linux-kernel - Re: [RFC PATCH 5/6] implement per-cpu&per-domain state machine call

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Date:	Wed, 07 Mar 2012 14:44:07 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Lai Jiangshan <eag0628@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	rostedt@...dmis.org, Valdis.Kletnieks@...edu, dhowells@...hat.com,
	eric.dumazet@...il.com, darren@...art.com, fweisbec@...il.com,
	patches@...aro.org
Subject: Re: [RFC PATCH 5/6] implement per-cpu&per-domain state machine call_srcu()

On 03/06/2012 11:32 PM, Peter Zijlstra wrote:
> On Tue, 2012-03-06 at 22:44 +0800, Lai Jiangshan wrote:
>> it is srcu_barrier(), it have to wait all callbacks complete for all
>> cpus since it is per-cpu
>> implementation.
>>
> If you enqueue each callback as a work, flush_workqueue() alone should
> do that. It'll wait for completion of all currently enqueued works but
> ignores new works.

Callbacks are not queued in the workqueue when call_srcu().
They are delivered(queued in the workqueue) after a grace period,
so we need to wait for all are delivered before flush_workqueue().

> 
> 
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