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[PATCH] slab: add additional debugging to detect slabs from the wrong node

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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>
This commit is contained in:
Christoph Lameter 2005-10-29 18:15:52 -07:00 committed by Linus Torvalds
parent c340010e4b
commit 09ad4bbc3a
1 changed files with 4 additions and 1 deletions
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5
mm/slab.c
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@ -2419,6 +2419,7 @@ static void *cache_alloc_refill(kmem_cache_t *cachep, gfp_t flags)
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 @@ static void free_block(kmem_cache_t *cachep, void **objpp, int nr_objects, int n
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);