From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jens Axboe Subject: Re: [PATCH 6/9] writeback: allow sleepy exit of default writeback task Date: Thu, 6 Aug 2009 09:03:26 +0200 Message-ID: <20090806070326.GG12579@kernel.dk> References: <1248989044-21605-1-git-send-email-jens.axboe@oracle.com> <1248989044-21605-7-git-send-email-jens.axboe@oracle.com> <20090805195757.GE27505@duck.suse.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, chris.mason@oracle.com, david@fromorbit.com, hch@infradead.org, akpm@linux-foundation.org, yanmin_zhang@linux.intel.com, richard@rsk.demon.co.uk, damien.wyart@free.fr, fweisbec@gmail.com, Alan.Brunelle@hp.com To: Jan Kara Return-path: Received: from brick.kernel.dk ([93.163.65.50]:49153 "EHLO kernel.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751880AbZHFHD0 (ORCPT ); Thu, 6 Aug 2009 03:03:26 -0400 Content-Disposition: inline In-Reply-To: <20090805195757.GE27505@duck.suse.cz> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: On Wed, Aug 05 2009, Jan Kara wrote: > On Thu 30-07-09 23:24:01, Jens Axboe wrote: > > Since we do lazy create of default writeback tasks for a bdi, we can > > allow sleepy exit if it has been completely idle for 5 minutes. > Maybe there should be a sysfs tunable to this? Not sure, and when in doubt I prefer not to do that. But we could easily add one, if people think it will be useful. What would the reason for turning it off be? -- Jens Axboe