm/vmstat.c                     |  2 +-
 7 files changed, 110 insertions(+), 26 deletions(-)

-- 
2.6.2

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