Messages in this thread | | | Subject | Re: [PATCH] percpu-refcount: relax limit on percpu_ref_reinit() | From | "jianchao.wang" <> | Date | Tue, 11 Sep 2018 22:13:23 +0800 |
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Hi tejun
On 09/11/2018 09:44 PM, Tejun Heo wrote: > 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 for your kindly response. I have got the point here.
Thanks Jianchao
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