Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932406AbcCHPV2 (ORCPT ); Tue, 8 Mar 2016 10:21:28 -0500 Received: from g4t3428.houston.hp.com ([15.201.208.56]:43835 "EHLO g4t3428.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753679AbcCHPVL (ORCPT ); Tue, 8 Mar 2016 10:21:11 -0500 Message-ID: <1457453628.15454.442.camel@hpe.com> Subject: Re: runtime regression with "x86/mm/pat: Emulate PAT when it is disabled" From: Toshi Kani To: Paul Gortmaker Cc: Borislav Petkov , Richard Purdie , Toshi Kani , Bruce Ashfield , "Hart, Darren" , "saul.wold" , linux-kernel@vger.kernel.org Date: Tue, 08 Mar 2016 09:13:48 -0700 In-Reply-To: <20160308031653.GE26051@windriver.com> References: <20160303205924.GA25222@windriver.com> <1457067768.15454.181.camel@hpe.com> <20160304183713.GA26051@windriver.com> <1457129560.15454.266.camel@hpe.com> <20160307003501.GB26051@windriver.com> <1457366596.15454.281.camel@hpe.com> <20160307210852.GC26051@windriver.com> <1457393912.15454.419.camel@hpe.com> <20160307235328.GD26051@windriver.com> <1457398578.15454.421.camel@hpe.com> <20160308031653.GE26051@windriver.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.18.4 (3.18.4-1.fc23) Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5661 Lines: 157 On Mon, 2016-03-07 at 22:16 -0500, Paul Gortmaker wrote: > [Re: runtime regression with "x86/mm/pat: Emulate PAT when it is > disabled"] On 07/03/2016 (Mon 17:56) Toshi Kani wrote: > > [..] > > > > > > It may have seemed working before, but you did not have WC > > > > configured > > > > to PAT without calling pat_init().  There was not a proper check in > > > > place to detect this error before.  Can you please check your code > > > > to > > > > see what caused this skip of pat_init()?  If you have a git tree, I > > > > can > > > > take a look as well.  > > > > > > You already have git copies of what I'm running, since it is vanilla > > > mainline commits.  No code changes at this end whatsoever.  I did the > > > bisect on vanilla mainline.  All I took from yocto was their > > > ".config" > > > > > > To recap, v4.1-rc5-21-g9dac62909451 works,  v4.1-rc5-22-g9cd25aac1f44 > > > fails, and v4.5-rc6 also fails.  If pat_init() isn't called then this > > > is a bug in current mainline.  I'll have a look later myself and see > > > if I can trace out how we expect to get to pat_init() and how that > > > might be skipped inadvertently unless someone beats me to it. > > > > Oh, I see.  Can you send me the ".config" file? > > I packaged the .config file for every bisect point in the original > reproducer tarball.  Let me know if you can't find them.  It should > look like this: > > paul@dell760-paul:~/qemu-fail$ ls -al 00-configs/ > total 92 > drwxrwxr-x 23 paul paul 4096 Mar  3 10:59 . > drwxrwxr-x  5 paul paul 4096 Mar  3 11:01 .. > -rw-rw-r--  1 paul paul    0 Mar  3 10:59 00-all-dot-configs-are-in-here > drwxrwxr-x  2 paul paul 4096 Mar  3 10:59 v4.1 > drwxrwxr-x  2 paul paul 4096 Mar  3 10:59 v4.1-1281-g43224b96af31 > drwxrwxr-x  2 paul paul 4096 Mar  3 10:59 v4.1-1625-g44d21c3f3a2e > drwxrwxr-x  2 paul paul 4096 Mar  3 10:59 v4.1-3251-g4e241557fc1c > drwxrwxr-x  2 paul paul 4096 Mar  3 10:59 v4.1-6547-g4570a37169d4 > drwxrwxr-x  2 paul paul 4096 Mar  3 10:59 v4.1-912-ge75c73ad6447 > drwxrwxr-x  2 paul paul 4096 Mar  3 10:59 v4.1-rc4-85-gd4688bdc6335 > drwxrwxr-x  2 paul paul 4096 Mar  3 10:59 v4.1-rc5-21-g9dac62909451 > drwxrwxr-x  2 paul paul 4096 Mar  3 10:59 v4.1-rc5-22-g9cd25aac1f44 > drwxrwxr-x  2 paul paul 4096 Mar  3 10:59 v4.1-rc5-23-g7202fdb1b329 > drwxrwxr-x  2 paul paul 4096 Mar  3 10:59 v4.1-rc5-27-gd838270e2516 > drwxrwxr-x  2 paul paul 4096 Mar  3 10:59 v4.1-rc5-35-g7ea402d01cb6 > drwxrwxr-x  2 paul paul 4096 Mar  3 10:59 v4.1-rc6-256-g9dda1658a9bd > drwxrwxr-x  2 paul paul 4096 Mar  3 10:59 v4.1-rc6-296-g7ef3d7d58d9d > drwxrwxr-x  2 paul paul 4096 Mar  3 10:59 v4.2 > drwxrwxr-x  2 paul paul 4096 Mar  3 10:59 v4.2-rc1 > drwxrwxr-x  2 paul paul 4096 Mar  3 10:59 v4.3 > drwxrwxr-x  2 paul paul 4096 Mar  3 10:59 v4.4 > drwxrwxr-x  2 paul paul 4096 Mar  3 10:59 v4.4.1 > drwxrwxr-x  2 paul paul 4096 Mar  3 10:59 v4.4.1-348-g0194c7658611 > drwxrwxr-x  2 paul paul 4096 Mar  3 10:59 v4.5-rc6 > paul@dell760-paul:~/qemu-fail$  > > Please check if they are present in the reproducer you downloaded. > Maybe somehow I uploaded a version without the config files. Yes, I have these directories, but I do not see anything under them...  Now that I do not think there is anything unique in your .config file, but it'd be still good to check.  Please send me .config file for v4.5-rc6 (if you do not have it now, .config for other ver is OK as well). $ ls -Rl .: total 84 -rw-rw-r--. 1 toshi toshi    0 Mar  3 08:59 00-all-dot-configs-are-in-here drwxrwxr-x. 2 toshi toshi 4096 Mar  3 08:59 v4.1 drwxrwxr-x. 2 toshi toshi 4096 Mar  3 08:59 v4.1-1281-g43224b96af31 drwxrwxr-x. 2 toshi toshi 4096 Mar  3 08:59 v4.1-1625-g44d21c3f3a2e drwxrwxr-x. 2 toshi toshi 4096 Mar  3 08:59 v4.1-3251-g4e241557fc1c drwxrwxr-x. 2 toshi toshi 4096 Mar  3 08:59 v4.1-6547-g4570a37169d4 drwxrwxr-x. 2 toshi toshi 4096 Mar  3 08:59 v4.1-912-ge75c73ad6447 drwxrwxr-x. 2 toshi toshi 4096 Mar  3 08:59 v4.1-rc4-85-gd4688bdc6335 drwxrwxr-x. 2 toshi toshi 4096 Mar  3 08:59 v4.1-rc5-21-g9dac62909451 drwxrwxr-x. 2 toshi toshi 4096 Mar  3 08:59 v4.1-rc5-22-g9cd25aac1f44 drwxrwxr-x. 2 toshi toshi 4096 Mar  3 08:59 v4.1-rc5-23-g7202fdb1b329 drwxrwxr-x. 2 toshi toshi 4096 Mar  3 08:59 v4.1-rc5-27-gd838270e2516 drwxrwxr-x. 2 toshi toshi 4096 Mar  3 08:59 v4.1-rc5-35-g7ea402d01cb6 drwxrwxr-x. 2 toshi toshi 4096 Mar  3 08:59 v4.1-rc6-256-g9dda1658a9bd drwxrwxr-x. 2 toshi toshi 4096 Mar  3 08:59 v4.1-rc6-296-g7ef3d7d58d9d drwxrwxr-x. 2 toshi toshi 4096 Mar  3 08:59 v4.2 drwxrwxr-x. 2 toshi toshi 4096 Mar  3 08:59 v4.2-rc1 drwxrwxr-x. 2 toshi toshi 4096 Mar  3 08:59 v4.3 drwxrwxr-x. 2 toshi toshi 4096 Mar  3 08:59 v4.4 drwxrwxr-x. 2 toshi toshi 4096 Mar  3 08:59 v4.4.1 drwxrwxr-x. 2 toshi toshi 4096 Mar  3 08:59 v4.4.1-348-g0194c7658611 drwxrwxr-x. 2 toshi toshi 4096 Mar  3 08:59 v4.5-rc6 ./v4.1: total 0 ./v4.1-1281-g43224b96af31: total 0 ./v4.1-1625-g44d21c3f3a2e: total 0 ./v4.1-3251-g4e241557fc1c: total 0 ./v4.1-6547-g4570a37169d4: total 0 ./v4.1-912-ge75c73ad6447: total 0 ./v4.1-rc4-85-gd4688bdc6335: total 0 ./v4.1-rc5-21-g9dac62909451: total 0 ./v4.1-rc5-22-g9cd25aac1f44: total 0 ./v4.1-rc5-23-g7202fdb1b329: total 0 ./v4.1-rc5-27-gd838270e2516: total 0 ./v4.1-rc5-35-g7ea402d01cb6: total 0 ./v4.1-rc6-256-g9dda1658a9bd: total 0 ./v4.1-rc6-296-g7ef3d7d58d9d: total 0 ./v4.2: total 0 ./v4.2-rc1: total 0 ./v4.3: total 0 ./v4.4: total 0 ./v4.4.1: total 0 ./v4.4.1-348-g0194c7658611: total 0 ./v4.5-rc6: total 0 Thanks, -Toshi