The patch titled
Subject: mm, page_alloc: warn about empty nodemask
has been added to the -mm tree. Its filename is
mm-page_alloc-warn-about-empty-nodemask.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-page_alloc-warn-about-empty-nodemask.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-page_alloc-warn-about-empty-nodemask.patch
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------------------------------------------------------
From: Li Zhong <zhong@xxxxxxxxxxxxxxxxxx>
Subject: mm, page_alloc: warn about empty nodemask
Warn about allocating with an empty nodemask, it would be easier to
understand than oom messages. The check is added in the slow path.
Link: http://lkml.kernel.org/r/1473208886.12692.2.camel@TP420
Signed-off-by: Li Zhong <zhong@xxxxxxxxxxxxxxxxxx>
Suggested-by: Vlastimil Babka <vbabka@xxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: John Allen <jallen@xxxxxxxxxxxxxxxxxx>
Cc: Xishi Qiu <qiuxishi@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: n-horiguchi@xxxxxxxxxxxxx said:
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 6 ++++++
1 file changed, 6 insertions(+)
diff -puN mm/page_alloc.c~mm-page_alloc-warn-about-empty-nodemask mm/page_alloc.c
--- a/mm/page_alloc.c~mm-page_alloc-warn-about-empty-nodemask
+++ a/mm/page_alloc.c
@@ -3521,6 +3521,12 @@ __alloc_pages_slowpath(gfp_t gfp_mask, u
if (page)
goto got_pg;
+ if (ac->nodemask && nodes_empty(*ac->nodemask)) {
+ pr_warn("nodemask is empty\n");
+ gfp_mask &= ~__GFP_NOWARN;
+ goto nopage;
+ }
+
/*
* For costly allocations, try direct compaction first, as it's likely
* that we have enough base pages and don't need to reclaim. Don't try
_
Patches currently in -mm which might be from zhong@xxxxxxxxxxxxxxxxxx are
mm-page_alloc-warn-about-empty-nodemask.patch
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