From: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
To: ext Christoph Hellwig <hch@lst.de>
Cc: Yong Wang <yong.y.wang@linux.intel.com>,
Jens Axboe <jaxboe@fusionio.com>,
Wu Fengguang <fengguang.wu@intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"xia.wu@intel.com" <xia.wu@intel.com>
Subject: Re: [PATCH] bdi: use deferable timer for sync_supers task
Date: Fri, 08 Oct 2010 13:02:35 +0300 [thread overview]
Message-ID: <1286532155.2095.52.camel@localhost> (raw)
In-Reply-To: <20101008092520.GB5426@lst.de>
On Fri, 2010-10-08 at 11:25 +0200, ext Christoph Hellwig wrote:
> 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.
Infinitely.
There are range hrtimers which can do exactly what you said - you
specify the hard and soft limits there.
--
Best Regards,
Artem Bityutskiy (D?N?N?N?D 1/4 D?D,N?N?N?DoD,D1)
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2010-10-08 10:05 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
2010-10-08 10:02 ` Artem Bityutskiy [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1286532155.2095.52.camel@localhost \
--to=artem.bityutskiy@nokia.com \
--cc=fengguang.wu@intel.com \
--cc=hch@lst.de \
--cc=jaxboe@fusionio.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=xia.wu@intel.com \
--cc=yong.y.wang@linux.intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).