Re: [PATCH] mm,ksm: add __GFP_HIGH to the allocation in alloc_stable_node()

[Hugh Dickins <hughd@google.com>]

On Tue, 20 Sep 2016, zhongjiang wrote:

> From: zhong jiang <zhongjiang@huawei.com>
> 
> 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@google.com>
> Signed-off-by: zhong jiang <zhongjiang@huawei.com>

Thanks,
Acked-by: Hugh Dickins <hughd@google.com>

> ---
>  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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