From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Bart Van Assche To: "linux-scsi@vger.kernel.org" , "linux-block@vger.kernel.org" , Damien Le Moal , "martin.petersen@oracle.com" , "axboe@kernel.dk" CC: "hch@lst.de" Subject: Re: [PATCH V6 13/14] block: mq-deadline: Limit write request dispatch for zoned block devices Date: Tue, 3 Oct 2017 20:56:09 +0000 Message-ID: <1507064168.2567.33.camel@wdc.com> References: <20171002071535.8007-1-damien.lemoal@wdc.com> <20171002071535.8007-14-damien.lemoal@wdc.com> <1506987846.3368.69.camel@wdc.com> In-Reply-To: Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 List-ID: T24gVHVlLCAyMDE3LTEwLTAzIGF0IDA5OjE5ICswOTAwLCBEYW1pZW4gTGUgTW9hbCB3cm90ZToN Cj4gT24gMTAvMy8xNyAwODo0NCwgQmFydCBWYW4gQXNzY2hlIHdyb3RlOg0KPiA+IE9uIE1vbiwg MjAxNy0xMC0wMiBhdCAxNjoxNSArMDkwMCwgRGFtaWVuIExlIE1vYWwgd3JvdGU6DQo+ID4gPiAg c3RhdGljIHZvaWQgZGVhZGxpbmVfd3VubG9ja196b25lKHN0cnVjdCBkZWFkbGluZV9kYXRhICpk ZCwNCj4gPiA+ICAJCQkJICBzdHJ1Y3QgcmVxdWVzdCAqcnEpDQo+ID4gPiAgew0KPiA+ID4gKwl1 bnNpZ25lZCBsb25nIGZsYWdzOw0KPiA+ID4gKw0KPiA+ID4gKwlzcGluX2xvY2tfaXJxc2F2ZSgm ZGQtPnpvbmVfbG9jaywgZmxhZ3MpOw0KPiA+ID4gKw0KPiA+ID4gIAlXQVJOX09OX09OQ0UoIXRl c3RfYW5kX2NsZWFyX2JpdChibGtfcnFfem9uZV9ubyhycSksIGRkLT56b25lc193bG9jaykpOw0K PiA+ID4gIAlkZWFkbGluZV9jbGVhcl9yZXF1ZXN0X3pvbmVfd2xvY2socnEpOw0KPiA+ID4gKw0K PiA+ID4gKwlzcGluX3VubG9ja19pcnFyZXN0b3JlKCZkZC0+em9uZV9sb2NrLCBmbGFncyk7DQo+ ID4gPiAgfQ0KPiA+IA0KPiA+IElzIGEgcmVxdWVzdCByZW1vdmVkIGZyb20gdGhlIHNvcnQgYW5k IGZpZm8gbGlzdHMgYmVmb3JlIGJlaW5nIGRpc3BhdGNoZWQ/IElmIHNvLA0KPiA+IGRvZXMgdGhh dCBtZWFuIHRoYXQgb2J0YWluaW5nIHpvbmVfbG9jayBpbiB0aGUgYWJvdmUgZnVuY3Rpb24gaXMg bm90IG5lY2Vzc2FyeT8NCj4gDQo+IFllcywgYSByZXF1ZXN0IGlzIHJlbW92ZWQgZnJvbSB0aGUg c29ydCB0cmVlIGFuZCBmaWZvIGxpc3QgYmVmb3JlDQo+IGRpc3BhdGNoaW5nLiBCdXQgdGhlIGRk LT56b25lX2xvY2sgc3BpbmxvY2sgaXMgbm90IHRoZXJlIHRvIHByb3RlY3QNCj4gdGhhdCwgZGQt PmxvY2sgcHJvdGVjdHMgdGhlIHNvcnQgdHJlZSBhbmQgZmlmbyBsaXN0LiBkZC0+em9uZV9sb2Nr IHdhcw0KPiBhZGRlZCB0byBwcmV2ZW50IHRoZSBjb21wbGV0ZWRfcmVxdWVzdCgpIG1ldGhvZCBm cm9tIGNoYW5naW5nIGEgem9uZQ0KPiBsb2NrIHN0YXRlIHdoaWxlIGRlYWRsaW5lX2ZpZm9fcmVx dWVzdHMoKSBvciBkZWFkbGluZV9uZXh0X3JlcXVlc3QoKSBhcmUNCj4gcnVubmluZy4gRXg6DQo+ IA0KPiBJbWFnaW5lIHRoaXMgY2FzZTogd3JpdGUgcmVxdWVzdCBBIGZvciBhIHpvbmUgWiBpcyBi ZWluZyBleGVjdXRlZCAoaXQNCj4gd2FzIGRpc3BhdGNoZWQpIHNvIFogaXMgbG9ja2VkLiBEaXNw YXRjaCBydW5zIGFuZCBpbnNwZWN0cyB0aGUgbmV4dA0KPiByZXF1ZXN0cyBpbiBzb3J0IG9yZGVy LiBMZXQgc2F5IHdlIGhhdmUgdGhlIHNlcXVlbnRpYWwgd3JpdGVzIEIsIEMsIEQsIEUNCj4gcXVl dWVkIGZvciB0aGUgc2FtZSB6b25lIFouIEZpcnN0IEIgaXMgaW5zcGVjdGVkIGFuZCBjYW5ub3Qg YmUNCj4gZGlzcGF0Y2hlZCAoem9uZSBsb2NrZWQpLiBJbnNwZWN0aW9uIG1vdmUgb24gdG8gQywg YnV0IGJlZm9yZSB0aGUgdGhhdCwNCj4gQSBjb21wbGV0ZXMgYW5kIFogaXMgdW5sb2NrZWQuIFRo ZW4gQyB3aWxsIGJlIE9LIHRvIGdvIGFzIHRoZSB6b25lIGlzDQo+IG5vdyB1bmxvY2tlZC4gQnV0 IGl0IGlzIHRoZSB3cm9uZyBjaG9pY2UgYXMgaXQgd2lsbCByZXN1bHQgaW4gb3V0IG9mDQo+IG9y ZGVyIHdyaXRlLiBCIG11c3QgYmUgdGhlIG5leHQgcmVxdWVzdCBkaXNwYXRjaGVkIGFmdGVyIEEu DQo+IA0KPiBkZC0+em9uZV9sb2NrIHByZXZlbnRzIHRoaXMgZnJvbSBoYXBwZW5pbmcuIFdpdGhv dXQgdGhpcyBzcGlubG9jaywgdGhlDQo+IGJhZCBleGFtcGxlIGNhc2UgYWJvdmUgaGFwcGVucyB2 ZXJ5IGVhc2lseS4NCg0KSGVsbG8gRGFtaWVuLA0KDQpUaGFua3MgZm9yIHRoZSBkZXRhaWxlZCBh bmQgcmVhbGx5IGNsZWFyIHJlcGx5LiBJIGhvcGUgeW91IGRvIG5vdCBtaW5kIHRoYXQgSQ0KaGF2 ZSBhIGZldyBmdXJ0aGVyIHF1ZXN0aW9ucyBhYm91dCB0aGlzIHBhdGNoPw0KLSBEb2VzIHRoZSB6 b25lX2xvY2sgc3BpbmxvY2sgaGF2ZSB0byBiZSBhY3F1aXJlZCBieSBib3RoIGRlYWRsaW5lX3d1 bmxvY2tfem9uZSgpDQogIGNhbGxlcnMgb3Igb25seSBieSB0aGUgY2FsbCBmcm9tIHRoZSByZXF1 ZXN0IGNvbXBsZXRpb24gcGF0aD8NCi0gV2h5IGRvIGJvdGggdGhlIG1xLWRlYWRsaW5lIGFuZCB0 aGUgc2QgZHJpdmVyIGVhY2ggaGF2ZSB0aGVpciBvd24gaW5zdGFuY2Ugb2YNCiAgdGhlIHpvbmVz X3dsb2NrIGJpdG1hcD8gSGFzIGl0IGJlZW4gY29uc2lkZXJlZCB0byBjb252ZXJ0IGJvdGggYml0 bWFwcyBpbnRvIGENCiAgc2luZ2xlIGJpdG1hcCB0aGF0IGlzIHNoYXJlZCBieSBib3RoIGtlcm5l bCBjb21wb25lbnRzIGFuZCB0aGF0IGV4aXN0cyBlLmcuIGF0DQogIHRoZSByZXF1ZXN0IHF1ZXVl IGxldmVsPw0KDQpUaGFua3MsDQoNCkJhcnQu From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bart Van Assche Subject: Re: [PATCH V6 13/14] block: mq-deadline: Limit write request dispatch for zoned block devices Date: Tue, 3 Oct 2017 20:56:09 +0000 Message-ID: <1507064168.2567.33.camel@wdc.com> References: <20171002071535.8007-1-damien.lemoal@wdc.com> <20171002071535.8007-14-damien.lemoal@wdc.com> <1506987846.3368.69.camel@wdc.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: Content-Language: en-US Content-ID: <00B588C30A3EE04A955BD795EF1E552A@namprd04.prod.outlook.com> Sender: linux-block-owner@vger.kernel.org To: "linux-scsi@vger.kernel.org" , "linux-block@vger.kernel.org" , Damien Le Moal , "martin.petersen@oracle.com" , "axboe@kernel.dk" Cc: "hch@lst.de" List-Id: linux-scsi@vger.kernel.org T24gVHVlLCAyMDE3LTEwLTAzIGF0IDA5OjE5ICswOTAwLCBEYW1pZW4gTGUgTW9hbCB3cm90ZToN Cj4gT24gMTAvMy8xNyAwODo0NCwgQmFydCBWYW4gQXNzY2hlIHdyb3RlOg0KPiA+IE9uIE1vbiwg MjAxNy0xMC0wMiBhdCAxNjoxNSArMDkwMCwgRGFtaWVuIExlIE1vYWwgd3JvdGU6DQo+ID4gPiAg c3RhdGljIHZvaWQgZGVhZGxpbmVfd3VubG9ja196b25lKHN0cnVjdCBkZWFkbGluZV9kYXRhICpk ZCwNCj4gPiA+ICAJCQkJICBzdHJ1Y3QgcmVxdWVzdCAqcnEpDQo+ID4gPiAgew0KPiA+ID4gKwl1 bnNpZ25lZCBsb25nIGZsYWdzOw0KPiA+ID4gKw0KPiA+ID4gKwlzcGluX2xvY2tfaXJxc2F2ZSgm ZGQtPnpvbmVfbG9jaywgZmxhZ3MpOw0KPiA+ID4gKw0KPiA+ID4gIAlXQVJOX09OX09OQ0UoIXRl c3RfYW5kX2NsZWFyX2JpdChibGtfcnFfem9uZV9ubyhycSksIGRkLT56b25lc193bG9jaykpOw0K PiA+ID4gIAlkZWFkbGluZV9jbGVhcl9yZXF1ZXN0X3pvbmVfd2xvY2socnEpOw0KPiA+ID4gKw0K PiA+ID4gKwlzcGluX3VubG9ja19pcnFyZXN0b3JlKCZkZC0+em9uZV9sb2NrLCBmbGFncyk7DQo+ ID4gPiAgfQ0KPiA+IA0KPiA+IElzIGEgcmVxdWVzdCByZW1vdmVkIGZyb20gdGhlIHNvcnQgYW5k IGZpZm8gbGlzdHMgYmVmb3JlIGJlaW5nIGRpc3BhdGNoZWQ/IElmIHNvLA0KPiA+IGRvZXMgdGhh dCBtZWFuIHRoYXQgb2J0YWluaW5nIHpvbmVfbG9jayBpbiB0aGUgYWJvdmUgZnVuY3Rpb24gaXMg bm90IG5lY2Vzc2FyeT8NCj4gDQo+IFllcywgYSByZXF1ZXN0IGlzIHJlbW92ZWQgZnJvbSB0aGUg c29ydCB0cmVlIGFuZCBmaWZvIGxpc3QgYmVmb3JlDQo+IGRpc3BhdGNoaW5nLiBCdXQgdGhlIGRk LT56b25lX2xvY2sgc3BpbmxvY2sgaXMgbm90IHRoZXJlIHRvIHByb3RlY3QNCj4gdGhhdCwgZGQt PmxvY2sgcHJvdGVjdHMgdGhlIHNvcnQgdHJlZSBhbmQgZmlmbyBsaXN0LiBkZC0+em9uZV9sb2Nr IHdhcw0KPiBhZGRlZCB0byBwcmV2ZW50IHRoZSBjb21wbGV0ZWRfcmVxdWVzdCgpIG1ldGhvZCBm cm9tIGNoYW5naW5nIGEgem9uZQ0KPiBsb2NrIHN0YXRlIHdoaWxlIGRlYWRsaW5lX2ZpZm9fcmVx dWVzdHMoKSBvciBkZWFkbGluZV9uZXh0X3JlcXVlc3QoKSBhcmUNCj4gcnVubmluZy4gRXg6DQo+ IA0KPiBJbWFnaW5lIHRoaXMgY2FzZTogd3JpdGUgcmVxdWVzdCBBIGZvciBhIHpvbmUgWiBpcyBi ZWluZyBleGVjdXRlZCAoaXQNCj4gd2FzIGRpc3BhdGNoZWQpIHNvIFogaXMgbG9ja2VkLiBEaXNw YXRjaCBydW5zIGFuZCBpbnNwZWN0cyB0aGUgbmV4dA0KPiByZXF1ZXN0cyBpbiBzb3J0IG9yZGVy LiBMZXQgc2F5IHdlIGhhdmUgdGhlIHNlcXVlbnRpYWwgd3JpdGVzIEIsIEMsIEQsIEUNCj4gcXVl dWVkIGZvciB0aGUgc2FtZSB6b25lIFouIEZpcnN0IEIgaXMgaW5zcGVjdGVkIGFuZCBjYW5ub3Qg YmUNCj4gZGlzcGF0Y2hlZCAoem9uZSBsb2NrZWQpLiBJbnNwZWN0aW9uIG1vdmUgb24gdG8gQywg YnV0IGJlZm9yZSB0aGUgdGhhdCwNCj4gQSBjb21wbGV0ZXMgYW5kIFogaXMgdW5sb2NrZWQuIFRo ZW4gQyB3aWxsIGJlIE9LIHRvIGdvIGFzIHRoZSB6b25lIGlzDQo+IG5vdyB1bmxvY2tlZC4gQnV0 IGl0IGlzIHRoZSB3cm9uZyBjaG9pY2UgYXMgaXQgd2lsbCByZXN1bHQgaW4gb3V0IG9mDQo+IG9y ZGVyIHdyaXRlLiBCIG11c3QgYmUgdGhlIG5leHQgcmVxdWVzdCBkaXNwYXRjaGVkIGFmdGVyIEEu DQo+IA0KPiBkZC0+em9uZV9sb2NrIHByZXZlbnRzIHRoaXMgZnJvbSBoYXBwZW5pbmcuIFdpdGhv dXQgdGhpcyBzcGlubG9jaywgdGhlDQo+IGJhZCBleGFtcGxlIGNhc2UgYWJvdmUgaGFwcGVucyB2 ZXJ5IGVhc2lseS4NCg0KSGVsbG8gRGFtaWVuLA0KDQpUaGFua3MgZm9yIHRoZSBkZXRhaWxlZCBh bmQgcmVhbGx5IGNsZWFyIHJlcGx5LiBJIGhvcGUgeW91IGRvIG5vdCBtaW5kIHRoYXQgSQ0KaGF2 ZSBhIGZldyBmdXJ0aGVyIHF1ZXN0aW9ucyBhYm91dCB0aGlzIHBhdGNoPw0KLSBEb2VzIHRoZSB6 b25lX2xvY2sgc3BpbmxvY2sgaGF2ZSB0byBiZSBhY3F1aXJlZCBieSBib3RoIGRlYWRsaW5lX3d1 bmxvY2tfem9uZSgpDQogIGNhbGxlcnMgb3Igb25seSBieSB0aGUgY2FsbCBmcm9tIHRoZSByZXF1 ZXN0IGNvbXBsZXRpb24gcGF0aD8NCi0gV2h5IGRvIGJvdGggdGhlIG1xLWRlYWRsaW5lIGFuZCB0 aGUgc2QgZHJpdmVyIGVhY2ggaGF2ZSB0aGVpciBvd24gaW5zdGFuY2Ugb2YNCiAgdGhlIHpvbmVz X3dsb2NrIGJpdG1hcD8gSGFzIGl0IGJlZW4gY29uc2lkZXJlZCB0byBjb252ZXJ0IGJvdGggYml0 bWFwcyBpbnRvIGENCiAgc2luZ2xlIGJpdG1hcCB0aGF0IGlzIHNoYXJlZCBieSBib3RoIGtlcm5l bCBjb21wb25lbnRzIGFuZCB0aGF0IGV4aXN0cyBlLmcuIGF0DQogIHRoZSByZXF1ZXN0IHF1ZXVl IGxldmVsPw0KDQpUaGFua3MsDQoNCkJhcnQu