linux-kernel - Re: [RFC PATCH(Experimental) 2/4] Revert changes to workqueue.c

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Message-ID: <20070221155305.GB1596@in.ibm.com>
Date:	Wed, 21 Feb 2007 21:23:05 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Gautham R Shenoy <ego@...ibm.com>, akpm@...l.org,
	paulmck@...ibm.com, mingo@...e.hu, dipankar@...ibm.com,
	venkatesh.pallipadi@...el.com, linux-kernel@...r.kernel.org,
	rjw@...k.pl
Subject: Re: [RFC PATCH(Experimental) 2/4] Revert changes to workqueue.c

On Wed, Feb 21, 2007 at 05:30:10PM +0300, Oleg Nesterov wrote:
> Agreed. Note that we don't need the new "del_work". It is always safe to
> use cancel_work_sync() if we know that the workqueue is frozen, it won't
> block. We can also do
> 
> 	if (!cancel_delayed_work())
> 		cancel_work_sync();
> 
> but it is ok to do cancel_work_sync() unconditionally.

Argh ..I should keep referring to recent sources. I didnt see
cancel_work_sync() in my sources (2.6.20-rc4) and hence invented that 
del_work()! Anyway thanx for pointing out.

This change will probably let us do CPU_DOWN_PREPARE after
freeze_processes(). However I will keep my fingers crossed on whether it
is really a good idea to send CPU_DOWN/UP_PREPARE after
freeze_processes() until we get more review/testing results.

-- 
Regards,
vatsa
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