linux-kernel - Re: [PATCH 2/3] percpu-refcount: implement percpu_ref_set

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Message-ID: <20140920052638.GA7926@mtj.dyndns.org>
Date:	Sat, 20 Sep 2014 01:26:38 -0400
From:	Tejun Heo <tj@...nel.org>
To:	cl@...ux-foundation.org, kmo@...erainc.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] percpu-refcount: implement percpu_ref_set_killed()

On Mon, Sep 08, 2014 at 11:12:21AM +0900, Tejun Heo wrote:
> With the recent addition of percpu_ref_reinit(), percpu_ref now can be
> used as a persistent switch which can be turned on and off repeatedly
> where turning off maps to killing the ref and waiting for it to drain;
> however, there currently isn't a way to initialize a percpu_ref in its
> off (killed and drained) state, which can be inconvenient for certain
> persistent switch use cases.
> 
> This patch adds percpu_ref_set_killed() which forces the percpu_ref
> into its killed and drained state.  The caller is responsible for
> ensuring that no one else is using the ref.  This can be used to force
> the percpu_ref into its off state after initialization.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Kent Overstreet <kmo@...erainc.com>

This turned out to be too limited.  Dropping this one.

Thanks.

-- 
tejun
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