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authorNick Piggin <npiggin@suse.de>2006-01-18 17:42:27 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-18 19:20:17 -0800
commit053837fce7aa79025ed57656855df09f80175527 (patch)
tree05d7615894131a368fc4943f641b11acdd2ae694 /mm/swap.c
parente236a166b2bc437769a9b8b5d19186a3761bde48 (diff)
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[PATCH] mm: migration page refcounting fix
Migration code currently does not take a reference to target page properly, so between unlocking the pte and trying to take a new reference to the page with isolate_lru_page, anything could happen to it. Fix this by holding the pte lock until we get a chance to elevate the refcount. Other small cleanups while we're here. Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/swap.c')
-rw-r--r--mm/swap.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/mm/swap.c b/mm/swap.c
index cbb48e721ab..bc2442a7b0e 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -174,6 +174,32 @@ void lru_add_drain(void)
put_cpu();
}
+#ifdef CONFIG_NUMA
+static void lru_add_drain_per_cpu(void *dummy)
+{
+ lru_add_drain();
+}
+
+/*
+ * Returns 0 for success
+ */
+int lru_add_drain_all(void)
+{
+ return schedule_on_each_cpu(lru_add_drain_per_cpu, NULL);
+}
+
+#else
+
+/*
+ * Returns 0 for success
+ */
+int lru_add_drain_all(void)
+{
+ lru_add_drain();
+ return 0;
+}
+#endif
+
/*
* This path almost never happens for VM activity - pages are normally
* freed via pagevecs. But it gets used by networking.