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-v2.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-v2.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mmksm-add-__gfp_high-to-the-allocation-in-alloc_stable_node-v2.patch
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From: zhongjiang <zhongjiang@xxxxxxxxxx>
Subject: mm,ksm: add __GFP_HIGH to the allocation in alloc_stable_node()
According 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 progress to make it allocation
successful at the utmost.
Link: http://lkml.kernel.org/r/1475070362-44469-1-git-send-email-zhongjiang@xxxxxxxxxx
Acked-by: Hugh Dickins <hughd@xxxxxxxxxx>
Suggested-by: Hugh Dickins <hughd@xxxxxxxxxx>
Signed-off-by: zhong jiang <zhongjiang@xxxxxxxxxx>
---
1 file changed, 8 insertions(+), 1 deletion(-)
index 5048083..5e98c0b 100644
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/ksm.c | 7 +++++++
1 file changed, 7 insertions(+)
diff -puN mm/ksm.c~mmksm-add-__gfp_high-to-the-allocation-in-alloc_stable_node-v2 mm/ksm.c
--- a/mm/ksm.c~mmksm-add-__gfp_high-to-the-allocation-in-alloc_stable_node-v2
+++ a/mm/ksm.c
@@ -299,6 +299,13 @@ static inline void free_rmap_item(struct
static inline struct stable_node *alloc_stable_node(void)
{
+ /*
+ * The caller can take too long time with GFP_KERNEL when memory
+ * is under pressure, it may be lead to the hung task. Therefore,
+ * Adding the __GFP_HIGH to this. it grant access to some of
+ * memory reserves. and it will make progress to make it allocation
+ * successful at the utmost.
+ */
return kmem_cache_alloc(stable_node_cache, GFP_KERNEL | __GFP_HIGH);
}
_
Patches currently in -mm which might be from zhongjiang@xxxxxxxxxx are
mmksm-fix-endless-looping-in-allocating-memory-when-ksm-enable.patch
mmksm-add-__gfp_high-to-the-allocation-in-alloc_stable_node.patch
mmksm-add-__gfp_high-to-the-allocation-in-alloc_stable_node-v2.patch
mm-page_owner-align-with-pageblock_nr-pages.patch
mm-walk-the-zone-in-pageblock_nr_pages-steps.patch
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