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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20101008102709.GA12682@ywang-moblin2.bj.intel.com>
Date:	Fri, 8 Oct 2010 18:27:09 +0800
From:	Yong Wang <yong.y.wang@...ux.intel.com>
To:	Artem Bityutskiy <Artem.Bityutskiy@...ia.com>
Cc:	"Wu, Xia" <xia.wu@...el.com>, Christoph Hellwig <hch@....de>,
	Jens Axboe <jaxboe@...ionio.com>,
	"Wu, Fengguang" <fengguang.wu@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH] bdi: use deferable timer for sync_supers task

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/