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Sun, 15 Apr 2018 10:34:56 -0400 From: Sasha Levin To: Petr Mladek CC: "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "Steven Rostedt (VMware)" , "akpm@linux-foundation.org" , "linux-mm@kvack.org" , Cong Wang , Dave Hansen , Johannes Weiner , Mel Gorman , Michal Hocko , Vlastimil Babka , Peter Zijlstra , Linus Torvalds , Jan Kara , Mathieu Desnoyers , Tetsuo Handa , Byungchul Park , Tejun Heo , Pavel Machek Subject: Re: [PATCH AUTOSEL for 4.15 019/189] printk: Add console owner and waiter logic to load balance console writes Thread-Topic: [PATCH AUTOSEL for 4.15 019/189] printk: Add console owner and waiter logic to load balance console writes Thread-Index: AQHTz5gTpP6JXfT76UOTL5UYuogqGqP4Fq6AgAnX8IA= Date: Sun, 15 Apr 2018 14:34:52 +0000 Message-ID: <20180415143447.GL2341@sasha-vm> References: <20180409001637.162453-1-alexander.levin@microsoft.com> <20180409001637.162453-19-alexander.levin@microsoft.com> <20180409081535.dq7p5bfnpvd3xk3t@pathway.suse.cz> In-Reply-To: <20180409081535.dq7p5bfnpvd3xk3t@pathway.suse.cz> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB1047;7:8IWYML0yhMUn991k8MJRqL40w6UkXqltFuyBd0Q1aZxNgzZAdohZLe4oFwo0W1qHmmj9kuM1SwrWhDH5Cm+X3ZlQPQ6NDBNByHLfN4kF0Qa/ka+Na0XQcInXCVloLDr9r+PmjyiDfJh/uvv02J44BPbfrgOb6Ccc8dA49ZrwQ4mHFYO5g2WjxWw6H0s+5ZRDrDBEWyEj+WA6Yr99kYdTrsw8oJBn989nn9XzdJzjXOKqQ6+GLIO5wK/NRqdetvRE;20:NBOKk7wXGZO61WeYsvPN+JmkSLl5Xc9jVqYThkYLexVfpmBvUj2rF+hOUCeBTxdk6JfWz5gbi2ezIJ3y69jQg7gpm8/g6BzCmSj5P6BUibfdeM2BqpF2h8YWzSt8pBaS5MVCyDR1AcC5TtPEBwW20IhaWVUKxoA8Z1ucdIbPtmw= x-ms-exchange-antispam-srfa-diagnostics: SOS; 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x-microsoft-antispam-message-info: wR89cWLlK1mdK1hJH6B26l9zFTWVcpUZW7snBYUrZpFlD/fGa/dLxYvcc0TFT4xfZCnO/7sf2U8J1XF5TIUbytJ6oPAAFF7sNKoHKW3nFSMkanU4G7lA+F5IZlSQyboc+u7qea3yvT1KfLUNmNrDGJWaW8irOlwVHpo3G9ESzs8/otL/fTkiRe/vixBsXN/K spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="us-ascii" Content-ID: <95004968C9AACD4EB8F524BAB47FDE97@namprd21.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Office365-Filtering-Correlation-Id: e1d4dd8f-e37b-40f3-5ab7-08d5a2de0ce4 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: e1d4dd8f-e37b-40f3-5ab7-08d5a2de0ce4 X-MS-Exchange-CrossTenant-originalarrivaltime: 15 Apr 2018 14:34:52.3603 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB1047 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On Mon, Apr 09, 2018 at 10:15:35AM +0200, Petr Mladek wrote: >On Mon 2018-04-09 00:16:59, Sasha Levin wrote: >> From: "Steven Rostedt (VMware)" >> >> [ Upstream commit dbdda842fe96f8932bae554f0adf463c27c42bc7 ] >> >> This patch implements what I discussed in Kernel Summit. I added >> lockdep annotation (hopefully correctly), and it hasn't had any splats >> (since I fixed some bugs in the first iterations). It did catch >> problems when I had the owner covering too much. But now that the owner >> is only set when actively calling the consoles, lockdep has stayed >> quiet. > >I do not think that this is a material for stable backports. Yes, it >is a fix but it is not trivial. There are already 3 follow up commits: > >c162d5b4338d72deed6 ("printk: Hide console waiter logic into helpers") >fd5f7cde1b85d4c8e09 ("printk: Never set console_may_schedule in > console_trylock()") >c14376de3a1befa70d9 ("printk: Wake klogd when passing console_lock owner") > >One is just a code clean up but the other two are changes/fixes that >should go together with Steven's patch. > >These changes tries to prevent softlockups. It is a problem that is >being discussed for years. We are still waiting for feedback to see if >more changes will be necessary. IMHO, there is no reason to hurry and >backport it everywhere. > >Best Regards, >Petr I'll remove it, thanks Petr!=