From: Yong Wang <yong.y.wang@linux.intel.com>
To: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Cc: "Wu, Xia" <xia.wu@intel.com>, Christoph Hellwig <hch@lst.de>,
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>
Subject: Re: [PATCH] bdi: use deferable timer for sync_supers task
Date: Fri, 8 Oct 2010 18:27:09 +0800 [thread overview]
Message-ID: <20101008102709.GA12682@ywang-moblin2.bj.intel.com> (raw)
In-Reply-To: <1286533687.2095.58.camel@localhost>
On Fri, Oct 08, 2010 at 01:28:07PM +0300, Artem Bityutskiy wrote:
> On Fri, 2010-10-08 at 18:27 +0800, Wu, Xia wrote:
> > > However, when the next wake-up interrupt happens is not defined. It can
> > > happen 1ms after, or 1 minute after, or 1 hour after. What Christoph
> > > says is that there should be some guarantee that sb writeout starts,
> > > say, within 5 to 10 seconds interval. Deferrable timers do not guarantee
> > > this. But take a look at the range hrtimers - they do exactly this.
> >
> > If the system is in sleep state, is there any data which should be written?
>
> May be yes, may be no.
>
Thanks for the quick response, Artem. May I know what might need to be
written out when system is really idle?
-Yong
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next prev parent reply other threads:[~2010-10-08 10:47 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-08 8:35 Yong Wang
2010-10-08 9:25 ` Christoph Hellwig
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 [this message]
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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