linux-kernel - Re: [PATCH percpu/for-3.16 2/2] percpu-refcount: implement percpu_ref

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Message-ID: <20140509194140.GC4486@htj.dyndns.org>
Date:	Fri, 9 May 2014 15:41:40 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Kent Overstreet <kmo@...erainc.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH percpu/for-3.16 2/2] percpu-refcount: implement
 percpu_ref_tryget()

On Fri, May 09, 2014 at 12:40:21PM -0700, Kent Overstreet wrote:
> On Wed, May 07, 2014 at 11:58:10AM -0400, Tejun Heo wrote:
> > Implement percpu_ref_tryget() which fails if the refcnt already
> > reached zero.  Note that this is different from the recently renamed
> > percpu_ref_tryget_live() which fails if the refcnt has been killed and
> > is draining the remaining references.  percpu_ref_tryget() succeeds on
> > a killed refcnt as long as its current refcnt is above zero.
> 
> I'd still kind of prefer tryget() to be labelled "deprecated, don't use outside
> the cgroup code" or somesuch, but it's not a huge deal :)

Hmmm... why would it be deprecated?  These are just two different
operations.

Thanks.

-- 
tejun
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