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:   "Zhang, Qiang1" <qiang1.zhang@intel.com>
To:     "paulmck@kernel.org" <paulmck@kernel.org>
CC:     "urezki@gmail.com" <urezki@gmail.com>,
        "frederic@kernel.org" <frederic@kernel.org>,
        "joel@joelfernandes.org" <joel@joelfernandes.org>,
        "qiang.zhang1211@gmail.com" <qiang.zhang1211@gmail.com>,
        "rcu@vger.kernel.org" <rcu@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCHi v4] rcu/kvfree: Prevents cache growing when the
 backoff_page_cache_fill is set
Thread-Topic: [PATCHi v4] rcu/kvfree: Prevents cache growing when the
 backoff_page_cache_fill is set
Thread-Index: AQHZbIGxbWUDlcMT0UGxZ1kF5gEgzq8mUJOAgACNBpA=
Date:   Wed, 12 Apr 2023 01:14:36 +0000
Message-ID: <PH0PR11MB5880BB47DCBDC36F3F432F91DA9B9@PH0PR11MB5880.namprd11.prod.outlook.com>
References: <20230411142733.1011223-1-qiang1.zhang@intel.com>
 <16bb9c4c-e27b-4483-a1d4-05245b8b1a51@paulmck-laptop>
In-Reply-To: <16bb9c4c-e27b-4483-a1d4-05245b8b1a51@paulmck-laptop>
Accept-Language: en-US
Content-Language: en-US
x-ms-exchange-antispam-messagedata-chunkcount: 1
x-ms-exchange-antispam-messagedata-0: =?utf-8?B?UU4vRTBRNHozb0Q0S2x6cmNRTWNXd1Y3OThUakpDQ3dmclJad3Z5VXlMT2NB?=
 =?utf-8?B?YnlLV1RMTmxKZHRvSVQyRENPaDZEQ3VkYUQ3dkl0YnpQYXZvKzlPdEhrNDFm?=
 =?utf-8?B?T2FvbVBEbE1kenoyc0YyNStkYmVuNWhoTWVMM0ZDKzZiSzVxTTdTTHpSTzlF?=
 =?utf-8?B?WWNXL1pFKzVyYXhpV1Q3SC90enBYTDBRdllXZjAwbTVMY3ExNE54NjNrU3hi?=
 =?utf-8?B?QjJsRVNPSDZtRmtOMkpoT0dtaGlSV3I4RnY2VmQvNUhDd2NXa2JMaVhVMGtN?=
 =?utf-8?B?ODhscjV6d3Y0b1VyVjVYdm5ybUowZGV1WnBJNWFTUXQ5Q0xWamxyVVhybEUw?=
 =?utf-8?B?V0FhSVFKZDNSRU90WE9heThXakdUSFZka2d0RkNmb3hOTUZzUlh3eFl3QmEr?=
 =?utf-8?B?NGdteTNEMi9wSWVUZWNZTWVXbnVxK1RtTVQ1bDQ5Mjc0eWw4RHZqcHp1Z0cw?=
 =?utf-8?B?N29RYUJuclYwRDJvd2pxVjBOZ2Q1RDJ0OHNVdzJUV3dNUTAyd05OWEpaWnpH?=
 =?utf-8?B?UEI3T05ObFBzeStXYTR6ZHpTSERKb05ZanNKTmFWNi9vRGpzL2JYbzgxRnNr?=
 =?utf-8?B?T3pKMUN1SlZJU3lXanFHNzVFYS83S0NSbDZjRmRMZjdaU01NTENObVpjRk10?=
 =?utf-8?B?TFJQWGEzSGFQY2tvQkhyWlNDZWd4VTF5YStlUTIvMUgrS3hTSXQ4ZmFWSDdR?=
 =?utf-8?B?S0VlS1hyZmtGVHNsTURNelFlNXorbnJBaTIrZGVOWmdSTzFMWStSaGxqRW81?=
 =?utf-8?B?cUlPZDZoS2ZIZlQ5TTg4YndxVCtTOHcvMTE5TG5mQ1BIcHkzck9MVVpsV2FL?=
 =?utf-8?B?SmdmU0lra0VzaFhpQnJUaUdSZVFqMGM0azNRbll5VDF2djB1YW9hRFNHa1lL?=
 =?utf-8?B?Zi9vclp5ZEYrZXFjc0JzRFp1U2JYNndUcFUxSHVKSlZZcFhKa2ZmVEkxU0ln?=
 =?utf-8?B?blhReVZxM0pPU2htS20zZG8wVlVhWE9oK2JuMy83UzRvVENzZUNyejU3VDhs?=
 =?utf-8?B?Rm5XVUFLNW1iNVprSm14M2VsVjdFSzdkZnRGSnpOL0RkOThHc3h1OEZFT2pF?=
 =?utf-8?B?NzROSnp4NHlURzRBQUJYbmdyRHplQjUxVUszTkdUeHVNQXUzVWNpMVpGdXI5?=
 =?utf-8?B?NEMzbGJCTWdIMlFsNmZwR3p2a25SYVNzdzBBRElvSi9lRGhJQ012TDA3OG13?=
 =?utf-8?B?RlFnb1RENHFycUsycFROTnZXS3A1dm1lQWEveGhDWnIyOE5FUHNoN1Y4T25J?=
 =?utf-8?B?bWZ4MVFhMXQxS0w1Y2YwWE5lMzFjR0hmM3MzZTVPeGIveDFScWFyMld4UCtY?=
 =?utf-8?B?cG16VXVpYks0cEZ3N2UyVlljS0VWc241c2svRlE3M045S3BKTS9YZkJKRXc1?=
 =?utf-8?B?UmhlcUNxNkErVWdEeiswZzF5ZlIvOEpOOGRCTlUvQWo4aXZQanJaOUxJK3U3?=
 =?utf-8?B?ckllKzZZZ2hSejBBSkNpSENCNzAzb0xmbm9YcW9EdEpWZXFOa1B4Skh0Q3Rp?=
 =?utf-8?B?N0NuYlkrREg1OUtLOEI5NEFHeDU3R3FBc3NhaktCWUpjZzl1Ly9nWGV3TlhE?=
 =?utf-8?B?MkI1THhQVWlQUGkvTTB1V3FqR0Nvc0hlNTdYQU5UeThQMzZnY2NNQUFyK25T?=
 =?utf-8?B?d3h2QkRUZVJzR1dlalVsaDEzQVBNbThTcEUweVR2SjZnV3kvQzJ6dlFydDhM?=
 =?utf-8?B?SmFvMDY5eG9QNlRpcE81Q2ZSVURWR0NZR0V5aFYwcWpDZDVqT3FpeTJYc3Z2?=
 =?utf-8?B?UVo3cUk5NGRudE5LNHgzL1hwdEZwQVlzQVVLbW1EN2lsU0xMRExNOHptNVBo?=
 =?utf-8?B?S2lGNUdDWjFnWkxRRk5BOUE4WWUyNkpWdEZFWUg2QTh6UDNTMzE0WW9ncjR3?=
 =?utf-8?B?SE9MRHpJQWhJcERoeUhnQmUxZVVGekVWTlI1bDZiemNXeFFISEtWWkwrbWE5?=
 =?utf-8?B?Z01oaXkwaHQyUmZoZnJrZk41MVZzaXhlUU90NE5PdG4xSm9CMDFEWGdlUFBC?=
 =?utf-8?B?RlhDV2MrQUx1aTZOMWpMV0hIalJqM1gxbmMzbENBUHhjQndMcmVHSWpnOTNI?=
 =?utf-8?B?U2ducG44MkpjMC9xaTlNdjl0QkZEM2QwWFQ3TVlDRk5UbGJMN2lKYUdvWks4?=
 =?utf-8?Q?QNON3bmTOBgF8ALzCeM1H3Fy1?=
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
MIME-Version: 1.0
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-AuthSource: PH0PR11MB5880.namprd11.prod.outlook.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 58050cd5-2342-4c98-19e2-08db3af3482b
X-MS-Exchange-CrossTenant-originalarrivaltime: 12 Apr 2023 01:14:36.4854
 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d
X-MS-Exchange-CrossTenant-mailboxtype: HOSTED
X-MS-Exchange-CrossTenant-userprincipalname: hdYIfoP1uDW25Mt8MG/HTPLWMMZjQla4WFVeTlOqWUmw+gihUzGbIyE5ircsu3YrqbI4vx4KE1V2cBZvrMGOaw==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR11MB6618
X-OriginatorOrg: intel.com
X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,
        DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,
        SPF_HELO_PASS,SPF_NONE,URIBL_BLOCKED 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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