From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Bart Van Assche To: "hch@lst.de" CC: "linux-kernel@vger.kernel.org" , "linux-block@vger.kernel.org" , "israelr@mellanox.com" , "sagi@grimberg.me" , "sebott@linux.ibm.com" , "axboe@kernel.dk" , "ming.lei@redhat.com" , "jianchao.w.wang@oracle.com" , "maxg@mellanox.com" , "tj@kernel.org" Subject: Re: [PATCH v9 2/2] blk-mq: Rework blk-mq timeout handling again Date: Wed, 16 May 2018 16:47:54 +0000 Message-ID: References: <20180515225124.20428-1-bart.vanassche@wdc.com> <20180515225124.20428-6-bart.vanassche@wdc.com> <20180516125110.GA32078@lst.de> <8058d72fef475caffa78c962bc4220f5f8fa3dde.camel@wdc.com> <20180516162432.GA4398@lst.de> In-Reply-To: <20180516162432.GA4398@lst.de> Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 List-ID: T24gV2VkLCAyMDE4LTA1LTE2IGF0IDE4OjI0ICswMjAwLCBoY2hAbHN0LmRlIHdyb3RlOg0KPiBP biBXZWQsIE1heSAxNiwgMjAxOCBhdCAwNDoxNzo0MlBNICswMDAwLCBCYXJ0IFZhbiBBc3NjaGUg d3JvdGU6DQo+ID4gVGhlcmUgaXMgYW5vdGhlciByZWFzb24gdGhlIGRlYWRsaW5lIGlzIGluY2x1 ZGVkIGluIHRoZSBhdG9taWMgb3BlcmF0aW9uLA0KPiA+IG5hbWVseSB0byBoYW5kbGUgcmFjZXMg YmV0d2VlbiB0aGUgQkxLX0VIX1JFU0VUX1RJTUVSIGNhc2UgaW4gYmxrX21xX3JxX3RpbWVkX291 dCgpDQo+ID4gYW5kIGJsa19tcV9jb21wbGV0ZV9yZXF1ZXN0KCkuIEkgZG9uJ3QgdGhpbmsgdGhh dCByYWNlIGlzIGFkZHJlc3NlZCBwcm9wZXJseSBieQ0KPiA+IHlvdXIgcGF0Y2guIEkgd2lsbCBz ZWUgd2hhdCBJIGNhbiBkbyB0byBhZGRyZXNzIHRoYXQgcmFjZSB3aXRob3V0IHVzaW5nIDY0LWJp dA0KPiA+IGF0b21pYyBvcGVyYXRpb25zLg0KPiANCj4gSSBtaWdodCBiZSBtaXNzaW5nIHNvbWV0 aGluZyBoZXJlLCBzbyBwbGVhc2UgaGVscCBtZSB1bmRlcnN0YW5kDQo+IHdoYXQgaXMgbWlzc2lu Zy4NCj4gDQo+IElmIHdlIHJlc3RhcnQgdGhlIHRpbWVyIGluIGJsa19tcV9ycV90aW1lZF9vdXQg d2UgYWxzbyBidW1wIHRoZQ0KPiBnZW5lcmF0aW9uIGF0IHRoZSBzYW1lIHRpbWUgYXMgd2UgcmVz ZXQgdGhlIGRlYWRsaW5lIGluIHlvdXIgb2xkDQo+IHBhdGNoLiAgV2l0aCB0aGlzIHBhdGNoIHdl IG9ubHkgYnVtcCB0aGUgZ2VuZXJhdGlvbiwgYnV0IHRoYXQgc2hvdWxkDQo+IGJlIGVub3VnaCB0 byBhZGRyZXNzIHRoZSByZXN0LCBvciBub3Q/DQoNCkhlbGxvIENocmlzdG9waCwNCg0KSSB0aGlu ayB5b3VyIHBhdGNoIGNoYW5nZXMgdGhlIG9yZGVyIG9mIGNoYW5naW5nIHRoZSByZXF1ZXN0IHN0 YXRlIGFuZA0KY2FsbGluZyBtb2RfdGltZXIoKS4gSW4gbXkgcGF0Y2ggdGhlIHJlcXVlc3Qgc3Rh dGUgYW5kIHRoZSBkZWFkbGluZSBhcmUNCnVwZGF0ZWQgZmlyc3QgYW5kIG1vZF90aW1lcigpIGlz IGNhbGxlZCBhZnRlcndhcmRzLiBJIHRoaW5rIHlvdXIgcGF0Y2gNCmNoYW5nZXMgdGhlIG9yZGVy IG9mIHRoZXNlIG9wZXJhdGlvbnMgaW50byB0aGUgZm9sbG93aW5nOg0KKDEpIF9fYmxrX21xX3N0 YXJ0X3JlcXVlc3QoKSBzZXRzIHRoZSByZXF1ZXN0IGRlYWRsaW5lLg0KKDIpIF9fYmxrX21xX3N0 YXJ0X3JlcXVlc3QoKSBjYWxscyBfX2Jsa19hZGRfdGltZXIoKSB3aGljaCBpbiB0dXJuIGNhbGxz DQogICAgbW9kX3RpbWVyKCkuDQooMykgX19ibGtfbXFfc3RhcnRfcmVxdWVzdCgpIGNoYW5nZXMg dGhlIHJlcXVlc3Qgc3RhdGUgaW50byBNUV9SUV9JTl9GTElHSFQuDQoNCkluIHRoZSB1bmxpa2Vs eSBldmVudCBvZiBhIHNpZ25pZmljYW50IGRlbGF5IGJldHdlZW4gKDIpIGFuZCAoMykgaXQgY2Fu DQpoYXBwZW4gdGhhdCB0aGUgdGltZXIgZmlyZXMgYW5kIGV4YW1pbmVzIGFuZCBpZ25vcmVzIHRo ZSByZXF1ZXN0IGJlY2F1c2UNCml0cyBzdGF0ZSBkaWZmZXJzIGZyb20gTVFfUlFfSU5fRkxJR0hU LiBJZiB0aGUgcmVxdWVzdCBmb3Igd2hpY2ggdGhpcw0KaGFwcGVuZWQgdGltZXMgb3V0IGl0cyB0 aW1lb3V0IHdpbGwgb25seSBiZSBoYW5kbGVkIHRoZSBuZXh0IHRpbWUNCmJsa19tcV90aW1lb3V0 X3dvcmsoKSBpcyBjYWxsZWQuIElzIHRoaXMgdGhlIGJlaGF2aW9yIHlvdSBpbnRlbmRlZD8NCg0K VGhhbmtzLA0KDQpCYXJ0Lg0K