Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752045AbaG3KVm (ORCPT ); Wed, 30 Jul 2014 06:21:42 -0400 Received: from casper.infradead.org ([85.118.1.10]:42115 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751244AbaG3KVl (ORCPT ); Wed, 30 Jul 2014 06:21:41 -0400 Date: Wed, 30 Jul 2014 12:21:28 +0200 From: Peter Zijlstra To: Morten Rasmussen Cc: Yuyang Du , "mingo@redhat.com" , "linux-kernel@vger.kernel.org" , "pjt@google.com" , "bsegall@google.com" , "arjan.van.de.ven@intel.com" , "len.brown@intel.com" , "rafael.j.wysocki@intel.com" , "alan.cox@intel.com" , "mark.gross@intel.com" , "fengguang.wu@intel.com" Subject: Re: [PATCH 0/2 v4] sched: Rewrite per entity runnable load average tracking Message-ID: <20140730102128.GJ19379@twins.programming.kicks-ass.net> References: <1405639567-21445-1-git-send-email-yuyang.du@intel.com> <20140718153931.GJ8700@e103034-lin> <20140727190237.GB22986@intel.com> <20140730101331.GB15761@e103687> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="UxLQriKcE1P0oA6o" Content-Disposition: inline In-Reply-To: <20140730101331.GB15761@e103687> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --UxLQriKcE1P0oA6o Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Wed, Jul 30, 2014 at 11:13:31AM +0100, Morten Rasmussen wrote: > It is a very real problem when user-space uses priorities extensively > like Android does. Tasks related to audio run at very high priorities > but only for a very short amount of time, but due the to priority > scaling their load ends up being several times higher than tasks running > all the time at normal priority. Hence task load is a very poor > indicator of utilization. FWIW Android (which I think does this through binder) is utterly insane in this regard. But yes, we have to live with it. --UxLQriKcE1P0oA6o Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAEBAgAGBQJT2McoAAoJEHZH4aRLwOS6jx4P/RJUphoJfjDy2oJNtTomjvCv O4eLhI6dxff9ybzTjjFBfub/+balwtu6ECY6j8Gw0xXXnwnGr+gLXVQ/OHKROci5 OWAjOPtuYzCfz+UFUrySspWJ0zOaKB5Anfc4SUhLdlxDORJpqd+zOHQjg015TlYA 6ofsF3Td+AJ1Zyzl0IEMFU9cvNLzQVuGqpe2UmZI/eD85PNB03unHSN3frWWc8UJ CisbGcnlg9PH3QQnZLR4hOQGKwDA2AzUQ4S0Ynv7R9nuT73i2OvPSkN/NFllg1fD GeXPxXYIbbFy+yAx3gpK4CY/7eN4Mu8V6943klE+K0ENKAzQH+4YMfxSJO2/0qZ6 9NjIZmNR/PMdHKGE1px2zVdP0uEZnaKyI2zJe8FIPQBxOhoL7a0CHVq3DMFHuTg3 K5Kqy8Z9qWvrveIsk8Kq6gjqQAONlEZMHEaT4i/ECjK9GS0/u8sl5z3D0w3vD6Sf pXTHbYnTBP15M5/F3GEwzuYd3fTyW8VCN/T3svRsL1UrQpnEWCZ3J8kTsCfzQIrL 1jByQXr58RYDPcSOaCNnt86lsLlAfSt3inJZIGL/al41AG14c7lwNTK8bJY5iHj2 fVYNbphLXTGbfq5HtW7Nez07siQmymFuJyotIdkf2JAZQ4MPsveNeRQA6LMNojQL rV7beF7qNRzwoHRFCDWS =EgaO -----END PGP SIGNATURE----- --UxLQriKcE1P0oA6o-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/