lkml.org 
[lkml]   [2007]   [Apr]   [12]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
FromNeil Brown <>
DateThu, 12 Apr 2007 17:27:33 +1000
SubjectSLUB: kmem_cache_destroy doesn't
I tried out SLOB in latest mm.
raid5 uses kmem_cache_create to create a cache, a deletes it with
kmem_cache_destroy.

After I change the name for the slab to not include a '/' the create
worked fine, but the destroy seems incomplete.
If I stop an array and restart it, the second kmem_cache_create fails
because it thinks the name is already in use.

If I look in sysfs, I can see it there.
And 

  # cat /sys/slab/raid5-md1/aliases
  -1

is a bit suspicious.

And

void kmem_cache_destroy(struct kmem_cache *s)
{
	down_write(&slub_lock);
	if (s->refcount)
		s->refcount--;
	else {
		list_del(&s->list);
		WARN_ON(kmem_cache_close(s));
		sysfs_slab_remove(s);
		kfree(s);
	}
	up_write(&slub_lock);
}
looks a bit odd.
I would have thought the test should be:

        if (s->refcount > 1)
??

(2.6.21-rc6-mm1 to be precise)

NeilBrown
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-04-12 07:31    [from the cache]
©2003-2008