From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Bart Van Assche To: "snitzer@redhat.com" , "axboe@kernel.dk" CC: "hch@lst.de" , "dm-devel@redhat.com" , "linux-block@vger.kernel.org" , "tom.leiming@gmail.com" , "loberman@redhat.com" Subject: Re: [for-4.16 PATCH v6 0/3] blk-mq: improve DM's blk-mq IO merging via blk_insert_cloned_request feedback Date: Wed, 17 Jan 2018 23:31:10 +0000 Message-ID: <1516231868.2820.84.camel@wdc.com> References: <20180117162558.28553-1-snitzer@redhat.com> <45f70a28-aeea-8278-0b8e-9601ea043595@kernel.dk> <20180117165832.GA5573@redhat.com> In-Reply-To: <20180117165832.GA5573@redhat.com> Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 List-ID: T24gV2VkLCAyMDE4LTAxLTE3IGF0IDExOjU4IC0wNTAwLCBNaWtlIFNuaXR6ZXIgd3JvdGU6DQo+ IE9uIFdlZCwgSmFuIDE3IDIwMTggYXQgMTE6NTBhbSAtMDUwMCwNCj4gSmVucyBBeGJvZSA8YXhi b2VAa2VybmVsLmRrPiB3cm90ZToNCj4gDQo+ID4gT24gMS8xNy8xOCA5OjI1IEFNLCBNaWtlIFNu aXR6ZXIgd3JvdGU6DQo+ID4gPiBIaSBKZW5zLA0KPiA+ID4gDQo+ID4gPiBUaGluayB0aGlzIGZp bmFsbHkgdGFrZXMgY2FyZSBvZiBpdCEgOykNCj4gPiA+IA0KPiA+ID4gVGhhbmtzLA0KPiA+ID4g TWlrZQ0KPiA+ID4gDQo+ID4gPiBNaWtlIFNuaXR6ZXIgKDIpOg0KPiA+ID4gICBibGstbXE6IGZh Y3RvciBvdXQgYSBmZXcgaGVscGVycyBmcm9tIF9fYmxrX21xX3RyeV9pc3N1ZV9kaXJlY3RseQ0K PiA+ID4gICBibGstbXEtc2NoZWQ6IHJlbW92ZSB1bnVzZWQgJ2Nhbl9ibG9jaycgYXJnIGZyb20g YmxrX21xX3NjaGVkX2luc2VydF9yZXF1ZXN0DQo+ID4gPiANCj4gPiA+IE1pbmcgTGVpICgxKToN Cj4gPiA+ICAgYmxrLW1xOiBpbXByb3ZlIERNJ3MgYmxrLW1xIElPIG1lcmdpbmcgdmlhIGJsa19p bnNlcnRfY2xvbmVkX3JlcXVlc3QgZmVlZGJhY2sNCj4gPiANCj4gPiBBcHBsaWVkIC0gYWRkZWQg YWN0dWFsIGNvbW1pdCBtZXNzYWdlIHRvIHBhdGNoIDMuDQo+IA0KPiBHcmVhdCwgdGhhbmtzLg0K DQpIZWxsbyBNaWtlLA0KDQpMYXVyZW5jZSBoaXQgdGhlIGZvbGxvd2luZyB3aGlsZSByZXRlc3Rp bmcgdGhlIFNSUCBpbml0aWF0b3IgY29kZToNCg0KWyAyMjIzLjc5NzEyOV0gbGlzdF9hZGQgY29y cnVwdGlvbi4gcHJldi0+bmV4dCBzaG91bGQgYmUgbmV4dCAoMDAwMDAwMDBlMGRkZDVkZCksIGJ1 dCB3YXMgMDAwMDAwMDAzZGVmZTVjZC4gKHByZXY9MDAwMDAwMDAzZGVmZTVjZCkuDQpbIDIyMjMu ODYyMTY4XSBXQVJOSU5HOiBDUFU6IDE0IFBJRDogNTc3IGF0IGxpYi9saXN0X2RlYnVnLmM6Mjgg X19saXN0X2FkZF92YWxpZCsweDZhLzB4NzANClsgMjIyNC40ODExNTFdIENQVTogMTQgUElEOiA1 NzcgQ29tbToga3dvcmtlci8xNDoxSCBUYWludGVkOiBHICAgICAgICAgIEkgICAgICA0LjE1LjAt cmM4LmJhcnQzKyAjMQ0KWyAyMjI0LjUzMTE5M10gSGFyZHdhcmUgbmFtZTogSFAgUHJvTGlhbnQg REwzODAgRzcsIEJJT1MgUDY3IDA4LzE2LzIwMTUNClsgMjIyNC41NjcxNTBdIFdvcmtxdWV1ZTog a2Jsb2NrZCBibGtfbXFfcnVuX3dvcmtfZm4NClsgMjIyNC41OTMxODJdIFJJUDogMDAxMDpfX2xp c3RfYWRkX3ZhbGlkKzB4NmEvMHg3MA0KWyAyMjI0Ljk2NzAwMl0gQ2FsbCBUcmFjZToNClsgMjIy NC45ODA5NDFdICBibGtfbXFfcmVxdWVzdF9ieXBhc3NfaW5zZXJ0KzB4NTcvMHhhMA0KWyAyMjI1 LjAwOTA0NF0gIF9fYmxrX21xX3RyeV9pc3N1ZV9kaXJlY3RseSsweDU2LzB4MWUwDQpbIDIyMjUu MDM3MDA3XSAgYmxrX21xX3JlcXVlc3RfZGlyZWN0X2lzc3VlKzB4NWQvMHhjMA0KWyAyMjI1LjA5 MDYwOF0gIG1hcF9yZXF1ZXN0KzB4MTQyLzB4MjYwIFtkbV9tb2RdDQpbIDIyMjUuMTE0NzU2XSAg ZG1fbXFfcXVldWVfcnErMHhhNC8weDEyMCBbZG1fbW9kXQ0KWyAyMjI1LjE0MDgxMl0gIGJsa19t cV9kaXNwYXRjaF9ycV9saXN0KzB4OTAvMHg1YjANClsgMjIyNS4yMTE3NjldICBibGtfbXFfc2No ZWRfZGlzcGF0Y2hfcmVxdWVzdHMrMHgxMDcvMHgxYTANClsgMjIyNS4yNDA4MjVdICBfX2Jsa19t cV9ydW5faHdfcXVldWUrMHg1Zi8weGYwDQpbIDIyMjUuMjY0ODUyXSAgcHJvY2Vzc19vbmVfd29y aysweDE0MS8weDM0MA0KWyAyMjI1LjI4Nzg3Ml0gIHdvcmtlcl90aHJlYWQrMHg0Ny8weDNlMA0K WyAyMjI1LjMwODM1NF0gIGt0aHJlYWQrMHhmNS8weDEzMA0KWyAyMjI1LjM5NjQwNV0gIHJldF9m cm9tX2ZvcmsrMHgzMi8weDQwDQoNClRoYXQgY2FsbCB0cmFjZSBkaWQgbm90IHNob3cgdXAgYmVm b3JlIHRoaXMgcGF0Y2ggc2VyaWVzIHdhcyBhZGRlZCB0byBKZW5zJw0KdHJlZS4gVGhpcyBpcyBh IHJlZ3Jlc3Npb24uIENvdWxkIHRoaXMgaGF2ZSBiZWVuIGludHJvZHVjZWQgYnkgdGhpcyBwYXRj aA0Kc2VyaWVzPw0KDQpUaGFua3MsDQoNCkJhcnQu