On Fri, 2017-11-10 at 10:02 -0600, Christopher Lameter wrote:
> On Fri, 10 Nov 2017, Miles Chen wrote:
>
> > By checking disable_higher_order_debug & (slub_debug &
> > SLAB_NEVER_MERGE), we can detect if a cache is unmergeable but become
> > mergeable because the disable_higher_order_debug=1 logic. Those kind of
> > caches should be keep unmergeable.
>
> Acked-by: Christoph Lameter <cl@xxxxxxxxx>
>
Thanks for the ack, I already sent a v2 patch to fix a build warning in
this patch.(fix a build error: use instead DEBUG_METADATA_FLAGS of
SLAB_NEVER_MERGE)
diff --git a/mm/slub.c b/mm/slub.c
index 1efbb812..8e1c027 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -5704,6 +5704,10 @@ static int sysfs_slab_add(struct kmem_cache *s)
return 0;
}
+ if (!unmergeable && disable_higher_order_debug &&
+ (slub_debug & DEBUG_METADATA_FLAGS))
+ unmergeable = 1;
+
if (unmergeable) {
/*
* Slabcache can never be merged so we can use the name
proper.
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