Re: [PATCH V3 06/14] blk-mq-sched: don't dequeue request until all in ->dispatch are flushed
From: Bart Van Assche <hidden>
Date: 2017-08-31 21:01:07
T24gVGh1LCAyMDE3LTA4LTMxIGF0IDEyOjAxICswODAwLCBNaW5nIExlaSB3cm90ZToNCj4gT24g V2VkLCBBdWcgMzAsIDIwMTcgYXQgMDU6MTE6MDBQTSArMDAwMCwgQmFydCBWYW4gQXNzY2hlIHdy b3RlOg0KPiA+IE9uIFN1biwgMjAxNy0wOC0yNyBhdCAwMDozMyArMDgwMCwgTWluZyBMZWkgd3Jv dGU6DQo+ID4gWyAuLi4gXQ0KPiA+IFNob3VsZG4ndCBibGtfbXFfc2NoZWRfZGlzcGF0Y2hfcmVx dWVzdHMoKSBzZXQgQkxLX01RX1NfRElTUEFUQ0hfQlVTWSBqdXN0IGFmdGVyDQo+ID4gdGhlIGZv bGxvd2luZyBzdGF0ZW1lbnQgYmVjYXVzZSB0aGlzIHN0YXRlbWVudCBtYWtlcyB0aGUgZGlzcGF0 Y2ggbGlzdCBlbXB0eT8NCj4gDQo+IEFjdHVhbGx5IHRoYXQgaXMgd2hhdCBJIGRpZCBpbiBWMS4N Cj4gDQo+IEkgY2hhbmdlZCB0byB0aGlzIHdheSBiZWNhdXNlIHNldHRpbmcgdGhlIEJVU1kgZmxh ZyBoZXJlIHdpbGwgaW5jcmVhc2UNCj4gdGhlIHJhY2Ugd2luZG93IGEgYml0LCBmb3IgZXhhbXBs ZSwgaWYgb25lIHJlcXVlc3QgaXMgYWRkZWQgdG8gLT5kaXNwYXRjaA0KPiBqdXN0IGFmdGVyIGl0 IGlzIGZsdXNoZWQoKSwgdGhlIGNoZWNrIG9uIHRoZSBCVVNZIGJpdCB3b24ndCBjYXRjaCB0aGlz DQo+IGNhc2UuIFRoZW4gd2UgY2FuIGF2b2lkIHRvIGNoZWNrIGJvdGggdGhlIGJpdCBhbmQgbGlz dF9lbXB0eV9jYXJlZnVsKCZoY3R4LT5kaXNwYXRjaCkNCj4gaW4gYmxrX21xX3NjaGVkX2Rpc3Bh dGNoX3JlcXVlc3RzKCksIHNvIGNvZGUgYmVjb21lcyBzaW1wbGVyIGFuZCBtb3JlDQo+IHJlYWRh YmxlIGlmIHdlIHNldCB0aGUgZmxhZyBzaW1wbHkgZnJvbSB0aGUgYmVnaW5uaW5nLg0KDQpIZWxs byBNaW5nLA0KDQpNeSB1bmRlcnN0YW5kaW5nIGlzIHRoYXQgYmxrX21xX3NjaGVkX2Rpc3BhdGNo X3JlcXVlc3RzKCkgd2lsbCBvbmx5IHdvcmsNCmNvcnJlY3RseSBpZiB0aGUgY29kZSB0aGF0IHNl dHMgdGhlIERJU1BBVENIX0JVU1kgZmxhZyBkb2VzIHRoYXQgYWZ0ZXIgaGF2aW5nDQppbnNlcnRl ZCBvbmUgb3IgbW9yZSBlbGVtZW50cyBpbiB0aGUgZGlzcGF0Y2ggbGlzdC4gQWx0aG91Z2ggeDg2 IENQVXMgZG8gbm90DQpyZW9yZGVyIHN0b3JlIG9wZXJhdGlvbnMgSSB0aGluayB0aGF0IHRoZSBm dW5jdGlvbnMgdGhhdCBzZXQgdGhlIERJU1BBVENIX0JVU1kNCmZsYWcgbmVlZCBhIG1lbW9yeSBi YXJyaWVyIHRoZXNlIHR3byBzdG9yZSBvcGVyYXRpb25zLiBJJ20gcmVmZXJyaW5nIHRvIHRoZQ0K YmxrX21xX3NjaGVkX2J5cGFzc19pbnNlcnQoKSwgYmxrX21xX2Rpc3BhdGNoX3dhaXRfYWRkKCkg YW5kDQpibGtfbXFfaGN0eF9ub3RpZnlfZGVhZCgpIGZ1bmN0aW9ucy4NCg0KPiA+ID4gKwkJICog dG9vIHNtYWxsLCBubyBuZWVkIHRvIHdvcnJ5IGFib3V0IHBlcmZvcm1hbmNlDQo+ID4gDQo+ID4g ICAgICAgICAgICAgICAgICAgIF5eXg0KPiA+IFRoZSB3b3JkICJ0b28iIHNlZW1zIGV4dHJhbmVv dXMgdG8gbWUgaW4gdGhpcyBzZW50ZW5jZS4NCj4gDQo+IE1heWJlICdleHRyZW1lbHknIGlzIGJl dHRlciwgb3IganVzdCByZW1vdmUgaXQ/DQoNCklmIHRoZSB3b3JkICJ0b28iIHdvdWxkIGJlIHJl bW92ZWQgSSB0aGluayB0aGUgY29tbWVudCBpcyBzdGlsbCBjbGVhci4NCg0KVGhhbmtzLA0KDQpC YXJ0Lg==