From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757360Ab2CHLzc (ORCPT ); Thu, 8 Mar 2012 06:55:32 -0500 Received: from e28smtp01.in.ibm.com ([122.248.162.1]:47981 "EHLO e28smtp01.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757206Ab2CHLz3 (ORCPT ); Thu, 8 Mar 2012 06:55:29 -0500 Date: Thu, 8 Mar 2012 17:25:06 +0530 From: Srivatsa Vaddagiri To: Peter Zijlstra Cc: Roland Dreier , LKML , Paul Turner , Venkatesh Pallipadi , Suresh Siddha Subject: Re: runnable tasks never making it to a runqueue where they can run? Message-ID: <20120308115506.GA22656@linux.vnet.ibm.com> Reply-To: Srivatsa Vaddagiri References: <1331137905.11248.355.camel@twins> <1331202480.11248.375.camel@twins> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <1331202480.11248.375.camel@twins> User-Agent: Mutt/1.5.21 (2010-09-15) x-cbid: 12030811-4790-0000-0000-000001B1545F Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Peter Zijlstra [2012-03-08 11:28:00]: > select_task_rq_fair() will very likely end up in select_idle_sibling() > which will never select the smt1 if smt0 is idle s/idle/busy? > (even if smt0 isn't in > the cpus allowed mask) -- Vatsa is currently reworking that area, this > is something he might want to consider. The patch I sent couple of days back should likely fix this issue: http://marc.info/?l=linux-kernel&m=133096114129607&w=2 - vatsa