diff options
| author | Vlastimil Babka | 2017-07-07 00:40:13 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2017-07-07 01:24:34 +0200 |
| commit | e0dd7d53a6d2788f9616e6d7e3e725f8f84e4636 (patch) | |
| tree | fb7a27bf39582c5c95141e3a78409bbe62101f45 /mm/kmemleak.c | |
| parent | mm, cpuset: always use seqlock when changing task's nodemask (diff) | |
| download | kernel-qcow2-linux-e0dd7d53a6d2788f9616e6d7e3e725f8f84e4636.tar.gz kernel-qcow2-linux-e0dd7d53a6d2788f9616e6d7e3e725f8f84e4636.tar.xz kernel-qcow2-linux-e0dd7d53a6d2788f9616e6d7e3e725f8f84e4636.zip | |
mm, mempolicy: don't check cpuset seqlock where it doesn't matter
Two wrappers of __alloc_pages_nodemask() are checking
task->mems_allowed_seq themselves to retry allocation that has raced
with a cpuset update.
This has been shown to be ineffective in preventing premature OOM's
which can happen in __alloc_pages_slowpath() long before it returns back
to the wrappers to detect the race at that level.
Previous patches have made __alloc_pages_slowpath() more robust, so we
can now simply remove the seqlock checking in the wrappers to prevent
further wrong impression that it can actually help.
Link: http://lkml.kernel.org/r/20170517081140.30654-7-vbabka@suse.cz
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Dimitri Sivanich <sivanich@sgi.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/kmemleak.c')
0 files changed, 0 insertions, 0 deletions