linux-kernel - Re: [PATCH] bdi: use deferable timer for sync

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Message-ID: <20101008092520.GB5426@lst.de>
Date:	Fri, 8 Oct 2010 11:25:20 +0200
From:	Christoph Hellwig <hch@....de>
To:	Yong Wang <yong.y.wang@...ux.intel.com>
Cc:	Jens Axboe <jaxboe@...ionio.com>, Christoph Hellwig <hch@....de>,
	Artem Bityutskiy <Artem.Bityutskiy@...ia.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, xia.wu@...el.com
Subject: Re: [PATCH] bdi: use deferable timer for sync_supers task

On Fri, Oct 08, 2010 at 04:35:14PM +0800, Yong Wang wrote:
> sync_supers task currently wakes up periodically for superblock
> writeback. This hurts power on battery driven devices. This patch
> turns this housekeeping timer into a deferable timer so that it
> does not fire when system is really idle.

How long can the timer be defereed?  We can't simply stop writing
out data for a long time.  I think the current timer value should be
the upper bound, but allowing to fire earlier to run during the
same wakeup cycle as others is fine.

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