linux-kernel - Re: [PATCH 1/2] workqueues: shrink cpu_populated

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Message-ID: <20080218075025.GA3923@ff.dom.local>
Date:	Mon, 18 Feb 2008 07:50:26 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>,
	Jarek Poplawski <jarkao2@...pl>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] workqueues: shrink cpu_populated_map when CPU dies

On Mon, Feb 18, 2008 at 02:45:56AM +0300, Oleg Nesterov wrote:
> On 02/17, Jarek Poplawski wrote:
...
> > 1) ... workqueue_cpu_callback(...)
...
> Yes, but this is harmless. cpu-hotplug callbacks are not time-critical,
> and cpu_down/cpu_up happens not often, and LIST_HEAD(workqueues) is not
> very long, so ...
> 
> > 2) ... __create_workqueue_key(...)
...
> > Shouldn't this list_add() be done after all these inits below?
> This doesn't matter. Please note that get_online_cpus() blocks
> cpu_up/cpu_down, they take cpu_hotplug_begin().

You are completely right. It looks like this was only about ..."look".
(But adding only "default:" in 1) would make it look nicer to me...)

Regards,
Jarek P.
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