oom-reaper: use madvise_dontneed() logic to decide if unmap the VMA
authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Wed, 22 Feb 2017 23:46:39 +0000 (15:46 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 23 Feb 2017 00:41:30 +0000 (16:41 -0800)
commit235190738aba7c5c94300c8d882842a535280e5a
tree248190ec7e28752ff5971bf9be7dcb9a1b3faefe
parentecf1385d72f0491400a8ceca7001196ca369aa8c
oom-reaper: use madvise_dontneed() logic to decide if unmap the VMA

Logic on whether we can reap pages from the VMA should match what we
have in madvise_dontneed().  In particular, we should skip, VM_PFNMAP
VMAs, but we don't now.

Let's just extract condition on which we can shoot down pagesi from a
VMA with MADV_DONTNEED into separate function and use it in both places.

Link: http://lkml.kernel.org/r/20170118122429.43661-4-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/internal.h
mm/madvise.c
mm/oom_kill.c