This is a note to let you know that I've just added the patch titled
mm, sl[au]b: add __GFP_ATOMIC to the GFP reclaim mask
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-slb-add-__gfp_atomic-to-the-gfp-reclaim-mask.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e838a45f9392a5bd2be1cd3ab0b16ae85857461c Mon Sep 17 00:00:00 2001
From: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Date: Fri, 24 Jun 2016 14:49:37 -0700
Subject: mm, sl[au]b: add __GFP_ATOMIC to the GFP reclaim mask
From: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
commit e838a45f9392a5bd2be1cd3ab0b16ae85857461c upstream.
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.
Link: http://lkml.kernel.org/r/20160610093832.GK2527@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Reported-by: Marcin Wojtas <mw@xxxxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/internal.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- 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))
Patches currently in stable-queue which might be from mgorman@xxxxxxxxxxxxxxxxxxx are
queue-4.4/mm-compaction-abort-free-scanner-if-split-fails.patch
queue-4.4/mm-compaction-prevent-vm_bug_on-when-terminating-freeing-scanner.patch
queue-4.4/mm-meminit-always-return-a-valid-node-from-early_pfn_to_nid.patch
queue-4.4/mm-meminit-ensure-node-is-online-before-checking-whether-pages-are-uninitialised.patch
queue-4.4/mm-slb-add-__gfp_atomic-to-the-gfp-reclaim-mask.patch
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