From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from esa2.hgst.iphmx.com ([68.232.143.124]:62481 "EHLO esa2.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751313AbdK0ROu (ORCPT ); Mon, 27 Nov 2017 12:14:50 -0500 From: Bart Van Assche To: "dm-devel@redhat.com" , "linux-block@vger.kernel.org" , "axboe@fb.com" , "ming.lei@redhat.com" , "snitzer@redhat.com" CC: "hch@infradead.org" , "linux-kernel@vger.kernel.org" , "hare@suse.com" , "osandov@fb.com" Subject: Re: [PATCH V2 1/5] dm-mpath: don't call blk_mq_delay_run_hw_queue() in case of BLK_STS_RESOURCE Date: Mon, 27 Nov 2017 17:14:46 +0000 Message-ID: <1511802882.2993.4.camel@wdc.com> References: <20171127050721.5884-1-ming.lei@redhat.com> <20171127050721.5884-2-ming.lei@redhat.com> In-Reply-To: <20171127050721.5884-2-ming.lei@redhat.com> 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 T24gTW9uLCAyMDE3LTExLTI3IGF0IDEzOjA3ICswODAwLCBNaW5nIExlaSB3cm90ZToNCj4gSWYg LnF1ZXVlX3JxKCkgcmV0dXJucyBCTEtfU1RTX1JFU09VUkNFLCBibGstbXEgd2lsbCByZXJ1biB0 aGUgcXVldWUgaW4NCj4gdGhlIHRocmVlIHNpdHVhdGlvbnM6DQo+IA0KPiAxKSBpZiBCTEtfTVFf U19TQ0hFRF9SRVNUQVJUIGlzIHNldA0KPiAtIHF1ZXVlIGlzIHJlcnVuIGFmdGVyIG9uZSBycSBp cyBjb21wbGV0ZWQsIHNlZSBibGtfbXFfc2NoZWRfcmVzdGFydCgpDQo+IHdoaWNoIGlzIHJ1biBm cm9tIGJsa19tcV9mcmVlX3JlcXVlc3QoKQ0KPiANCj4gMikgcnVuIG91dCBvZiBkcml2ZXIgdGFn DQo+IC0gcXVldWUgaXMgcmVydW4gYWZ0ZXIgb25lIHRhZyBpcyBmcmVlZA0KPiANCj4gMykgb3Ro ZXJ3aXNlDQo+IC0gcXVldWUgaXMgcnVuIGltbWVkaWF0ZWx5IGluIGJsa19tcV9kaXNwYXRjaF9y cV9saXN0KCkNCj4gDQo+IFRoaXMgcmFuZG9tIGRlYWx5IG9mIHJ1bm5pbmcgaHcgcXVldWUgaXMg aW50cm9kdWNlZCBieSBjb21taXQgNjA3N2MyZDcwNjA5N2MwDQo+IChkbSBycTogQXZvaWQgdGhh dCByZXF1ZXN0IHByb2Nlc3Npbmcgc3RhbGxzIHNwb3JhZGljYWxseSksIHdoaWNoIGNsYWltZWQN Cj4gb25lIHJlcXVlc3QgcHJvY2Vzc2luZyBzdGFsbGluZyBpcyBmaXhlZCwgYnV0IG5ldmVyIGV4 cGxhaW5lZCB0aGUgYmVoaW5kDQo+IGlkZWEsIGFuZCBpdCBpcyBhIHdvcmthb3VuZCBhdCBtb3N0 LiBFdmVuIHRoZSBxdWVzdGlvbiBpc24ndCBleHBsYWluZWQgYnkNCj4gYW55b25lIGluIHJlY2Vu dCBkaXNjdXNzaW9uLg0KPiANCj4gQWxzbyBjYWxsaW5nIGJsa19tcV9kZWxheV9ydW5faHdfcXVl dWUoKSBpbnNpZGUgLnF1ZXVlX3JxKCkgaXMgYSBob3JyaWJsZQ0KPiBoYWNrIGJlY2F1c2UgaXQg bWFrZXMgQkxLX01RX1NfU0NIRURfUkVTVEFSVCBub3Qgd29ya2luZywgYW5kIGRlZ3JhZGVzIEkv Tw0KPiBwZWZvcm1hbmNlIGEgbG90Lg0KPiANCj4gRmluYWxseSB0aGlzIHBhdGNoIG1ha2VzIHN1 cmUgdGhhdCBkbS1ycSByZXR1cm5zIEJMS19TVFNfUkVTT1VSQ0UgdG8gYmxrLW1xDQo+IG9ubHkg d2hlbiB1bmRlcmx5aW5nIHF1ZXVlIGlzIG91dCBvZiByZXNvdXJjZSwgc28gd2Ugc3dpdGNoIHRv IHJldHVybg0KPiBETV9NQVBJT19ERUxBWV9SRVFVRVUgaWYgZWl0aGVyIE1QQVRIRl9RVUVVRV9J TyBvciBNUEFUSEZfUEdfSU5JVF9SRVFVSVJFRA0KPiBpcyBzZXQgaW4gbXVsdGlwYXRoX2Nsb25l X2FuZF9tYXAoKS4NCg0KU29ycnkgYnV0IGluIG15IG9waW5pb24gdGhlIGFib3ZlIGRlc2NyaXB0 aW9uIHNob3dzIHRoYXQgeW91IGRvbid0IHVuZGVyc3RhbmQNCnRoZSBkbS1tcGF0aCBkcml2ZXIg Y29tcGxldGVseS4NCg0KPiBkaWZmIC0tZ2l0IGEvZHJpdmVycy9tZC9kbS1tcGF0aC5jIGIvZHJp dmVycy9tZC9kbS1tcGF0aC5jDQo+IGluZGV4IGM4ZmFhMmI4NTg0Mi4uOGZlM2Y0NTQwN2NlIDEw MDY0NA0KPiAtLS0gYS9kcml2ZXJzL21kL2RtLW1wYXRoLmMNCj4gKysrIGIvZHJpdmVycy9tZC9k bS1tcGF0aC5jDQo+IEBAIC00ODQsOSArNDg0LDcgQEAgc3RhdGljIGludCBtdWx0aXBhdGhfY2xv bmVfYW5kX21hcChzdHJ1Y3QgZG1fdGFyZ2V0ICp0aSwgc3RydWN0IHJlcXVlc3QgKnJxLA0KPiAg CQlyZXR1cm4gRE1fTUFQSU9fS0lMTDsNCj4gIAl9IGVsc2UgaWYgKHRlc3RfYml0KE1QQVRIRl9R VUVVRV9JTywgJm0tPmZsYWdzKSB8fA0KPiAgCQkgICB0ZXN0X2JpdChNUEFUSEZfUEdfSU5JVF9S RVFVSVJFRCwgJm0tPmZsYWdzKSkgew0KPiAtCQlpZiAocGdfaW5pdF9hbGxfcGF0aHMobSkpDQo+ IC0JCQlyZXR1cm4gRE1fTUFQSU9fREVMQVlfUkVRVUVVRTsNCj4gLQkJcmV0dXJuIERNX01BUElP X1JFUVVFVUU7DQo+ICsJCXJldHVybiBETV9NQVBJT19ERUxBWV9SRVFVRVVFOw0KPiAgCX0NCg0K VGhpcyBwYXRjaCByZW1vdmVzIGEgcGdfaW5pdF9hbGxfcGF0aHMoKSBjYWxsIGJ1dCB5b3UgZG9u J3QgZXhwbGFpbiB3aHkgeW91DQp0aGluayBpdCBpcyBhbGxvd2VkIHRvIHJlbW92ZSB0aGF0IGNh bGwuIERpZCB5b3UgcGVyaGFwcyByZW1vdmUgdGhhdCBjYWxsIGJ5DQptaXN0YWtlPw0KDQpCYXJ0 Lg==