From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Bart Van Assche To: "paolo.valente@linaro.org" CC: "linux-kernel@vger.kernel.org" , "linux-block@vger.kernel.org" , "fchecconi@gmail.com" , "linus.walleij@linaro.org" , "axboe@kernel.dk" , "avanzini.arianna@gmail.com" , "broonie@kernel.org" , "tj@kernel.org" , "ulf.hansson@linaro.org" Subject: Re: [PATCH RFC 01/14] block, bfq: introduce the BFQ-v0 I/O scheduler as an extra scheduler Date: Sat, 18 Mar 2017 15:24:34 +0000 Message-ID: <1489850658.2339.1.camel@sandisk.com> References: <20170304160131.57366-1-paolo.valente@linaro.org> <20170304160131.57366-2-paolo.valente@linaro.org> <1D08B61A9CF0974AA09887BE32D889DA0DA145@ULS-OP-MBXIP03.sdcorp.global.sandisk.com> <0B1F1CFD-C8AB-442D-B5C6-426D19B1FBA3@linaro.org> In-Reply-To: <0B1F1CFD-C8AB-442D-B5C6-426D19B1FBA3@linaro.org> Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Return-Path: Bart.VanAssche@sandisk.com List-ID: T24gU2F0LCAyMDE3LTAzLTE4IGF0IDA4OjA4IC0wNDAwLCBQYW9sbyBWYWxlbnRlIHdyb3RlOg0K PiA+IElsIGdpb3JubyAwNiBtYXIgMjAxNywgYWxsZSBvcmUgMTQ6NDAsIEJhcnQgVmFuIEFzc2No ZSA8YmFydC52YW5hc3NjaGVAc2FuZGlzay5jb20+IGhhIHNjcml0dG86DQo+ID4gPiArI2RlZmlu ZSBCRlFfQkZRUV9GTlMobmFtZSkJCQkJCQlcDQo+ID4gPiArc3RhdGljIHZvaWQgYmZxX21hcmtf YmZxcV8jI25hbWUoc3RydWN0IGJmcV9xdWV1ZSAqYmZxcSkJCVwNCj4gPiA+ICt7CQkJCQkJCQkJ XA0KPiA+ID4gKwkoYmZxcSktPmZsYWdzIHw9ICgxIDw8IEJGUV9CRlFRX0ZMQUdfIyNuYW1lKTsJ CQlcDQo+ID4gPiArfQkJCQkJCQkJCVwNCj4gPiA+ICtzdGF0aWMgdm9pZCBiZnFfY2xlYXJfYmZx cV8jI25hbWUoc3RydWN0IGJmcV9xdWV1ZSAqYmZxcSkJCVwNCj4gPiA+ICt7CQkJCQkJCQkJXA0K PiA+ID4gKwkoYmZxcSktPmZsYWdzICY9IH4oMSA8PCBCRlFfQkZRUV9GTEFHXyMjbmFtZSk7CQkJ XA0KPiA+ID4gK30JCQkJCQkJCQlcDQo+ID4gPiArc3RhdGljIGludCBiZnFfYmZxcV8jI25hbWUo Y29uc3Qgc3RydWN0IGJmcV9xdWV1ZSAqYmZxcSkJCVwNCj4gPiA+ICt7CQkJCQkJCQkJXA0KPiA+ ID4gKwlyZXR1cm4gKChiZnFxKS0+ZmxhZ3MgJiAoMSA8PCBCRlFfQkZRUV9GTEFHXyMjbmFtZSkp ICE9IDA7CVwNCj4gPiA+ICt9DQo+ID4gDQo+ID4gQXJlIHRoZSBib2RpZXMgb2YgdGhlIGFib3Zl IGZ1bmN0aW9ucyBkdXBsaWNhdGVzIG9mIF9fc2V0X2JpdCgpLA0KPiA+IF9fY2xlYXJfYml0KCkg YW5kIHRlc3RfYml0KCk/DQo+IA0KPiBZZXMuICBXZSB3cmFwcGVkIHRoZW0gaW50byBmdW5jdGlv bnMsIGJlY2F1c2Ugd3JpdGluZyBtYXJrX2ZsYWdfbmFtZQ0KPiBzZWVtZWQgbW9yZSByZWFkYWJs ZSB0aGFuIHdyaXRpbmcgdGhlIGltcGxlbWVudGF0aW9uIG9mIHRoZSBtYXJraW5nIG9mIHRoZQ0K PiBmbGFnLg0KDQpQbGVhc2UgZG8gbm90IG9wZW4tY29kZSBfX3NldF9iaXQoKSwgX19jbGVhcl9i aXQoKSBhbmQgdGVzdF9iaXQoKSBidXQgdXNlDQp0aGVzZSBtYWNyb3MgaW5zdGVhZC4NCg0KPiA+ ID4gKwl9IGVsc2UNCj4gPiA+ICsJCS8qDQo+ID4gPiArCQkgKiBBc3luYyBxdWV1ZXMgZ2V0IGFs d2F5cyB0aGUgbWF4aW11bSBwb3NzaWJsZQ0KPiA+ID4gKwkJICogYnVkZ2V0LCBhcyBmb3IgdGhl bSB3ZSBkbyBub3QgY2FyZSBhYm91dCBsYXRlbmN5DQo+ID4gPiArCQkgKiAoaW4gYWRkaXRpb24s IHRoZWlyIGFiaWxpdHkgdG8gZGlzcGF0Y2ggaXMgbGltaXRlZA0KPiA+ID4gKwkJICogYnkgdGhl IGNoYXJnaW5nIGZhY3RvcikuDQo+ID4gPiArCQkgKi8NCj4gPiA+ICsJCWJ1ZGdldCA9IGJmcWQt PmJmcV9tYXhfYnVkZ2V0Ow0KPiA+ID4gKw0KPiA+IA0KPiA+IFBsZWFzZSBiYWxhbmNlIGJyYWNl cy4gQ2hlY2twYXRjaCBzaG91bGQgaGF2ZSB3YXJuZWQgYWJvdXQgdGhlIHVzZSBvZiAifQ0KPiA+ IGVsc2UiIGluc3RlYWQgb2YgIn0gZWxzZSB7Ii4NCj4gDQo+IE5vIHdhcm5pbmcsIEkgZ3Vlc3Mg YmVjYXVzZSB0aGUgYm9keSBvZiB0aGUgZWxzZSBjb250YWlucyBvbmx5IGENCj4gc2ltcGxlIGlu c3RydWN0aW9uLiAgSnVzdCB0byBsZWFybiBmb3IgdGhlIGZ1dHVyZTogd2hhdCdzIHRoZQ0KPiBy YXRpb25hbGUgZm9yIGFkZGluZyBicmFjZXMgaGVyZSwgYnV0IG5vdCBpbXBvc2luZyBicmFjZXMg ZXZlcnl3aGVyZQ0KPiBmb3Igc2luZ2xlLWluc3RydWN0aW9uIGJvZGllcz8NCg0KSXQncyBhIGdl bmVyYWwgc3R5bGUgcmVjb21tZW5kYXRpb24gZm9yIGFsbCBrZXJuZWwgY29kZTogaWYgYnJhY2Vz IGFyZSB1c2VkDQpmb3Igb25lIHNpZGUgb2YgYW4gaWYtc3RhdGVtZW50LCBhbHNvIHVzZSBicmFj ZXMgZm9yIHRoZSBvdGhlciBzaWRlLCBhbmQNCmRlZmluaXRlbHkgaWYgdGhhdCBvdGhlciBzaWRl IGNvbnNpc3RzIG9mIG11bHRpcGxlIGxpbmVzIGR1ZSB0byBhIGNvbW1lbnQuDQoNCkJhcnQu