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From: Jarek Poplawski <jarkao2@o2.pl>
To: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	David Howells <dhowells@redhat.com>,
	David Miller <davem@davemloft.net>, Ingo Molnar <mingo@elte.hu>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] cancel_delayed_work: use del_timer() instead of del_timer_sync()
Date: Wed, 25 Apr 2007 15:02:46 +0200	[thread overview]
Message-ID: <20070425130246.GA4086@ff.dom.local> (raw)
In-Reply-To: <20070424215034.GA5985@tv-sign.ru>

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.

  parent reply	other threads:[~2007-04-25 12:56 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-04-24 21:50 Oleg Nesterov
2007-04-25 10:04 ` David Howells
2007-04-25 13:02 ` Jarek Poplawski [this message]
2007-04-25 12:52   ` Oleg Nesterov
2007-04-26 14:29     ` Jarek Poplawski
2007-04-26 15:29       ` Oleg Nesterov
2007-04-27  6:15         ` Jarek Poplawski
2007-04-27  7:23           ` Oleg Nesterov

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