From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Garrett Subject: Re: [PATCH, v10 3/3] cgroups: introduce timer slack controller Date: Mon, 17 Oct 2011 16:19:20 +0100 Message-ID: <20111017151920.GA16664@srcf.ucam.org> References: <1318837019.6594.29.camel@twins> <20111017124647.GA12838@srcf.ucam.org> <1318856786.4172.22.camel@twins> <20111017141147.GA14581@srcf.ucam.org> <1318861707.4172.32.camel@twins> <20111017144013.GA15447@srcf.ucam.org> <1318862969.4172.45.camel@twins> <20111017145952.GB15769@srcf.ucam.org> <1318864260.4172.54.camel@twins> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1318864260.4172.54.camel@twins> Sender: linux-api-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Peter Zijlstra Cc: Thomas Gleixner , Arjan van de Ven , Lennart Poettering , Andrew Morton , "Kirill A. Shutemov" , Paul Menage , Li Zefan , containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, jacob.jun.pan-VuQAYsv1563Yd54FQh9/CA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Matt Helsley , linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Kay Sievers , harald-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, david-o55+BOBDEFg@public.gmane.org, greg-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org List-Id: linux-api@vger.kernel.org On Mon, Oct 17, 2011 at 05:11:00PM +0200, Peter Zijlstra wrote: > On Mon, 2011-10-17 at 15:59 +0100, Matthew Garrett wrote: > > I'm not saying that it's a problem. I'm saying that your approach > > changes behavioural semantics in a way that may violate application > > expectations just as surely as changing the timer behaviour does. > > There's no free approach. > > I'm not saying its free, I'm saying its a much better approach since it > gets rid of the entire problem instead of papering over the worst of it. It solves it for a specific case, ie animations. Any other timer driven behaviour continues. It really does need to be tied to session idle, not application visibility, and enforcement at the X level does nothing to help that. -- Matthew Garrett | mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org