From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Garrett Date: Wed, 18 Nov 2009 19:40:53 +0000 Subject: Re: [PATCH] [RFC] Add support for uevents on block device idle Message-Id: <20091118194053.GB12944@srcf.ucam.org> List-Id: References: <1258468659-5446-1-git-send-email-mjg@redhat.com> <1258474180.16176.62.camel@localhost.localdomain> <20091117185742.GA19829@srcf.ucam.org> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Kay Sievers Cc: David Zeuthen , linux-kernel@vger.kernel.org, axboe@kernel.dk, linux-hotplug@vger.kernel.org On Wed, Nov 18, 2009 at 08:30:07PM +0100, Kay Sievers wrote: > Wouldn't it be good enough, if we add a file "idle_since" which > contains the time of the actual disk idle time, and userspace can > schedule a re-examination of that value at the actual end of the idle > time it is looking for? That would require either polling or waking up a userspace application on every disk access. Doing it in-kernel involves only a single timer wakeup for every active/idle transition. -- Matthew Garrett | mjg59@srcf.ucam.org