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

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Message-ID: <20070214145914.GA1566@in.ibm.com>
Date:	Wed, 14 Feb 2007 20:29:14 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	Gautham R Shenoy <ego@...ibm.com>
Cc:	akpm@...l.org, paulmck@...ibm.com, mingo@...e.hu,
	dipankar@...ibm.com, venkatesh.pallipadi@...el.com,
	linux-kernel@...r.kernel.org, oleg@...sign.ru, rjw@...k.pl
Subject: Re: [RFC PATCH(Experimental) 2/4] Revert changes to workqueue.c

On Wed, Feb 14, 2007 at 08:13:05PM +0530, Gautham R Shenoy wrote:
> This patch reverts all the recent workqueue hacks added to make it 
> hotplug safe. 

Oleg,
	This patch probably needs review for any races we may have
missed to account for.  Also we have considered only workqueue.c present
in 2.6.20-rc6-mm3, which means some recent patches in mm tree which are
yet to be published arent accounted for.

Also I expect almost all worker threads to be frozen "for hotplug". The
only exception I have found so far is kthread workqueue, which needs to
remain unfrozen "for cpu hotplug" because kthread_create (in
CPU_UP_PREPARE and stop_machine) relies on its services (while everyone else 
is frozen). 

-- 
Regards,
vatsa
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