Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Nadav Amit <namit@vmware.com>
To:     Matthew Wilcox <willy@infradead.org>
CC:     Ajay Kaher <akaher@vmware.com>, Bjorn Helgaas <helgaas@kernel.org>,
        "bhelgaas@google.com" <bhelgaas@google.com>,
        "tglx@linutronix.de" <tglx@linutronix.de>,
        "mingo@redhat.com" <mingo@redhat.com>,
        "bp@alien8.de" <bp@alien8.de>,
        "dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
        "x86@kernel.org" <x86@kernel.org>, "hpa@zytor.com" <hpa@zytor.com>,
        "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "rostedt@goodmis.org" <rostedt@goodmis.org>,
        Srivatsa Bhat <srivatsab@vmware.com>,
        "srivatsa@csail.mit.edu" <srivatsa@csail.mit.edu>,
        Alexey Makhalov <amakhalov@vmware.com>,
        Anish Swaminathan <anishs@vmware.com>,
        Vasavi Sirnapalli <vsirnapalli@vmware.com>,
        "er.ajay.kaher@gmail.com" <er.ajay.kaher@gmail.com>
Subject: Re: [PATCH] MMIO should have more priority then IO
Thread-Topic: [PATCH] MMIO should have more priority then IO
Thread-Index: AQHYiw9NzqWSNRsR1kyxPrXhcjObWa1lHkCAgA7qdoCAAHWQAIAAP7qAgAATwgCAAAszgA==
Date:   Fri, 8 Jul 2022 18:35:48 +0000
Message-ID: <1A0FA5B7-39E8-4CAE-90DD-E260937F14E1@vmware.com>
References: <1656433761-9163-1-git-send-email-akaher@vmware.com>
 <20220628180919.GA1850423@bhelgaas>
 <25F843ED-7EB4-4D00-96CB-7DE1AC886460@vmware.com>
 <YsgplrrJnk5Ly19z@casper.infradead.org>
 <96D533E5-F3AF-4062-B095-8C143C307E37@vmware.com>
 <YshvnodeqmJV6uIJ@casper.infradead.org>
In-Reply-To: <YshvnodeqmJV6uIJ@casper.infradead.org>
Accept-Language: en-US
Content-Language: en-US
x-ms-exchange-antispam-messagedata-chunkcount: 1
x-ms-exchange-antispam-messagedata-0: =?utf-8?B?T1BoVEE1T1JKN3hIWVh4STNURnpHM0kzSGMxMUg1WDk0cGJhTVBDei96czdz?=
 =?utf-8?B?dThEZHhWOUJsb2tqRjRVcVhodzhsa3oveUl3SytxSGFvcisrb3QzTHYxazJ5?=
 =?utf-8?B?RGt2OVBQd3dDelBSK2hIeW5ZckFMZkNZcVZVVUl0Y01EWVZta081V2pLczkx?=
 =?utf-8?B?T3VZMXFRaldTai9oQUFPL2x3VTJQNkpUYVZ1QnZ5N2xuU3Zpc3NvUjF5TVBw?=
 =?utf-8?B?c0JxYmpoTUZmNzgxY2NCYkNEcmdKZU53Y1pEdW95MThMalZUNEl5MTc1WTNa?=
 =?utf-8?B?VGQ5b05oMVlPMkRaR2xqQUJQSWZqMFdTZjlvdkt0b0cyKzA1MDdFUlF6T1pq?=
 =?utf-8?B?MVQ5Z2daRXJ4VVlhenl5L3VJV0F6cWw4Nm1aaVpjSnpPWllhTUJKN2FRc3Fa?=
 =?utf-8?B?aHpmaUZUNUFHRHFyOFlZVGR4UUtUaCs5emRkT1VmL2UyZGhQOElsbUlEbmlY?=
 =?utf-8?B?dHNWTWRGK2J1Nm9TWDkydllhNUcxaFhmdjdQNmkxa1E5aUJPYTFZWWcvd3do?=
 =?utf-8?B?dElTT2VlR3ZqYUJVb0VhQ0ZyeGxWSklVbW1YemM2VmdpSGJySjJIaHB5VEhY?=
 =?utf-8?B?Mm8ySHhZOFgyOUdYdTBmUUREZDA1MEdGdmVGSXZOUzNMd05XNE40TktVYmk5?=
 =?utf-8?B?K1BDeWxCcTZpZlcyc3ZmUWNGS1FDbHBvclg5T3N0VlR0U01Gc2dYZnRDYlU1?=
 =?utf-8?B?Y1dRb3ZpN21aN3NqS0lnRU81emNPRDBJNTdzQW5RcDhELzFBWVl4MzJ0ek02?=
 =?utf-8?B?ckk1Y3pTRFo4eUU5bUhnTzVtTmRjUVIreklZV01kNG9lYWpqbkt0WnZRbitX?=
 =?utf-8?B?a2ZqbUNIczlMVFRQTWFyUHFEWlI1ZHJ0dDZreTdEUEhmM1A2NnNUa1dyd0ZI?=
 =?utf-8?B?OUpIVWIvRkprREl5bjdVeFY5dE9RZlBWSUNmNDRZWUREMjcyckNObXVQOTlR?=
 =?utf-8?B?UTRDZzlkaXlrZWxMTmNmaklHTmZ2MCtuWklUWmRZMWVycjlBbEZrUVl4dXZ4?=
 =?utf-8?B?bDJKbE5CUW9sMGJOV3lMdXlHeTlBcGNQQVhaMUNyY1RielZJQWovQjhTT1JE?=
 =?utf-8?B?N1hoTjJrUFdoUWVJRTBBUzVsV1d0Q0VlMDhwZHBWNWUrS0pZQWc5NDllbHh0?=
 =?utf-8?B?WjBBTEY1Z3pmdVNKN2dUeDVJWHpneHJmdERTaWh1RDhuZ1NTdzZWNUIvc2pO?=
 =?utf-8?B?NUN6Y3V6YnM0SDRENi84aDgyaGFqYk1PRjhoSnBaeWVTMmxLSFhMOW8xbzZy?=
 =?utf-8?B?YW1JS2V5bUlOSVoraHoxQ1EvclZnLytsTUt6QjNXTkU5STR5eTFWRFFBWlV0?=
 =?utf-8?B?ZnU0Yzh6cWc0MFFjVndob3pPaXJHMjZQZFJUallYSmdCZ3ZnV0VpZzFnU0VZ?=
 =?utf-8?B?VE96NUNsQi9QbzR4azhHdXBnNGo2aU42UDFyNjlFWVlKdXovd3J1azZSVW5N?=
 =?utf-8?B?YUZvaXBiVVdyTm45UWNyVFQ5bjRPY2hsd0xVdVBINkNNNFJoUjhBUmwvN1Ex?=
 =?utf-8?B?S0QvMkJSdmpBaXRLOS9xeENZSThGWDcxSU42aHVqQWdWclEwYVJ5dGRESnRR?=
 =?utf-8?B?clpsRWh5RW85WXdFclc0YU92QktIUlhZMWs4aGJ4UEwxNUNlNHBZRDd5Q3Ny?=
 =?utf-8?B?cjNtdjdUcVlPYmJpNkplTkxGUzFaRVpYNjRaeFAxTzl6QWxROHlTQjVKSE9a?=
 =?utf-8?B?c2hkand6Z0pLeWpEbEhSVkJmRG5CNzB1cVM4cjN5Wk5RUld3bUZrbmkwaUZ6?=
 =?utf-8?B?SU45c1g0RkF3aWhNbC9zdnFaMTBNOWNGdFRKeHVzWXBSZVpzSzVOcm9pWlZZ?=
 =?utf-8?B?TktVR1hPZlBGbmZaWUdUODZrUm1ROFBYd2pzUmlkMlkwTTRLaXZZL0ZTYmU2?=
 =?utf-8?B?Q1Q1V0VKaHR5WlVCMHBmT3ZJb3loMHZSZXNrMjZGek9naUl1U01CdXRjRDZS?=
 =?utf-8?B?TC9uY2RjNmpncFV0ZkFyZ1lGWi9ublBKUDFtMVE5dGgrK1E0VGRvcnpJVXoz?=
 =?utf-8?B?TW1TN1FyaDJadktuKzNsbHFScUNNT09ZMnQxaWJKcVdTMUc5UXdHK3U4YXU0?=
 =?utf-8?B?eTMxMWhtMEZYVzAzVjBOdjhNbmo0RkNVQ3QvWEtHcVJUd3lDOUR2UExoVFdT?=
 =?utf-8?Q?17RL8IK+GM/SJsSmsI13Ik8xw?=
Content-Type: text/plain; charset="utf-8"
Content-ID: <DD36C27AC4483C46A8BF87D4C6EF3313@namprd05.prod.outlook.com>
Content-Transfer-Encoding: base64
MIME-Version: 1.0
X-OriginatorOrg: vmware.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-AuthSource: BY3PR05MB8531.namprd05.prod.outlook.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 91f4807d-3cf9-4e7a-20ad-08da6110ad8a
X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Jul 2022 18:35:48.4915
 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: b39138ca-3cee-4b4a-a4d6-cd83d9dd62f0
X-MS-Exchange-CrossTenant-mailboxtype: HOSTED
X-MS-Exchange-CrossTenant-userprincipalname: BZh1aOn/kTTHzrFNQmL20lJQYkZEEsQXQ4wacgnRwbqZ7hj3mJoTZwz3PnJFkRoiQSjuQQgP8Z8NBwRLb89pbg==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR05MB8590
X-Spam-Status: No, score=-1.8 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,
        DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO,
        RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE,
        T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
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