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authorDavid Rientjes <rientjes@google.com>2011-03-22 16:30:48 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-22 17:44:01 -0700
commitcbf978bfb12d7deca97d7333f65eda0381a072de (patch)
tree75a415ec997606460c0c851f43e29d008476f231 /mm
parent29423e77c06cee7d4e335ef4a7cbd949da978c91 (diff)
downloadop-kernel-dev-cbf978bfb12d7deca97d7333f65eda0381a072de.zip
op-kernel-dev-cbf978bfb12d7deca97d7333f65eda0381a072de.tar.gz
oom: suppress nodes that are not allowed from meminfo on page alloc failure
Displaying extremely verbose meminfo for all nodes on the system is overkill for page allocation failures when the context restricts that allocation to only a subset of nodes. We don't particularly care about the state of all nodes when some are not allowed in the current context, they can have an abundance of memory but we can't allocate from that part of memory. This patch suppresses disallowed nodes from the meminfo dump on a page allocation failure if the context requires it. Signed-off-by: David Rientjes <rientjes@google.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/page_alloc.c19
1 files changed, 16 insertions, 3 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 2aaafe8..36a168e 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2171,12 +2171,25 @@ rebalance:
nopage:
if (!(gfp_mask & __GFP_NOWARN) && printk_ratelimit()) {
- printk(KERN_WARNING "%s: page allocation failure."
- " order:%d, mode:0x%x\n",
+ unsigned int filter = SHOW_MEM_FILTER_NODES;
+
+ /*
+ * This documents exceptions given to allocations in certain
+ * contexts that are allowed to allocate outside current's set
+ * of allowed nodes.
+ */
+ if (!(gfp_mask & __GFP_NOMEMALLOC))
+ if (test_thread_flag(TIF_MEMDIE) ||
+ (current->flags & (PF_MEMALLOC | PF_EXITING)))
+ filter &= ~SHOW_MEM_FILTER_NODES;
+ if (in_interrupt() || !wait)
+ filter &= ~SHOW_MEM_FILTER_NODES;
+
+ pr_warning("%s: page allocation failure. order:%d, mode:0x%x\n",
current->comm, order, gfp_mask);
dump_stack();
if (!should_suppress_show_mem())
- show_mem();
+ __show_mem(filter);
}
return page;
got_pg:
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