Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262302AbVD2QAU (ORCPT ); Fri, 29 Apr 2005 12:00:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262808AbVD2QAT (ORCPT ); Fri, 29 Apr 2005 12:00:19 -0400 Received: from mout.perfora.net ([217.160.230.40]:36594 "EHLO mout.perfora.net") by vger.kernel.org with ESMTP id S262302AbVD2P6A (ORCPT ); Fri, 29 Apr 2005 11:58:00 -0400 Subject: Re: x86-64 bad pmds in 2.6.11.6 II From: Christopher Warner To: Hugh Dickins Cc: cwarner@kernelcode.com, Andi Kleen , Dave Jones , Chris Wright , "Sergey S. Kostyliov" , Clem Taylor , linux-kernel@vger.kernel.org In-Reply-To: References: <20050407062928.GH24469@wotan.suse.de> <20050414170117.GD22573@wotan.suse.de> <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> Content-Type: text/plain Date: Fri, 29 Apr 2005 07:12:59 -0400 Message-Id: <1114773179.9543.14.camel@jasmine> Mime-Version: 1.0 X-Mailer: Evolution 2.2.1.1 Content-Transfer-Encoding: 7bit X-Provags-ID: perfora.net abuse@perfora.net login:d2cbd72fb1ab4860f78cabc62f71ec31 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1245 Lines: 31 > 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. The problem only occurs when doing some thread intensive task. I'm going to try and strace/bt and send some information as it occurs. Hardware is almost identical to the setup above. -Christopher Warner - 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/