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Petersen" , Evan Green , Janek Kotas , Stanley Chu , Bean Huo , Subhash Jadavani , Arnd Bergmann , Bjorn Andersson , open list Subject: RE: [PATCH v1 1/1] scsi: ufs: Add command logging infrastructure Thread-Topic: [PATCH v1 1/1] scsi: ufs: Add command logging infrastructure Thread-Index: AQHViWLhprkG394+5UW4GUZ9ZO/s2adn01AAgAAzmCA= Date: Wed, 23 Oct 2019 10:33:10 +0000 Message-ID: References: <1571808560-3965-1-git-send-email-cang@codeaurora.org> <5B8DA87D05A7694D9FA63FD143655C1B9DCF0AFE@hasmsx108.ger.corp.intel.com> In-Reply-To: <5B8DA87D05A7694D9FA63FD143655C1B9DCF0AFE@hasmsx108.ger.corp.intel.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Avri.Altman@wdc.com; x-originating-ip: [212.25.79.133] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: c71b6ac6-c8a8-49f9-524a-08d757a466c8 x-ms-traffictypediagnostic: MN2PR04MB6991: x-microsoft-antispam-prvs: wdcipoutbound: EOP-TRUE x-ms-oob-tlc-oobclassifiers: OLM:8273; x-forefront-prvs: 019919A9E4 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(4636009)(346002)(366004)(39860400002)(396003)(136003)(376002)(199004)(189003)(2201001)(81166006)(81156014)(25786009)(4744005)(66946007)(8936002)(476003)(186003)(256004)(71200400001)(486006)(71190400001)(446003)(14444005)(3846002)(52536014)(2906002)(6116002)(8676002)(66556008)(66446008)(66476007)(64756008)(11346002)(86362001)(55016002)(33656002)(5660300002)(9686003)(76116006)(99286004)(478600001)(7416002)(110136005)(54906003)(6246003)(7736002)(4326008)(305945005)(6436002)(316002)(26005)(66066001)(74316002)(6506007)(14454004)(2501003)(76176011)(7696005)(102836004)(229853002)(921003)(1121003);DIR:OUT;SFP:1102;SCL:1;SRVR:MN2PR04MB6991;H:MN2PR04MB6991.namprd04.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: vKW+kisKbnFR427rlDim/ToXELoye9A7I/0YCmH/RLBjTHk4iLEKqPUMhBkM6SKMt4gf3v/dFQFf3LwAd0kgfM8PrKz+W1rZ+UnCblU03qnGVLYcUfLVJ9or6zJwW8I7hopJ4u8A/92eEVoSnNESkm3E2SRQ5ZOO7Sp10+/pxRZ4C/3eoBdfLdgsKN1spiShiPBJf/8Q/Z2ve3R6pQWC1sndZK5XuXigpXwx8Q6LUWElTz4OTnwg0UZJzDXwmzgBMiMOB4uqLUjADXlulWI+9Jg3Im/3P1N+AvceJvfgNI04vFxiRixTgxBb+JXbFWZsqzhI5OFmD4ncyqEE5PQPS0UuC/tWWa2Qh4rMtOzsePemEBM5N82qzuUIIQcwAS1NQbjsEixQ07tLS4gi/2+oJkO5fIIyM7u/6t2Q5mnJPT/q6KML86YRm6o+Nq32qBqJ x-ms-exchange-transport-forked: True Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-Network-Message-Id: c71b6ac6-c8a8-49f9-524a-08d757a466c8 X-MS-Exchange-CrossTenant-originalarrivaltime: 23 Oct 2019 10:33:10.4741 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: omN+G7DuKEzDYA4oLbYXYvTFqyjfqgYTQ+tDFvl1do4FYc2h+HBf4oav/ibxy5kKrwJFXlcQUg0cPdzIsEwqhw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR04MB6991 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org =20 >=20 > > Add the necessary infrastructure to keep timestamp history of > > commands, events and other useful info for debugging complex issues. > > This helps in diagnosing events leading upto failure. >=20 > Why not use tracepoints, for that? Ack on Tomas's comment. Are there any pieces of information that you need not provided by the upiu = tracer? Thanks, Avri