From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from esa4.hgst.iphmx.com ([216.71.154.42]:6594 "EHLO esa4.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753814AbdIDQTU (ORCPT ); Mon, 4 Sep 2017 12:19:20 -0400 From: Bart Van Assche To: "ming.lei@redhat.com" CC: "linux-block@vger.kernel.org" , "hch@infradead.org" , "jthumshirn@suse.de" , "martin.petersen@oracle.com" , "linux-scsi@vger.kernel.org" , "axboe@fb.com" , "oleksandr@natalenko.name" , "jejb@linux.vnet.ibm.com" , "tj@kernel.org" Subject: Re: [PATCH V3 7/8] block: allow to allocate req with REQF_PREEMPT when queue is preempt frozen Date: Mon, 4 Sep 2017 16:18:32 +0000 Message-ID: <1504541911.3189.18.camel@wdc.com> References: <20170902130840.24609-1-ming.lei@redhat.com> <20170902130840.24609-8-ming.lei@redhat.com> <20170902131208.GA10940@ming.t460p> <1504498405.10804.10.camel@wdc.com> <20170904071653.GD7959@ming.t460p> <1504539634.3189.15.camel@wdc.com> <20170904160813.GA21757@ming.t460p> In-Reply-To: <20170904160813.GA21757@ming.t460p> Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Sender: linux-block-owner@vger.kernel.org List-Id: linux-block@vger.kernel.org T24gVHVlLCAyMDE3LTA5LTA1IGF0IDAwOjA4ICswODAwLCBNaW5nIExlaSB3cm90ZToNCj4gT24g TW9uLCBTZXAgMDQsIDIwMTcgYXQgMDM6NDA6MzVQTSArMDAwMCwgQmFydCBWYW4gQXNzY2hlIHdy b3RlOg0KPiA+IE9uIE1vbiwgMjAxNy0wOS0wNCBhdCAxNToxNiArMDgwMCwgTWluZyBMZWkgd3Jv dGU6DQo+ID4gPiBPbiBNb24sIFNlcCAwNCwgMjAxNyBhdCAwNDoxMzoyNkFNICswMDAwLCBCYXJ0 IFZhbiBBc3NjaGUgd3JvdGU6DQo+ID4gPiA+IEFsbG93aW5nIGJsa19nZXRfcmVxdWVzdCgpIHRv IHN1Y2NlZWQgYWZ0ZXIgdGhlIERZSU5HIGZsYWcgaGFzIGJlZW4gc2V0IGlzDQo+ID4gPiA+IGNv bXBsZXRlbHkgd3JvbmcgYmVjYXVzZSB0aGF0IGNvdWxkIHJlc3VsdCBpbiBhIHJlcXVlc3QgYmVp bmcgcXVldWVkIGFmdGVyDQo+ID4gPiA+IHRoZSBERUFEIGZsYWcgaGFzIGJlZW4gc2V0LCByZXN1 bHRpbmcgaW4gZWl0aGVyIGEgaGFuZ2luZyByZXF1ZXN0IG9yIGEga2VybmVsDQo+ID4gPiA+IGNy YXNoLiBUaGlzIGlzIHdoeSBpdCdzIGNvbXBsZXRlbHkgd3JvbmcgdG8gYWRkIGEgYmxrX3F1ZXVl X2VudGVyX2xpdmUoKSBjYWxsDQo+ID4gPiA+IGluIGJsa19vbGRfZ2V0X3JlcXVlc3QoKSBvciBi bGtfbXFfYWxsb2NfcmVxdWVzdCgpLiBIZW5jZSBteSBOQUsgZm9yIGFueQ0KPiA+ID4gPiBwYXRj aCB0aGF0IGFkZHMgYSBibGtfcXVldWVfZW50ZXJfbGl2ZSgpIGNhbGwgdG8gYW55IGZ1bmN0aW9u IGNhbGxlZCBmcm9tDQo+ID4gPiA+IGJsa19nZXRfcmVxdWVzdCgpLiBUaGF0IGluY2x1ZGVzIHRo ZSBwYXRjaCBhdCB0aGUgc3RhcnQgb2YgdGhpcyBlLW1haWwgdGhyZWFkLg0KPiA+ID4gDQo+ID4g PiBTZWUgYWJvdmUsIHRoaXMgcGF0Y2ggY2hhbmdlcyBub3RoaW5nIGFib3V0IHRoaXMgZmFjdCwg cGxlYXNlIGxvb2sgYXQNCj4gPiA+IHRoZSBwYXRjaCBjYXJlZnVsbHkgbmV4dCB0aW1lIGp1c3Qg YmVmb3JlIHBvc3RpbmcgeW91ciBsb25nIGNvbW1lbnQuDQo+ID4gDQo+ID4gQXJlIHlvdSByZWFs bHkgc3VyZSB0aGF0IHlvdXIgcGF0Y2ggZG9lcyBub3QgYWxsb3cgYmxrX2dldF9yZXF1ZXN0KCkg dG8NCj4gPiBzdWNjZWVkIGFmdGVyIHRoZSBEWUlORyBmbGFnIGhhcyBiZWVuIHNldD8gYmxrX21x X2FsbG9jX3JlcXVlc3QoKSBjYWxscyBib3RoDQo+ID4gYmxrX3F1ZXVlX2lzX3ByZWVtcHRfZnJv emVuKCkgYW5kIGJsa19xdWV1ZV9lbnRlcl9saXZlKCkgd2l0aG91dCBob2xkaW5nDQo+ID4gYW55 IGxvY2suIEEgdGhyZWFkIHRoYXQgaXMgcnVubmluZyBjb25jdXJyZW50bHkgd2l0aCBibGtfbXFf Z2V0X3JlcXVlc3QoKQ0KPiA+IGNhbiB1bmZyZWV6ZSB0aGUgcXVldWUgYWZ0ZXIgYmxrX3F1ZXVl X2lzX3ByZWVtcHRfZnJvemVuKCkgcmV0dXJuZWQgYW5kDQo+ID4gYmVmb3JlIGJsa19xdWV1ZV9l bnRlcl9saXZlKCkgaXMgY2FsbGVkLiBUaGlzIG1lYW5zIHRoYXQgd2l0aCB5b3VyIHBhdGNoDQo+ ID4gc2VyaWVzIGFwcGxpZWQgYmxrX2dldF9yZXF1ZXN0KCkgY2FuIHN1Y2NlZWQgYWZ0ZXIgdGhl IERZSU5HIGZsYWcgaGFzIGJlZW4NCj4gPiBzZXQsIHdoaWNoIGlzIHNvbWV0aGluZyB3ZSBkb24n dCB3YW50LiBBZGRpdGlvbmFsbHksIEkgZG9uJ3QgdGhpbmsgd2Ugd2FudA0KPiA+IHRvIGludHJv ZHVjZSBhbnkga2luZCBvZiBsb2NraW5nIGluIGJsa19tcV9nZXRfcmVxdWVzdCgpIGJlY2F1c2Ug dGhhdCB3b3VsZA0KPiA+IGJlIGEgc2VyaWFsaXphdGlvbiBwb2ludC4NCj4NCj4gWWVhaCwgSSBh bSBwcmV0dHkgc3VyZS4NCj4gDQo+IEZpcnN0bHkgYmxrX3F1ZXVlX2ZyZWV6ZV9wcmVlbXB0KCkg aXMgZXhjbHVzaXZlLCB0aGF0IG1lYW5zIGl0IHdpbGwgd2FpdA0KPiBmb3IgY29tcGxldGlvbiBv ZiBhbGwgcGVuZGluZyBmcmVlemluZyhib3RoIG5vcm1hbCBhbmQgcHJlZW1wdCksIGFuZCBvdGhl cg0KPiBmcmVlemluZyBjYW4ndCBiZSBzdGFydGVkIHRvbyBpZiB0aGVyZSBpcyBpbi1wcm9ncmVz cyBwcmVlbXB0DQo+IGZyZWV6aW5nLCBhY3R1YWxseSBpdCBpcyBhIHR5cGljYWwgcmVhZC93cml0 ZSBsb2NrIHVzZSBjYXNlLCBidXQNCj4gd2UgbmVlZCB0byBzdXBwb3J0IG5lc3RlZCBub3JtYWwg ZnJlZXppbmcsIHNvIHdlIGNhbid0IHVzZSByd3NlbS4gDQoNCllvdSBzZWVtIHRvIG92ZXJsb29r IHRoYXQgYmxrX2dldF9yZXF1ZXN0KCkgY2FuIGJlIGNhbGxlZCBmcm9tIGFub3RoZXIgdGhyZWFk DQp0aGFuIHRoZSB0aHJlYWQgdGhhdCBpcyBwZXJmb3JtaW5nIHRoZSBmcmVlemluZyBhbmQgdW5m cmVlemluZy4NCg0KQmFydC4=