tree 73bed79bf4da794881cb5b9da99a017bdc2f3a99
parent 002f290627c27068087f6204baec7a334e5a3b48
author Mel Gorman <mgorman@techsingularity.net> 1463703272 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1463710334 -0700

mm, page_alloc: defer debugging checks of freed pages until a PCP drain

Every page free checks a number of page fields for validity.  This
catches premature frees and corruptions but it is also expensive.  This
patch weakens the debugging check by checking PCP pages at the time they
are drained from the PCP list.  This will trigger the bug but the site
that freed the corrupt page will be lost.  To get the full context, a
kernel rebuild with DEBUG_VM is necessary.

[akpm@linux-foundation.org: fix build]
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>