From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Bart Van Assche To: "axboe@kernel.dk" , "snitzer@redhat.com" , "ming.lei@redhat.com" CC: "dm-devel@redhat.com" , "hch@infradead.org" , "linux-block@vger.kernel.org" , "axboe@fb.com" , "martin.petersen@oracle.com" Subject: Re: [PATCH V3 0/5] dm-rq: improve sequential I/O performance Date: Thu, 11 Jan 2018 22:37:37 +0000 Message-ID: <1515710256.2752.72.camel@sandisk.com> References: <20180111060159.12991-1-ming.lei@redhat.com> <20180111220742.GA31944@redhat.com> In-Reply-To: <20180111220742.GA31944@redhat.com> Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 List-ID: T24gVGh1LCAyMDE4LTAxLTExIGF0IDE3OjA3IC0wNTAwLCBNaWtlIFNuaXR6ZXIgd3JvdGU6DQo+ IEJhcnQsIGlmIGZvciBzb21lIHJlYXNvbiB3ZSByZWdyZXNzIGZvciBzb21lIHdvcmtsb2FkIHlv dSdyZSBhYmxlIHRvDQo+IG1vcmUgcmVhZGlseSB0ZXN0IHdlIGNhbiBkZWFsIHdpdGggaXQuICBC dXQgSSdtIHRvbyBlbmNvdXJhZ2VkIGJ5IE1pbmcncw0KPiBwZXJmb3JtYW5jZSBpbXByb3ZlbWVu dHMgdG8gaG9sZCB0aGVzZSBjaGFuZ2VzIGJhY2sgYW55IGZ1cnRoZXIuDQoNClNvcnJ5IE1pa2Ug YnV0IEkgdGhpbmsgTWluZydzIG1lYXN1cmVtZW50IHJlc3VsdHMgYXJlIG5vdCBzdWZmaWNpZW50 IHRvDQptb3RpdmF0ZSB1cHN0cmVhbWluZyBvZiB0aGVzZSBwYXRjaGVzLiBXaGF0IEkgcmVtZW1i ZXIgZnJvbSBwcmV2aW91cyB2ZXJzaW9ucw0Kb2YgdGhpcyBwYXRjaCBzZXJpZXMgaXMgdGhhdCBN aW5nIG1lYXN1cmVkIHRoZSBwZXJmb3JtYW5jZSBpbXBhY3Qgb2YgdGhpcw0KcGF0Y2ggc2VyaWVz IG9ubHkgZm9yIHRoZSBFbXVsZXggRkMgZHJpdmVyIChscGZjKS4gVGhhdCBkcml2ZXIgbGltaXRz IHF1ZXVlDQpkZXB0aCB0byAzLiBJbnN0ZWFkIG9mIG1vZGlmeWluZyB0aGUgZG0gY29kZSwgdGhh dCBkcml2ZXIgbmVlZHMgdG8gYmUgZml4ZWQNCnN1Y2ggdGhhdCBpdCBhbGxvd3MgbGFyZ2VyIHF1 ZXVlIGRlcHRocy4NCg0KQWRkaXRpb25hbGx5LCBzb21lIHRpbWUgYWdvIEkgaGFkIGV4cGxhaW5l ZCBpbiBkZXRhaWwgd2h5IEkgdGhpbmsgdGhhdCBwYXRjaA0KMi81IGluIHRoaXMgc2VyaWVzIGlz IHdyb25nIGFuZCB3aHkgaXQgd2lsbCBpbnRyb2R1Y2UgZmFpcm5lc3MgcmVncmVzc2lvbnMNCmlu IG11bHRpLUxVTiB3b3JrbG9hZHMuIEkgdGhpbmsgd2UgbmVlZCBwZXJmb3JtYW5jZSBtZWFzdXJl bWVudHMgZm9yIHRoaXMNCnBhdGNoIHNlcmllcyBmb3IgYXQgbGVhc3QgdGhlIGZvbGxvd2luZyB0 d28gY29uZmlndXJhdGlvbnMgYmVmb3JlIHRoaXMgcGF0Y2gNCnNlcmllcyBjYW4gYmUgY29uc2lk ZXJlZCBmb3IgdXBzdHJlYW0gaW5jbHVzaW9uOg0KKiBUaGUgcGVyZm9ybWFuY2UgaW1wYWN0IG9m IHRoaXMgcGF0Y2ggc2VyaWVzIGZvciBTQ1NJIGRldmljZXMgd2l0aCBhDQogIHJlYWxpc3RpYyBx dWV1ZSBkZXB0aCAoZS5nLiA2NCBvciAxMjgpLg0KKiBUaGUgcGVyZm9ybWFuY2UgaW1wYWN0IGZv ciB0aGlzIHBhdGNoIHNlcmllcyBmb3IgYSBTQ1NJIGhvc3Qgd2l0aCB3aGljaA0KICBtdWx0aXBs ZSBMVU5zIGFyZSBhc3NvY2lhdGVkIGFuZCBmb3Igd2hpY2ggdGhlIHRhcmdldCBzeXN0ZW0gb2Z0 ZW4gcmVwbGllcw0KICB3aXRoIHRoZSBTQ1NJICJCVVNZIiBzdGF0dXMuDQoNCkJhcnQu