From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Bart Van Assche To: "snitzer@redhat.com" CC: "dm-devel@redhat.com" , "linux-kernel@vger.kernel.org" , "hch@infradead.org" , "linux-block@vger.kernel.org" , "osandov@fb.com" , "axboe@kernel.dk" , "ming.lei@redhat.com" Subject: Re: [RFC PATCH] blk-mq: fixup RESTART when queue becomes idle Date: Thu, 18 Jan 2018 22:20:13 +0000 Message-ID: <1516314012.2676.76.camel@wdc.com> References: <20180118170353.GB19734@redhat.com> <1516296056.2676.23.camel@wdc.com> <20180118183039.GA20121@redhat.com> <1516301278.2676.35.camel@wdc.com> <20180118204856.GA31679@redhat.com> <1516309128.2676.38.camel@wdc.com> <20180118212327.GB31679@redhat.com> <1516311554.2676.50.camel@wdc.com> <20180118220132.GA20860@redhat.com> In-Reply-To: <20180118220132.GA20860@redhat.com> Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 List-ID: T24gVGh1LCAyMDE4LTAxLTE4IGF0IDE3OjAxIC0wNTAwLCBNaWtlIFNuaXR6ZXIgd3JvdGU6DQo+ IEFuZCB5ZXQgTGF1cmVuY2UgY2Fubm90IHJlcHJvZHVjZSBhbnkgc3VjaCBsb2NrdXBzIHdpdGgg eW91ciB0ZXN0Li4uDQoNCkhtbSAuLi4gbWF5YmUgSSBtaXN1bmRlcnN0b29kIExhdXJlbmNlIGJ1 dCBJIGRvbid0IHRoaW5rIHRoYXQgTGF1cmVuY2UgaGFzDQphbHJlYWR5IHN1Y2NlZWRlZCBhdCBy dW5uaW5nIGFuIHVubW9kaWZpZWQgdmVyc2lvbiBvZiBteSB0ZXN0cy4gSW4gb25lIG9mIHRoZQ0K ZS1tYWlscyBMYXVyZW5jZSBzZW50IG1lIHRoaXMgbW9ybmluZyBJIHJlYWQgdGhhdCBoZSBtb2Rp ZmllZCB0aGVzZSBzY3JpcHRzDQp0byBnZXQgcGFzdCBhIGtlcm5lbCBtb2R1bGUgdW5sb2FkIGZh aWx1cmUgdGhhdCB3YXMgcmVwb3J0ZWQgd2hpbGUgc3RhcnRpbmcNCnRoZXNlIHRlc3RzLiBTbyB0 aGUgbmV4dCBzdGVwIGlzIHRvIGNoZWNrIHdoaWNoIGNoYW5nZXMgd2VyZSBtYWRlIHRvIHRoZSB0 ZXN0DQpzY3JpcHRzIGFuZCBhbHNvIHdoZXRoZXIgdGhlIHRlc3QgcmVzdWx0cyBhcmUgc3RpbGwg dmFsaWQuDQoNCj4gQXJlIHlvdSBhYnNvbHV0ZWx5IGNlcnRhaW4gdGhpcyBwYXRjaCBkb2Vzbid0 IGhlbHAgeW91Pw0KPiBodHRwczovL3BhdGNod29yay5rZXJuZWwub3JnL3BhdGNoLzEwMTc0MDM3 Lw0KPiANCj4gSWYgaXQgZG9lc24ndCB0aGVuIHRoYXQgaXMgYWN0dWFsbHkgdmVyeSB1c2VmdWwg dG8ga25vdy4NCg0KVGhlIGZpcnN0IEkgdHJpZWQgdGhpcyBtb3JuaW5nIGlzIHRvIHJ1biB0aGUg c3JwLXRlc3Qgc29mdHdhcmUgYWdhaW5zdCBhIG1lcmdlDQpvZiBKZW5zJyBmb3ItbmV4dCBicmFu Y2ggYW5kIHlvdXIgZG0tNC4xNiBicmFuY2guIFNpbmNlIEkgbm90aWNlZCB0aGF0IHRoZSBkbQ0K cXVldWUgbG9ja2VkIHVwIEkgcmVpbnNlcnRlZCBhIGJsa19tcV9kZWxheV9ydW5faHdfcXVldWUo KSBjYWxsIGluIHRoZSBkbSBjb2RlLg0KU2luY2UgZXZlbiB0aGF0IHdhcyBub3Qgc3VmZmljaWVu dCBJIHRyaWVkIHRvIGtpY2sgdGhlIHF1ZXVlcyB2aWEgZGVidWdmcyAoZm9yDQpzIGluIC9zeXMv a2VybmVsL2RlYnVnL2Jsb2NrLyovc3RhdGU7IGRvIGVjaG8ga2ljayA+JHM7IGRvbmUpLiBTaW5j ZSB0aGF0IHdhcw0Kbm90IHN1ZmZpY2llbnQgdG8gcmVzb2x2ZSB0aGUgcXVldWUgc3RhbGwgSSBy ZXZlcnRlZCB0aGUgZm9sbG93aW5nIHRyZWUgcGF0Y2hlcw0KdGhhdCBhcmUgaW4gSmVucycgdHJl ZToNCiogImJsay1tcTogaW1wcm92ZSBETSdzIGJsay1tcSBJTyBtZXJnaW5nIHZpYSBibGtfaW5z ZXJ0X2Nsb25lZF9yZXF1ZXN0IGZlZWRiYWNrIg0KKiAiYmxrLW1xLXNjaGVkOiByZW1vdmUgdW51 c2VkICdjYW5fYmxvY2snIGFyZyBmcm9tIGJsa19tcV9zY2hlZF9pbnNlcnRfcmVxdWVzdCINCiog ImJsay1tcTogZG9uJ3QgZGlzcGF0Y2ggcmVxdWVzdCBpbiBibGtfbXFfcmVxdWVzdF9kaXJlY3Rf aXNzdWUgaWYgcXVldWUgaXMgYnVzeSINCg0KT25seSBhZnRlciBJIGhhZCBkb25lIHRoaXMgdGhl IHNycC10ZXN0IHNvZnR3YXJlIHJhbiBhZ2FpbiB3aXRob3V0IHRyaWdnZXJpbmcNCmRtIHF1ZXVl IGxvY2t1cHMuIFNvcnJ5IGJ1dCBJIGhhdmUgbm90IHlldCBoYWQgdGhlIHRpbWUgdG8gdGVzdCBw YXRjaCAiW1JGQ10NCmJsay1tcTogZml4dXAgUkVTVEFSVCB3aGVuIHF1ZXVlIGJlY29tZXMgaWRs ZSIuDQoNCj4gUGxlYXNlIGp1c3QgZm9jdXMgb24gaGVscGluZyBMYXVyZW5jZSBnZXQgaGlzIHZl cnkgY2FwYWJsZSB0ZXN0YmVkIHRvDQo+IHJlcHJvZHVjZSB0aGlzIGlzc3VlLiAgT25jZSB3ZSBj YW4gcmVwcm9kdWNlIHRoZXNlICJ1bmtpbGxhYmxlIiAic3RhbGxzIg0KPiBpbi1ob3VzZSBpdCds bCBiZSBfbXVjaF8gZWFzaWVyIHRvIGFuYWx5emUgYW5kIGZpeC4NCg0KT0ssIEkgd2lsbCB3b3Jr IHdpdGggTGF1cmVuY2Ugb24gdGhpcy4gTWF5YmUgTGF1cmVuY2UgYW5kIEkgc2hvdWxkIHdvcmsg b24gdGhpcw0KYmVmb3JlIGFuYWx5emluZyB0aGUgbG9ja3VwIHRoYXQgd2FzIG1lbnRpb25lZCBh Ym92ZSBmdXJ0aGVyPw0KDQpCYXJ0Lg==