diff options
| author | Mel Gorman <mgorman@techsingularity.net> | 2016-06-16 09:44:14 +1000 |
|---|---|---|
| committer | Kyle Yan <kyan@codeaurora.org> | 2016-06-24 15:05:16 -0700 |
| commit | 5812a73a1459918f892f96213f44eb083a66b538 (patch) | |
| tree | 715d024d34384369ba206023b91189f5471b6a89 /mm/internal.h | |
| parent | 73fa24503bf34047745bfd0602ec59f3ee2c74db (diff) | |
mm, sl[au]b: add __GFP_ATOMIC to the GFP reclaim mask
Commit d0164adc89f6 ("mm, page_alloc: distinguish between being unable to
sleep, unwilling to sleep and avoiding waking kswapd") modified __GFP_WAIT
to explicitly identify the difference between atomic callers and those
that were unwilling to sleep. Later the definition was removed entirely.
The GFP_RECLAIM_MASK is the set of flags that affect watermark checking
and reclaim behaviour but __GFP_ATOMIC was never added. Without it, atomic
users of the slab allocator strip the __GFP_ATOMIC flag and cannot access
the page allocator atomic reserves. This patch addresses the problem.
The user-visible impact depends on the workload but potentially atomic
allocations unnecessarily fail without this path.
Change-Id: Ieac0932d146f7fd992db9fd834b0e9aa3822f891
Link: http://lkml.kernel.org/r/20160610093832.GK2527@techsingularity.net
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Reported-by: Marcin Wojtas <mw@semihalf.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: <stable@vger.kernel.org> [4.4+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Git-Commit: 843f65ccbb2273430b57ae135ccd26dddee05be7
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
Diffstat (limited to 'mm/internal.h')
| -rw-r--r-- | mm/internal.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/internal.h b/mm/internal.h index 899f7b332a0b..55d4fa99b486 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -22,7 +22,8 @@ */ #define GFP_RECLAIM_MASK (__GFP_RECLAIM|__GFP_HIGH|__GFP_IO|__GFP_FS|\ __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\ - __GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC) + __GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC|\ + __GFP_ATOMIC) /* The GFP flags allowed during early boot */ #define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_RECLAIM|__GFP_IO|__GFP_FS)) |