Messages in this thread | | | Date | Wed, 4 Oct 2017 03:24:13 +0800 | From | Ming Lei <> | Subject | Re: [PATCH V8 5/8] percpu-refcount: introduce __percpu_ref_tryget_live |
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On Tue, Oct 03, 2017 at 06:40:24PM +0000, Bart Van Assche wrote: > On Tue, 2017-10-03 at 22:04 +0800, Ming Lei wrote: > > Block layer need to call this function after holding > > rcu lock in a real hot path, so introduce this helper. > > Since it is allowed to nest rcu_read_lock_sched() calls I don't think > that this patch is necessary.
Yeah, I know that, with this patch, we can avoid the nest RCU lock. As I mentioned, it is a real hot path, so maybe better to not introduce the extra RCU read lock/unlock.
If you guys doesn't care the little cost, I can remove that.
-- Ming
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