Commit 74ee4ef1 authored Jan 09, 2012 by David Rientjes Committed by Pekka Enberg Jan 10, 2012

slub: disallow changing cpu_partial from userspace for debug caches



For caches with debugging enabled, "slub: Switch per cpu partial page
support off for debugging" changes cpu_partial to 0.  It shouldn't be
tunable from userspace for such caches, otherwise the same accounting
issues arise during validation.

This patch disallows tuning /sys/kernel/slab/cache/cpu_partial to be non-
zero for caches with debugging enabled.

Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

parent 213eeb9f

mm/slub.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -4649,6 +4649,8 @@ static ssize_t cpu_partial_store(struct kmem_cache s, const char buf,
		err = strict_strtoul(buf, 10, &objects);
		if (err)
		return err;
		if (objects && kmem_cache_debug(s))
		return -EINVAL;

		s->cpu_partial = objects;
		flush_all(s);

Admin message