From: Christoph Hellwig <hch@lst.de>
To: Yong Wang <yong.y.wang@linux.intel.com>
Cc: Jens Axboe <jaxboe@fusionio.com>, Christoph Hellwig <hch@lst.de>,
Artem Bityutskiy <Artem.Bityutskiy@nokia.com>,
Wu Fengguang <fengguang.wu@intel.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
xia.wu@intel.com
Subject: Re: [PATCH] bdi: use deferable timer for sync_supers task
Date: Fri, 8 Oct 2010 11:25:20 +0200 [thread overview]
Message-ID: <20101008092520.GB5426@lst.de> (raw)
In-Reply-To: <20101008083514.GA12402@ywang-moblin2.bj.intel.com>
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.
next prev parent reply other threads:[~2010-10-08 9:25 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-08 8:35 [PATCH] bdi: use deferable timer for sync_supers task Yong Wang
2010-10-08 9:25 ` Christoph Hellwig [this message]
2010-10-08 10:02 ` Artem Bityutskiy
2010-10-08 10:04 ` Wu, Xia
2010-10-08 10:09 ` Artem Bityutskiy
2010-10-08 10:27 ` Wu, Xia
2010-10-08 10:28 ` Artem Bityutskiy
2010-10-08 10:27 ` Yong Wang
2010-10-08 13:57 ` Wu Fengguang
2010-10-08 14:42 ` Wu Fengguang
2010-10-08 13:59 ` Artem Bityutskiy
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