+ mmksm-add-__gfp_high-to-the-allocation-in-alloc_stable_node.patch added to -mm tree

+ mmksm-add-__gfp_high-to-the-allocation-in-alloc_stable_node.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm,ksm: add __GFP_HIGH to the allocation in alloc_stable_node()
has been added to the -mm tree.  Its filename is
     mmksm-add-__gfp_high-to-the-allocation-in-alloc_stable_node.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mmksm-add-__gfp_high-to-the-allocation-in-alloc_stable_node.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mmksm-add-__gfp_high-to-the-allocation-in-alloc_stable_node.patch

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------------------------------------------------------
From: zhong jiang <zhongjiang@huawei.com>
Subject: mm,ksm: add __GFP_HIGH to the allocation in alloc_stable_node()

According to Hugh's suggestion, alloc_stable_node() with GFP_KERNEL can in
rare cases cause a hung task warning.

At present, if alloc_stable_node() allocation fails, two break_cows may
want to allocate a couple of pages, and the issue will come up when free
memory is under pressure.

We fix it by adding __GFP_HIGH to GFP, to grant access to memory reserves,
increasing the likelihood of allocation success.

Suggested-by: Hugh Dickins <hughd@google.com>
Link: http://lkml.kernel.org/r/1474354484-58233-1-git-send-email-zhongjiang@huawei.com
Signed-off-by: zhong jiang <zhongjiang@huawei.com>
Acked-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/ksm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN mm/ksm.c~mmksm-add-__gfp_high-to-the-allocation-in-alloc_stable_node mm/ksm.c
--- a/mm/ksm.c~mmksm-add-__gfp_high-to-the-allocation-in-alloc_stable_node
+++ a/mm/ksm.c
@@ -299,7 +299,7 @@ static inline void free_rmap_item(struct
 
 static inline struct stable_node *alloc_stable_node(void)
 {
-	return kmem_cache_alloc(stable_node_cache, GFP_KERNEL);
+	return kmem_cache_alloc(stable_node_cache, GFP_KERNEL | __GFP_HIGH);
 }
 
 static inline void free_stable_node(struct stable_node *stable_node)
_

Patches currently in -mm which might be from zhongjiang@huawei.com are

mmksm-fix-endless-looping-in-allocating-memory-when-ksm-enable.patch
mmksm-add-__gfp_high-to-the-allocation-in-alloc_stable_node.patch
mm-page_owner-align-with-pageblock_nr-pages.patch
mm-walk-the-zone-in-pageblock_nr_pages-steps.patch