From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Bart Van Assche To: "paolo.valente@linaro.org" , "linus.walleij@linaro.org" CC: "linux-kernel@vger.kernel.org" , "linux-block@vger.kernel.org" , "fchecconi@gmail.com" , "axboe@kernel.dk" , "broonie@kernel.org" , "avanzini.arianna@gmail.com" , "tj@kernel.org" , "ulf.hansson@linaro.org" Subject: Re: [PATCH RFC 00/14] Add the BFQ I/O Scheduler to blk-mq Date: Sat, 18 Mar 2017 17:46:47 +0000 Message-ID: <1489859192.2339.12.camel@sandisk.com> References: <20170304160131.57366-1-paolo.valente@linaro.org> <1488848390.3125.14.camel@sandisk.com> <81048010-02AB-4A7A-8C10-FAF7E3242DCC@linaro.org> <1489509154.2676.6.camel@sandisk.com> In-Reply-To: Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Return-Path: Bart.VanAssche@sandisk.com List-ID: T24gU2F0LCAyMDE3LTAzLTE4IGF0IDE4OjA5ICswMTAwLCBMaW51cyBXYWxsZWlqIHdyb3RlOg0K PiBPbiBTYXQsIE1hciAxOCwgMjAxNyBhdCAxMTo1MiBBTSwgUGFvbG8gVmFsZW50ZQ0KPiA8cGFv 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linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by mail.home.local id v2IHoaMf006971 On Sat, 2017-03-18 at 18:09 +0100, Linus Walleij wrote: > On Sat, Mar 18, 2017 at 11:52 AM, Paolo Valente > wrote: > > > Il giorno 14 mar 2017, alle ore 16:32, Bart Van Assche ha scritto: > > > (...) what should > > > a developer do who only has access to a small subset of all the storage > > > devices that are supported by the Linux kernel and hence who can not run the > > > benchmark against every supported storage device? > > Don't we use the community for that? We are dependent on people > downloading and testing our code eventually, I mean sure it's good if > we make some reasonable effort to test changes we do, but we are > only humans, and we get corrected by the experience of other humans. Hello Linus, Do you mean relying on the community to test other storage devices before or after a patch is upstream? Relying on the community to file bug reports after a patch is upstream would be wrong. The Linux kernel should not be used for experiments. As you know patches that are sent upstream should not introduce regressions. My primary concern about BFQ is that it is a very complicated I/O scheduler and also that the concepts used internally in that I/O scheduler are far away from the concepts we are used to when reasoning about I/O devices. I'm concerned that this will make the BFQ I/O scheduler hard to maintain. Bart.