On Sat, 23 Jun 2012, Joonsoo Kim wrote: > 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 <[email protected]> > > 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);
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