linux-kernel - Re: [PATCHSET percpu/for-3.17] percpu: implement percpu_ref

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Message-ID: <20140628121059.GC10829@htj.dyndns.org>
Date:	Sat, 28 Jun 2014 08:10:59 -0400
From:	Tejun Heo <tj@...nel.org>
To:	cl@...ux-foundation.org, kmo@...erainc.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCHSET percpu/for-3.17] percpu: implement percpu_ref_reinit()

On Tue, Jun 17, 2014 at 09:07:59PM -0400, Tejun Heo wrote:
> Hello,
> 
> Currently, percpu_ref destruction - freeing the percpu counter -
> happens when the percpu_ref is released.  This while a bit more
> convenient restricts how percpu_ref can be used.  It can't be
> initialized with static percpu area and it can't be reinitialized
> without going through percpu allocation.
> 
> There are use cases which can take advantage of cycling percpu_ref
> through init/release multiple times.  This patchset separates out
> percpu_ref destruction into percpu_exit() which should be invoked
> explicitly and introduces percpu_ref_reinit() which can be used to
> recycle a released percpu_ref.
> 
> This patchset doesn't add any users.  Patchset to use this will soon
> be posted.
> 
> This patchset contains the following six patches.
> 
>  0001-percpu-refcount-aio-use-percpu_ref_cancel_init-in-io.patch
>  0002-percpu-refcount-one-bit-is-enough-for-REF_STATUS.patch
>  0003-percpu-refcount-add-helpers-for-percpu_count-accesse.patch
>  0004-percpu-refcount-use-unsigned-long-for-pcpu_count-poi.patch
>  0005-percpu-refcount-require-percpu_ref-to-be-exited-expl.patch
>  0006-percpu-refcount-implement-percpu_ref_reinit-and-perc.patch

Applied to percpu/for-3.17.

Thanks.

-- 
tejun
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