linux-kernel - Re: [PATCH 2/4] lib/percpu-refcount: introduce percpu_ref

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Message-ID: <20180918125021.GB902964@devbig004.ftw2.facebook.com>
Date:   Tue, 18 Sep 2018 05:50:21 -0700
From:   Tejun Heo <tj@...nel.org>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Jianchao Wang <jianchao.w.wang@...cle.com>,
        Kent Overstreet <kent.overstreet@...il.com>,
        linux-block@...r.kernel.org
Subject: Re: [PATCH 2/4] lib/percpu-refcount: introduce percpu_ref_resurge()

On Tue, Sep 18, 2018 at 06:19:44PM +0800, Ming Lei wrote:
> Now percpu_ref_reinit() can only be done on one percpu refcounter when it
> drops zero. And the limit shouldn't be so strict, and it is quite
> straightforward that we can do it when the refcount doesn't drop zero
> because it is at atomic mode.
> 
> This patch introduces percpu_ref_resurge() in which the above limit is
> relaxed, so we may avoid extra change[1] for NVMe timeout's requirement.

For now,

Nacked-by: Tejun Heo <tj@...nel.org>

Please see the original discussion thread.

Thanks.

-- 
tejun