linux-kernel - Re: [PATCH cgroup/for-3.16] cgroup: rename css_tryget*() to css_tryget

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Message-ID: <20140508183622.GR19914@cmpxchg.org>
Date:	Thu, 8 May 2014 14:36:22 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	Li Zefan <lizefan@...wei.com>, Vivek Goyal <vgoyal@...hat.com>,
	Jens Axboe <axboe@...nel.dk>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Michal Hocko <mhocko@...e.cz>, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH cgroup/for-3.16] cgroup: rename css_tryget*() to
 css_tryget_online*()

On Wed, May 07, 2014 at 12:04:29PM -0400, Tejun Heo wrote:
> Unlike the more usual refcnting, what css_tryget() provides is the
> distinction between online and offline csses instead of protection
> against upping a refcnt which already reached zero.  cgroup is
> planning to provide actual tryget which fails if the refcnt already
> reached zero.  Let's rename the existing trygets so that they clearly
> indicate that they're onliness.
> 
> I thought about keeping the existing names as-are and introducing new
> names for the planned actual tryget; however, given that each
> controller participates in the synchronization of the online state, it
> seems worthwhile to make it explicit that these functions are about
> on/offline state.
> 
> Rename css_tryget() to css_tryget_online() and css_tryget_from_dir()
> to css_tryget_online_from_dir().  This is pure rename.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Vivek Goyal <vgoyal@...hat.com>
> Cc: Jens Axboe <axboe@...nel.dk>
> Cc: Li Zefan <lizefan@...wei.com>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Michal Hocko <mhocko@...e.cz>

Acked-by: Johannes Weiner <hannes@...xchg.org>
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