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From: Tejun Heo <tj@kernel.org>
To: NeilBrown <neilb@suse.com>
Cc: Christoph Lameter <cl@linux.com>,
	linux-kernel@vger.kernel.org, Shaohua Li <shli@kernel.org>,
	Linux-RAID <linux-raid@vger.kernel.org>
Subject: Re: [PATCH] percpu-refcount: support synchronous switch to atomic mode.
Date: Wed, 22 Mar 2017 11:00:29 -0400	[thread overview]
Message-ID: <20170322150029.GA7532@htj.duckdns.org> (raw)
In-Reply-To: <87o9wuaxm3.fsf@notabene.neil.brown.name>

On Wed, Mar 22, 2017 at 12:50:12PM +1100, NeilBrown wrote:
> 
> percpu_ref_switch_to_atomic_sync() schedules the switch
> to atomic mode, then waits for it to complete.
> 
> Also export percpu_ref_switch_to_* so they can be used from modules.
> 
> This will be used in md/raid to count the number of pending write
> requests to an array.
> We occasionally need to check if the count is zero, but most often
> we don't care.
> We always want updates to the counter to be fast, as in some cases
> we count every 4K page.
> 
> Signed-off-by: NeilBrown <neilb@suse.com>

Acked-by: Tejun Heo <tj@kernel.org>

Please feel free to route through other patches through md tree.  If
preferable, I can route it through percpu/for-4.12.

Thanks.

-- 
tejun

  reply	other threads:[~2017-03-22 15:00 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-22  1:50 NeilBrown
2017-03-22 15:00 ` Tejun Heo [this message]
2017-03-23  2:20   ` Shaohua Li

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