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Mon, 16 Apr 2018 12:37:59 -0400 From: Sasha Levin To: Steven Rostedt CC: Linus Torvalds , Petr Mladek , "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "akpm@linux-foundation.org" , "linux-mm@kvack.org" , Cong Wang , Dave Hansen , Johannes Weiner , Mel Gorman , Michal Hocko , Vlastimil Babka , Peter Zijlstra , Jan Kara , Mathieu Desnoyers , Tetsuo Handa , Byungchul Park , Tejun Heo , Pavel Machek Subject: Re: [PATCH AUTOSEL for 4.14 015/161] printk: Add console owner and waiter logic to load balance console writes Thread-Topic: [PATCH AUTOSEL for 4.14 015/161] printk: Add console owner and waiter logic to load balance console writes Thread-Index: AQHTz5h7IvK2v80d0k6VVqDoPwJEM6P4GK8AgAnYKwCAAX5DAIAAHfKAgAAFIICAAAchAIAAAugAgAAB5YCAAAMcgIAAAh8A Date: Mon, 16 Apr 2018 16:37:56 +0000 Message-ID: <20180416163754.GD2341@sasha-vm> References: <20180409001936.162706-15-alexander.levin@microsoft.com> <20180409082246.34hgp3ymkfqke3a4@pathway.suse.cz> <20180415144248.GP2341@sasha-vm> <20180416093058.6edca0bb@gandalf.local.home> <20180416113629.2474ae74@gandalf.local.home> <20180416160200.GY2341@sasha-vm> <20180416121224.2138b806@gandalf.local.home> <20180416161911.GA2341@sasha-vm> <20180416123019.4d235374@gandalf.local.home> In-Reply-To: <20180416123019.4d235374@gandalf.local.home> 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;DM5PR2101MB1014;7:0JeLbCmcWLxuKLWLCQeIXuSkCRREI4uuEYkO0cTlOW8wS6E03ShJ8FtCkt0J1n4Gse5K7d4UOep6RuPkae3+7HEMhS3XYdRJBY7xGs/64YjaoK7xQJVBp36WYPF78IutUOOCqbNMSjKyNs+Hrhk+OihNjXQ/WVipizS5paukxtb0N5QrEhW5jySACIbk94HUBXpLHrAudywX3OwpC3YWjDkqyVIfm3P+2LijwiNTDOUf6zrlN46hkpIEWGTlVD4X;20:xlwgSdtMhpEACIXj2lejPt8dRg92ryELsCqRxzWtlOUaP+oBsdgG/bBs9FY7Jh3oUoQPTEjXn6mqO+JxCFDxyFRSJ3KwUJI90kFswoGHMmxHLvBRCFUfESuqSESlXEn3HKM9cvku/B9BGALtxZkMYQpQz9DmLAJE52qDnlD/+pw= x-ms-exchange-antispam-srfa-diagnostics: SOS; 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x-microsoft-antispam-message-info: 67Crm/7GR8QgeaBgu5Oc/NbdummUdf2H/9wDjQvh7tNuci5w94wN81UbgS5rC9Y+/pqg3BEpafWybtklrpvFAS7Fh10bsmicFFWG46sdP28pBL5e3AbC6wt/PIeHMqnhjzBQaI/p8rAHtnpDeXSZNzg/WwN/d8u3zNsWivo3N+INDVrw7v/0dW1p5B+c+xSH spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="us-ascii" Content-ID: <6F4DE755B469B843A412DBA81A8E3C33@namprd21.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Office365-Filtering-Correlation-Id: 21b0796d-df18-4a35-6499-08d5a3b86891 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 21b0796d-df18-4a35-6499-08d5a3b86891 X-MS-Exchange-CrossTenant-originalarrivaltime: 16 Apr 2018 16:37:56.4520 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB1014 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 16, 2018 at 12:30:19PM -0400, Steven Rostedt wrote: >On Mon, 16 Apr 2018 16:19:14 +0000 >Sasha Levin wrote: > >> >Wait! What does that mean? What's the purpose of stable if it is as >> >broken as mainline? >> >> This just means that if there is a fix that went in mainline, and the >> fix is broken somehow, we'd rather take the broken fix than not. >> >> In this scenario, *something* will be broken, it's just a matter of >> what. We'd rather have the same thing broken between mainline and >> stable. > >Honestly, I think that removes all value of the stable series. I >remember when the stable series were first created. People were saying >that it wouldn't even get to more than 5 versions, because the bar for >backporting was suppose to be very high. Today it's just a fork of the >kernel at a given version. No more features, but we will be OK with >regressions. I'm struggling to see what the benefit of it is suppose to >be? It's not "OK with regressions". Let's look at a hypothetical example: You have a 4.15.1 kernel that has a broken printf() behaviour so that when you: pr_err("%d", 5) Would print: "Microsoft Rulez" Bad, right? So you went ahead and fixed it, and now it prints "5" as you might expect. But alas, with your patch, running: pr_err("%s", "hi!") Would show a cat picture for 5 seconds. Should we take your patch in -stable or not? If we don't, we're stuck with the original issue while the mainline kernel will behave differently, but if we do - we introduce a new regression. So it's not the case that a -stable kernel will have *more* regression, it'll just have similar ones to mainline.=