Messages in this thread | | | Date | Wed, 22 Mar 2017 11:00:29 -0400 | From | Tejun Heo <> | Subject | Re: [PATCH] percpu-refcount: support synchronous switch to atomic mode. |
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On Wed, Mar 22, 2017 at 12:50:12PM +1100, NeilBrown wrote: > > percpu_ref_switch_to_atomic_sync() schedules the switch > to atomic mode, then waits for it to complete. > > Also export percpu_ref_switch_to_* so they can be used from modules. > > This will be used in md/raid to count the number of pending write > requests to an array. > We occasionally need to check if the count is zero, but most often > we don't care. > We always want updates to the counter to be fast, as in some cases > we count every 4K page. > > Signed-off-by: NeilBrown <neilb@suse.com>
Acked-by: Tejun Heo <tj@kernel.org>
Please feel free to route through other patches through md tree. If preferable, I can route it through percpu/for-4.12.
Thanks.
-- tejun
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