linux-kernel - Re: [PATCH] cancel_delayed_work: use del_timer() instead of del_timer

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Date:	Wed, 25 Apr 2007 15:02:46 +0200
From:	Jarek Poplawski <jarkao2@...pl>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	David Howells <dhowells@...hat.com>,
	David Miller <davem@...emloft.net>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cancel_delayed_work: use del_timer() instead of del_timer_sync()

On Wed, Apr 25, 2007 at 01:50:34AM +0400, Oleg Nesterov wrote:
> del_timer_sync() buys nothing for cancel_delayed_work(), but it is less
> efficient since it locks the timer unconditionally, and may wait for the
> completion of the delayed_work_timer_fn().

I'm not sure what is the main aim of this patch. It seems this
change cannot do any harm, but anyway it could change a few
things, e.g. with current version of cancel_rearming_delayed_work
some flush_workqueue could be done needlessly, before the work
is queued from timer. It's not a big deal here, but if anybody
did something like this without loop - it could matter.

So, probably a lot of current code should be checked, before
applying and I doubt the gain is worth of this. Maybe, for
safety, make this with new name as an alternative and
deprecate the current version?

Regards,
Jarek P.
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