Messages in this thread | | | Date | Tue, 17 Jan 2017 09:02:15 -0800 | From | Tejun Heo <> | Subject | Re: [PATCH 2/9] slab: remove synchronous rcu_barrier() call in memcg cache release path |
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On Tue, Jan 17, 2017 at 08:37:45AM -0800, Tejun Heo wrote: > The call sequence doesn't matter. Whether you're using call_rcu() or > rcu_barrier(), you're just waiting for a grace period to pass before > continuing. It doens't give any other ordering guarantees, so the new > code should be equivalent to the old one except for being asynchronous.
Oh I was confusing synchronize_rcu() with rcu_barrier(), so you're right, kmem_cache struct needs to stay around for the slab pages to be freed after RCU grace period. Will revise the patch accordingly, thanks.
Thanks.
-- tejun
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