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authorKonstantin Khlebnikov <khlebnikov@openvz.org>2012-03-21 16:34:06 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-21 17:54:58 -0700
commitf0cb3c76ae1ced85f9034480b1b24cd96530ec78 (patch)
tree997ae67621f76b3b6bf588604f85738a8c97cbef
parent3268c63eded4612a3d07b56d1e02ce7731e6608e (diff)
downloadop-kernel-dev-f0cb3c76ae1ced85f9034480b1b24cd96530ec78.zip
op-kernel-dev-f0cb3c76ae1ced85f9034480b1b24cd96530ec78.tar.gz
mm: drain percpu lru add/rotate page-vectors on cpu hot-unplug
This cpu hotplug hook was accidentally removed in commit 00a62ce91e55 ("mm: fix Committed_AS underflow on large NR_CPUS environment") The visible effect of this accident: some pages are borrowed in per-cpu page-vectors. Truncate can deal with it, but these pages cannot be reused while this cpu is offline. So this is like a temporary memory leak. Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org> Cc: Dave Hansen <dave@linux.vnet.ibm.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Eric B Munson <ebmunson@us.ibm.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/swap.h1
-rw-r--r--mm/page_alloc.c1
-rw-r--r--mm/swap.c4
3 files changed, 4 insertions, 2 deletions
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 64a7dba..b86b5c2 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -223,6 +223,7 @@ extern void lru_add_page_tail(struct zone* zone,
extern void activate_page(struct page *);
extern void mark_page_accessed(struct page *);
extern void lru_add_drain(void);
+extern void lru_add_drain_cpu(int cpu);
extern int lru_add_drain_all(void);
extern void rotate_reclaimable_page(struct page *page);
extern void deactivate_page(struct page *page);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 98552cf..673596a 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4825,6 +4825,7 @@ static int page_alloc_cpu_notify(struct notifier_block *self,
int cpu = (unsigned long)hcpu;
if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) {
+ lru_add_drain_cpu(cpu);
drain_pages(cpu);
/*
diff --git a/mm/swap.c b/mm/swap.c
index 14380e9..5c13f13 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -496,7 +496,7 @@ static void lru_deactivate_fn(struct page *page, void *arg)
* Either "cpu" is the current CPU, and preemption has already been
* disabled; or "cpu" is being hot-unplugged, and is already dead.
*/
-static void drain_cpu_pagevecs(int cpu)
+void lru_add_drain_cpu(int cpu)
{
struct pagevec *pvecs = per_cpu(lru_add_pvecs, cpu);
struct pagevec *pvec;
@@ -553,7 +553,7 @@ void deactivate_page(struct page *page)
void lru_add_drain(void)
{
- drain_cpu_pagevecs(get_cpu());
+ lru_add_drain_cpu(get_cpu());
put_cpu();
}
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