[PATCH 0/5] page_owner improvements for debugging

From: Vlastimil Babka
Date: Wed Nov 04 2015 - 10:02:15 EST


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(-)


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