Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262851AbVD2RdU (ORCPT ); Fri, 29 Apr 2005 13:33:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262852AbVD2RdU (ORCPT ); Fri, 29 Apr 2005 13:33:20 -0400 Received: from firewall.kernelslacker.org ([68.162.252.20]:17864 "EHLO nwo.kernelslacker.org") by vger.kernel.org with ESMTP id S262851AbVD2RdQ (ORCPT ); Fri, 29 Apr 2005 13:33:16 -0400 Date: Fri, 29 Apr 2005 13:32:16 -0400 From: Dave Jones To: Christopher Warner Cc: Hugh Dickins , cwarner@kernelcode.com, Andi Kleen , Chris Wright , "Sergey S. Kostyliov" , Clem Taylor , linux-kernel@vger.kernel.org Subject: Re: x86-64 bad pmds in 2.6.11.6 II Message-ID: <20050429173216.GB1832@redhat.com> Mail-Followup-To: Dave Jones , Christopher Warner , Hugh Dickins , cwarner@kernelcode.com, Andi Kleen , Chris Wright , "Sergey S. Kostyliov" , Clem Taylor , linux-kernel@vger.kernel.org References: <20050414181015.GH22573@wotan.suse.de> <20050414181133.GA18221@wotan.suse.de> <20050414182712.GG493@shell0.pdx.osdl.net> <20050415172408.GB8511@wotan.suse.de> <20050415172816.GU493@shell0.pdx.osdl.net> <20050419133509.GF7715@wotan.suse.de> <1114773179.9543.14.camel@jasmine> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1114773179.9543.14.camel@jasmine> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1261 Lines: 30 On Fri, Apr 29, 2005 at 07:12:59AM -0400, Christopher Warner wrote: > > > It does. Well, I needed to restudy exec_mmap and switch_mm in detail, > > and having done so, I agree that the only way you can get through > > exec_mmap's activate_mm without fully flushing the cpu's TLB, is if > > the active_mm matches the newly allocated mm (itself impossible since > > there's a reference on the active_mm), and the cpu bit is still set > > in cpu_vm_mask - precisely not the case if we went through leave_mm. > > Yet I was claiming your leave_mm fix could flush TLB for exec_mmap > > where it wasn't already done. > > > > Sorry for letting the neatness of my pmd/stack story blind me > > to its impossibility, and for wasting your time. > > > > Hugh > > - > > Any updated information one should know about this before testing? > > I'm getting bad pmds in 2.6.11.5; Tyan S2882/dual AMD 246 opterons. Datapoint: exactly the same model as my workstation which showed this problem recently. Dave - 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/