linux-kernel - Re: [PATCH] flush_cpu_workqueue: don't flush an empty ->worklist

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Message-ID: <20070115043304.GA16435@in.ibm.com>
Date:	Mon, 15 Jan 2007 10:03:04 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...l.org>, David Howells <dhowells@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...l.org>,
	linux-kernel@...r.kernel.org, Gautham shenoy <ego@...ibm.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Subject: Re: [PATCH] flush_cpu_workqueue: don't flush an empty ->worklist

On Mon, Jan 15, 2007 at 02:54:10AM +0300, Oleg Nesterov wrote:
> How about the pseudo-code below?

Some quick comments:

- singlethread_cpu needs to be hotplug safe (broken currently)

- Any reason why cpu_populated_map is not modified on CPU_DEAD?

- I feel more comfortable if workqueue_cpu_callback were to take
  workqueue_mutex in LOCK_ACQ and release it in LOCK_RELEASE 
  notifications. This will provide stable access to cpu_populated_map
  to functions like __create_workqueue.

Finally, I wonder if these changes will be unnecessary if we move to
process freezer based hotplug locking ...

-- 
Regards,
vatsa
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