Received-SPF: pass (google.com: domain of linux-nfs-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Chuck Lever III <chuck.lever@oracle.com>
To:     Jeff Layton <jlayton@redhat.com>, Neil Brown <neilb@suse.de>
CC:     Chuck Lever <cel@kernel.org>,
        Linux NFS Mailing List <linux-nfs@vger.kernel.org>,
        "lorenzo@kernel.org" <lorenzo@kernel.org>,
        Dave Chinner <david@fromorbit.com>
Subject: Re: [PATCH/RFC] sunrpc: constant-time code to wake idle thread
Thread-Topic: [PATCH/RFC] sunrpc: constant-time code to wake idle thread
Thread-Index: AQHZssdRahirD7+pPUW0IQejq+CcU6+zL6gAgABjxQCAAANfAIAAA4eA
Date:   Mon, 10 Jul 2023 22:43:38 +0000
Message-ID: <B94C13E5-D84F-4BF7-A559-4E701B0AFA6D@oracle.com>
References: <168842897573.139194.15893960758088950748.stgit@manet.1015granger.net>
 <168842927591.139194.16920372497489479670.stgit@manet.1015granger.net>
 <168843152047.8939.5788535164524204707@noble.neil.brown.name>
 <ZKN6GZ8q9NVLywOJ@manet.1015granger.net>
 <168894969894.8939.6993305724636717703@noble.neil.brown.name>
 <ZKwwFNeTw60Wuo+K@manet.1015granger.net>
 <168902752676.8939.10101566412527206148@noble.neil.brown.name>
 <a85a38468bf0af2f5cb38df2e1c20a8baa0bac6b.camel@redhat.com>
In-Reply-To: <a85a38468bf0af2f5cb38df2e1c20a8baa0bac6b.camel@redhat.com>
Accept-Language: en-US
Content-Language: en-US
x-ms-exchange-antispam-messagedata-chunkcount: 1
x-ms-exchange-antispam-messagedata-0: =?us-ascii?Q?lDJHYjcImEnMEgzfMcbSOFVGfynwMWfQYt07R4ajS59NEWO8zYSyqU4sTLm2?=
 =?us-ascii?Q?7wC9AIqZdB4PSpy8m7JzcROPFMlVgXiu+BZPdAMJChQvSJIlTWO2rK0O6IAX?=
 =?us-ascii?Q?6Gtiq/le/S3ab5mfklHQxgUd5IhDjdz8sD8yku/5jxHpLyTGtOupsOkQu0T1?=
 =?us-ascii?Q?b0/WDmtDLgnQibgO2zoeoEcnF/BLXq/rdtkxZRvwA5T14hqUaXEBZbdFvbNH?=
 =?us-ascii?Q?scz2i7G+1xpdJlNImQgvaAwPqzH2WreRlvTKRmsjMMPi/PQOTZTKFnODkUee?=
 =?us-ascii?Q?cQXihKcY5AmmpukdXS9yt4Nu0qYEdTMOMGKSgHHBC16Rg+nFtMIJwc00V7kd?=
 =?us-ascii?Q?qatV3K8XMAFJyU+f5tXThDc710u2dHTl/+yn5ER/Q/Cw7TbhuCfmlgs/dPww?=
 =?us-ascii?Q?RaGq+p4ok8PkaMR959MZ+2uZXpsSHlHnZPl1LVml0Uzr5RYQWknfIvEvaZ2h?=
 =?us-ascii?Q?gxUY2ZNGhmkq6U+ZSxA90IfqDaHnBs5ZjuKxfjaGipLbB0pULStm2WlxvTGV?=
 =?us-ascii?Q?ZQrbrwig39jEOWrclTp5FAVlkKkubZwDL9vWoo1d4fGWQ2TyBzLjpPhmMTFY?=
 =?us-ascii?Q?7fptF0Z7AaBHQny43WvyCFoAkzD1+4ZcgPYzihYFJoCSw4/TaCg1C+Z4g1tU?=
 =?us-ascii?Q?b8DHOQN80ItywFC/nbsJ47jtBNUUXTAEydv5q5FSREtsAzWgvugiSQm8Sz2n?=
 =?us-ascii?Q?CgOBVpTcXkTtSivgqrlqVvRYxOlq5UVm3VJKxFH0FRRqP3ChUn16sGxuCw5P?=
 =?us-ascii?Q?4es+is4gsYEzO5KjGEWRt3PYTk+Eehip5mkiYe9A+Lv82zoT6VsChcz+YtFX?=
 =?us-ascii?Q?QwHmLdwJWJ3JD0RAEHapoRLIwCJ9CepCTOeiykZRcV2eP/2iO7KHH0U683AT?=
 =?us-ascii?Q?TOyH1a8YWYkdWO6WbXwSp2h4KY0Z1M7sLY8qmvC3ov1JsKbda3/SA4kyjHGl?=
 =?us-ascii?Q?6P4m3gxq2QfWsYospgLvLiLRhcBZqq3DB2LbAXlvfAq/to0BLvGIabxmnoQc?=
 =?us-ascii?Q?LjrEjVRjNnxrZ9srqH3xUTGYxly0x8m+mHdn9jzbMMdS4xPtn1kNOmQGJ8g9?=
 =?us-ascii?Q?OgW/tQtKUW/XO0iKzNaU5gpIkSLRapS+USHMpXRZSo4KcmzsaadaqYAHjS9d?=
 =?us-ascii?Q?O6yrmdaPmUxCYYIDsixFWzc2vkqTZNy99A5Wp7H5KSoOuaTwiWqPY1hLcnSO?=
 =?us-ascii?Q?h9LChXjQkG0SjECuS8liypxDfN111nItcd4I90DYzn9hvhir7pAz4FqiLgod?=
 =?us-ascii?Q?IEavUJYQ0y7C/yv+8e3aHcYRC+os0IkMeIuBbOLkp1LQCW+w35cHCTqd3YNA?=
 =?us-ascii?Q?1YjHD4jUa0njmiuX5/YAde8n8GCD4/Z+oJ0NUt56a+mJaM85gRy7P1yBFuW5?=
 =?us-ascii?Q?4wDGNm++5c6qRplIxpHYNyQ6eFRiDA5NGT7jZsToSi6F9pjD1WxZqkEhK/j0?=
 =?us-ascii?Q?MEoGiy/6LY/j9KzTLcMJJIaNWU9fTdis5dGPqJUcw8eDYHe8E+552EDCQFUW?=
 =?us-ascii?Q?jqjDuYlkaLZK1EqNcvtcfQlKN0KDOF7vwANdBgmuUnXWzlUAHqbxhyMEAgN2?=
 =?us-ascii?Q?rkAP8EUJZtHYd+2j/6TXUxjcfJQ37P4JreG9fytRXcH5EOM1C+SH45VxZHU+?=
 =?us-ascii?Q?dw=3D=3D?=
Content-Type: text/plain; charset="us-ascii"
Content-ID: <5672C52AABEDA34DA2A902E6144D63AC@namprd10.prod.outlook.com>
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: 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
X-OriginatorOrg: oracle.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-AuthSource: BN0PR10MB5128.namprd10.prod.outlook.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 84239c91-57a2-4e71-e4b2-08db81971a66
X-MS-Exchange-CrossTenant-originalarrivaltime: 10 Jul 2023 22:43:38.6058
 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b
X-MS-Exchange-CrossTenant-mailboxtype: HOSTED
X-MS-Exchange-CrossTenant-userprincipalname: u72NVaiRQ+MK/C7ILvOaGoTT2lzfqpTVTCwiiIVY1IVaQhMQWePoqDY18A0N6UD+Lc3xxGluiMG+eSaZ/y1Uyw==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN0PR10MB5094
X-Proofpoint-Virus-Version: vendor=baseguard
 engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26
 definitions=2023-07-10_16,2023-07-06_02,2023-05-22_02
X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 spamscore=0 mlxlogscore=565
 adultscore=0 suspectscore=0 mlxscore=0 malwarescore=0 phishscore=0
 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000
 definitions=main-2307100206
X-Proofpoint-GUID: G2GXDVMnLDepmEOgSoe6xaK8QDwR8VC1
X-Proofpoint-ORIG-GUID: G2GXDVMnLDepmEOgSoe6xaK8QDwR8VC1
X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED,
        DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED,
        RCVD_IN_MSPIKE_H5,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,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-nfs.vger.kernel.org>
X-Mailing-List: linux-nfs@vger.kernel.org


> On Jul 10, 2023, at 6:30 PM, Jeff Layton <jlayton@redhat.com> wrote:
>=20
> On Tue, 2023-07-11 at 08:18 +1000, NeilBrown wrote:
>> On Tue, 11 Jul 2023, Chuck Lever wrote:
>>>=20
>>> Actually... Lorenzo reminded me that we need to retain a mechanism
>>> that can iterate through all the threads in a pool. The xarray
>>> replaces the "all_threads" list in this regard.
>>>=20
>>=20
>> For what purpose?
>>=20
>=20
> He's working on a project to add a rpc status procfile which shows in-
> flight requests:
>=20
>    https://bugzilla.linux-nfs.org/show_bug.cgi?id=3D366

Essentially, we want a lightweight mechanism for detecting
unresponsive nfsd threads.


--
Chuck Lever