Messages in this thread Patch in this message | | | From | Joonsoo Kim <> | Subject | [PATCH 2/3] slub: reduce failure of this_cpu_cmpxchg in put_cpu_partial() after unfreezing | Date | Sat, 23 Jun 2012 03:22:38 +0900 |
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In current implementation, after unfreezing, we doesn't touch oldpage, so it remain 'NOT NULL'. When we call this_cpu_cmpxchg() with this old oldpage, this_cpu_cmpxchg() is mostly be failed.
We can change value of oldpage to NULL after unfreezing, because unfreeze_partial() ensure that all the cpu partial slabs is removed from cpu partial list. In this time, we could expect that this_cpu_cmpxchg is mostly succeed.
Signed-off-by: Joonsoo Kim <js1304@gmail.com>
diff --git a/mm/slub.c b/mm/slub.c index 92f1c0e..531d8ed 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1968,6 +1968,7 @@ int put_cpu_partial(struct kmem_cache *s, struct page *page, int drain) local_irq_save(flags); unfreeze_partials(s); local_irq_restore(flags); + oldpage = NULL; pobjects = 0; pages = 0; stat(s, CPU_PARTIAL_DRAIN); -- 1.7.9.5
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