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
| ||
|
Date: Thu, 24 Sep 2009 20:38:20 -0400 From: Chris Mason <chris.mason@...cle.com> To: Dave Chinner <david@...morbit.com> Cc: Wu Fengguang <fengguang.wu@...el.com>, Andrew Morton <akpm@...ux-foundation.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, "Li, Shaohua" <shaohua.li@...el.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "richard@....demon.co.uk" <richard@....demon.co.uk>, "jens.axboe@...cle.com" <jens.axboe@...cle.com> Subject: Re: regression in page writeback On Fri, Sep 25, 2009 at 10:11:17AM +1000, Dave Chinner wrote: > On Thu, Sep 24, 2009 at 11:15:08AM +0800, Wu Fengguang wrote: > > On Wed, Sep 23, 2009 at 10:00:58PM +0800, Chris Mason wrote: > > > The only place that actually honors the congestion flag is pdflush. > > > It's trivial to get pdflush backed up and make it sit down without > > > making any progress because once the queue congests, pdflush goes away. > > > > Right. I guess that's more or less intentional - to give lowest priority > > to periodic/background writeback. > > IMO, this is the wrong design. Background writeback should > have higher CPU/scheduler priority than normal tasks. If there is > sufficient dirty pages in the system for background writeback to > be active, it should be running *now* to start as much IO as it can > without being held up by other, lower priority tasks. I'd say that an fsync from mutt or vi should be done at a higher prio than a background streaming writer. -chris -- 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/
Powered by blists - more mailing lists