[PATCH] slab: add additional debugging to detect slabs from the wrong node
This patch adds some stack dumps if the slab logic is processing slab
blocks from the wrong node. This is necessary in order to detect
situations as encountered by Petr.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/mm/slab.c b/mm/slab.c
index d30423f..22bfb0b2 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2419,6 +2419,7 @@
next = slab_bufctl(slabp)[slabp->free];
#if DEBUG
slab_bufctl(slabp)[slabp->free] = BUFCTL_FREE;
+ WARN_ON(numa_node_id() != slabp->nodeid);
#endif
slabp->free = next;
}
@@ -2633,8 +2634,10 @@
check_spinlock_acquired_node(cachep, node);
check_slabp(cachep, slabp);
-
#if DEBUG
+ /* Verify that the slab belongs to the intended node */
+ WARN_ON(slabp->nodeid != node);
+
if (slab_bufctl(slabp)[objnr] != BUFCTL_FREE) {
printk(KERN_ERR "slab: double free detected in cache "
"'%s', objp %p\n", cachep->name, objp);