From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753959AbbFXR3l (ORCPT ); Wed, 24 Jun 2015 13:29:41 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:60585 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753538AbbFXR3d (ORCPT ); Wed, 24 Jun 2015 13:29:33 -0400 Date: Wed, 24 Jun 2015 19:29:24 +0200 From: Peter Zijlstra To: "Paul E. McKenney" Cc: Oleg Nesterov , tj@kernel.org, mingo@redhat.com, linux-kernel@vger.kernel.org, der.herr@hofr.at, dave@stgolabs.net, riel@redhat.com, viro@ZenIV.linux.org.uk, torvalds@linux-foundation.org Subject: Re: [RFC][PATCH 12/13] stop_machine: Remove lglock Message-ID: <20150624172924.GR3644@twins.programming.kicks-ass.net> References: <20150623182626.GO3892@linux.vnet.ibm.com> <20150624073503.GH3644@twins.programming.kicks-ass.net> <20150624145030.GB3717@linux.vnet.ibm.com> <20150624150151.GN3644@twins.programming.kicks-ass.net> <20150624152705.GE3717@linux.vnet.ibm.com> <20150624154010.GS19282@twins.programming.kicks-ass.net> <20150624160851.GF3717@linux.vnet.ibm.com> <20150624164200.GP3644@twins.programming.kicks-ass.net> <20150624171004.GG3717@linux.vnet.ibm.com> <20150624172005.GA6905@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150624172005.GA6905@linux.vnet.ibm.com> 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 On Wed, Jun 24, 2015 at 10:20:18AM -0700, Paul E. McKenney wrote: > Except that I promised Ingo I would check for CPUs failing to schedule > quickly enough, which means that I must track them individually rather > than via a single counter... You can track individual CPUs timestamps by extending the per-cpu storage we use for the exp_stop_work.