Messages in this thread | | | Date | Tue, 11 Sep 2018 06:44:04 -0700 | From | Tejun Heo <> | Subject | Re: [PATCH] percpu-refcount: relax limit on percpu_ref_reinit() |
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Hello,
On Tue, Sep 11, 2018 at 12:40:36PM +0800, jianchao.wang wrote: > (long)(sum (every cpu's refcounter)) + atomic refcounter > > and when switch to atomic mode, there could be value left in atomic refcounter. > then the unsigned long percpu refcounter cound be decreased from 0.
It can always do that. Imagine a task getting a ref on one cpu, migrating and putting it on another. The only thing which matters is that the sum of everything adds upto what it should be.
Thanks.
-- tejun
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