From: zhong jiang <zhongjiang@xxxxxxxxxx>
Accoding to HUgh's suggestion, alloc_stable_node() with GFP_KERNEL
will cause the hungtask, despite less possiblity.
At present, if alloc_stable_node allocate fails, two break_cow 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 the __GFP_HIGH to GFP. because it grant access to
some of meory reserves. it will make progess to make it allocation
successful at the utmost.
Suggested-by: Hugh Dickins <hughd@xxxxxxxxxx>
Signed-off-by: zhong jiang <zhongjiang@xxxxxxxxxx>
---
mm/ksm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/ksm.c b/mm/ksm.c
index 5048083..42bf16e 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -299,7 +299,7 @@ static inline void free_rmap_item(struct rmap_item *rmap_item)
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)
--
1.8.3.1
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