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Mon, 16 Apr 2018 12:53:05 -0400 From: Sasha Levin To: Steven Rostedt CC: Pavel Machek , 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 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: AQHTz5h7IvK2v80d0k6VVqDoPwJEM6P4GK8AgAnYKwCAAX5DAIAAHfKAgAADdYCAAAWWgIAABF0AgAACQQCAAAJjAIAAAleAgAAEfoCAAAGdAA== Date: Mon, 16 Apr 2018 16:53:00 +0000 Message-ID: <20180416165258.GH2341@sasha-vm> References: <20180415144248.GP2341@sasha-vm> <20180416093058.6edca0bb@gandalf.local.home> <20180416153031.GA5039@amd> <20180416155031.GX2341@sasha-vm> <20180416160608.GA7071@amd> <20180416161412.GZ2341@sasha-vm> <20180416122244.146aec48@gandalf.local.home> <20180416163107.GC2341@sasha-vm> <20180416124711.048f1858@gandalf.local.home> In-Reply-To: <20180416124711.048f1858@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;DM5PR2101MB0967;7:adCCv90Ft0/Yksk7E/mZ41eyycOAG1iBC/ZLW4XcsobUykQ//kX1NdVsGdMSK4+Rl1Z1CEQ99m3RPjUAzR1IUeQAWuwk3+1aYMTUvMGoL0ae2z2XinZHFlpfH9lTZxRRhomO+MxULNssg27k1VUNf3q2rKiQixqzhE9KCkxdGtOU10iwOwkdDDUnk7bbHoKz+8XKC/z2wkeQnyYL1RfJkqB9EoSkcp4Ietu0p2Baunwt5m0yb4EwjROh2uZXMW28;20:WFG0eHhcHGIwjJ7KBp98+04INcqs8juq78yX329O7M2ZZRQROTQ3usKmWy89DqDy5dlhbNjihJ359OADam2PXU2kRAE6buktq/a1DOtcxvXVzzBSVI6RMLmvX3SiJRt9dyV9cbkTEEOeBe7ZZ03p4CTvuwGjv3XqvRz85nq+CPg= x-ms-exchange-antispam-srfa-diagnostics: SOS; x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(4534165)(4627221)(201703031133081)(201702281549075)(5600026)(2017052603328)(7193020);SRVR:DM5PR2101MB0967; x-ms-traffictypediagnostic: DM5PR2101MB0967: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(28532068793085)(89211679590171); x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(8211001083)(61425038)(6040522)(2401047)(8121501046)(5005006)(3231232)(944501347)(52105095)(93006095)(93001095)(10201501046)(3002001)(6055026)(61426038)(61427038)(6041310)(20161123560045)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123564045)(20161123558120)(20161123562045)(6072148)(201708071742011);SRVR:DM5PR2101MB0967;BCL:0;PCL:0;RULEID:;SRVR:DM5PR2101MB0967; x-forefront-prvs: 0644578634 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(7916004)(346002)(39860400002)(39380400002)(396003)(376002)(366004)(189003)(199004)(6436002)(6116002)(3846002)(316002)(93886005)(186003)(14454004)(7736002)(68736007)(54906003)(486006)(39060400002)(3660700001)(3280700002)(10090500001)(6246003)(10290500003)(26005)(6916009)(53936002)(6486002)(102836004)(2906002)(478600001)(72206003)(305945005)(99286004)(9686003)(6512007)(4326008)(1076002)(66066001)(229853002)(11346002)(476003)(446003)(5250100002)(25786009)(5660300001)(76176011)(22452003)(33716001)(8676002)(33896004)(97736004)(81166006)(81156014)(105586002)(33656002)(7416002)(6506007)(86362001)(86612001)(2900100001)(106356001)(8936002)(217873001);DIR:OUT;SFP:1102;SCL:1;SRVR:DM5PR2101MB0967;H:DM5PR2101MB1032.namprd21.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;MX:1;A:1; x-microsoft-antispam-message-info: pRI4hYeuDJF2XAo8xsh37Mh144iCiQYhXqnKi9RsV1caME4cqC+WsrOGt9G5tMJLiilIBIAxPi9LxFBtrNJqNjqMduFCGYOTUx/wxs+0RUO26C0D4OH4RpThwhUfwe/A4FvFDxEWfmbWeSGEnx2OuBUdw7ajWquAQPJzrIhsw1qn8kffuMYMaOZiucg/YmJx spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="us-ascii" Content-ID: <350FC0434CF1254DBE9401FFE3F4C425@namprd21.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Office365-Filtering-Correlation-Id: 79c725c1-dbe3-4cd9-a72b-08d5a3ba8376 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 79c725c1-dbe3-4cd9-a72b-08d5a3ba8376 X-MS-Exchange-CrossTenant-originalarrivaltime: 16 Apr 2018 16:53:00.5937 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB0967 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 12:47:11PM -0400, Steven Rostedt wrote: >On Mon, 16 Apr 2018 16:31:09 +0000 >Sasha Levin wrote: > >> On Mon, Apr 16, 2018 at 12:22:44PM -0400, Steven Rostedt wrote: >> >On Mon, 16 Apr 2018 16:14:15 +0000 >> >Sasha Levin wrote: >> > >> >> Since the rate we're seeing now with AUTOSEL is similar to what we we= re >> >> seeing before AUTOSEL, what's the problem it's causing? >> > >> >Does that mean we just doubled the rate of regressions? That's the >> >problem. >> >> No, the rate stayed the same :) >> >> If before ~2% of stable commits were buggy, this is still the case with >> AUTOSEL. > >Sorry, I didn't mean "rate" I meant "number". If the rate stayed the >same, that means the number increased. Indeed, just like the number of regressions in mainline has increased over time. >> >> >> >> >> How do you know if a bug bothers someone? >> >> >> >> If a user is annoyed by a LED issue, is he expected to triage the bug= , >> >> report it on LKML and patiently wait for the appropriate patch to be >> >> backported? >> > >> >Yes. >> >> I'm honestly not sure how to respond. >> >> Let me ask my wife (who is happy using Linux as a regular desktop user) >> how comfortable she would be with triaging kernel bugs... > >That's really up to the distribution, not the main kernel stable. Does >she download and compile the kernels herself? Does she use LEDs? > >The point is, stable is to keep what was working continued working. >If we don't care about introducing a regression, and just want to keep >regressions the same as mainline, why not just go to mainline? That way >you can also get the new features? Mainline already has the mantra to >not break user space. When I work on new features, I sometimes stumble >on bugs with the current features. And some of those fixes require a >rewrite. It was "good enough" before, but every so often could cause a >bug that the new feature would trigger more often. Do we back port that >rewrite? Do we backport fixes to old code that are more likely to be >triggered by new features? > >Ideally, we should be working on getting to no regressions to stable. This is exactly what we're doing. If a fix for a bug in -stable introduces a different regression, should we take it or not?=