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Thu, 9 Sep 2021 01:50:25 +0000 Date: Thu, 9 Sep 2021 09:48:49 +0000 From: Huang Shijie To: Matthew Wilcox Cc: viro@zeniv.linux.org.uk, akpm@linux-foundation.org, jlayton@kernel.org, bfields@fieldses.org, torvalds@linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, song.bao.hua@hisilicon.com, patches@amperecomputing.com, zwang@amperecomputing.com Subject: Re: [RFC PATCH] fs/exec: Add the support for ELF program's NUMA replication Message-ID: References: <20210906161613.4249-1-shijie@os.amperecomputing.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: CH2PR18CA0032.namprd18.prod.outlook.com (2603:10b6:610:55::12) To MWHPR0101MB3165.prod.exchangelabs.com (2603:10b6:301:2f::19) MIME-Version: 1.0 Received: from hsj (180.167.209.74) by CH2PR18CA0032.namprd18.prod.outlook.com (2603:10b6:610:55::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4500.14 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?VIZerXXUp+I2pQTO6YMkaGNQyhUxamD/xMh9OlUwAgE5RTK2tpCbiLZCkUOD?= =?us-ascii?Q?8Hb9H4IMPR8h0sYFiXtY1kVpJ/z9Y72JD+B0SnYnthgL5Q96AHLu9VqgGVOZ?= =?us-ascii?Q?eaAfBxqX2qZ1RQu1iyR0R/piyfSNeKqlgPAxjXAzni5p98VuNZUWaFLRAoAW?= =?us-ascii?Q?cLGDMt5YwtViO+vC+HySHJmxHlZ12rS1i0B5tTsXsa3TBeM0aKSuP7IRPlS+?= =?us-ascii?Q?a/q4wAm5y+t2kDvG/5Ja2DKndGIbQ73oBAyjoM/mn2biQqA791CUNXlTLv+C?= =?us-ascii?Q?LyfJWwu/YB3nFJeKvGXQ+C/v3sH4RqdhCM23i37DoWtqSgN5tZwucYlBsSt9?= =?us-ascii?Q?7sqtUyetiuVtunb9vh3Hb1Vj2a5EjHkdTr/Xyg3nB9iVAxR3lPhObBbFomPL?= =?us-ascii?Q?txBDUIfXC6bMw9QPjaVgt3Kw6tIi+oN54G3wjsv+3uEJQcUxklePZsIM3wGU?= =?us-ascii?Q?eNiBVC/rOyzI8yQVH2wJHyrzcnQQPufbw1LFIZgROaXA86YtrS0tj/RNwbDS?= =?us-ascii?Q?Y/yL7IRLWMNG8W43SIvKWGCO156hZbnB9fNVGNY7LOuyrAuruO1/Y1RTipl4?= =?us-ascii?Q?/QH8ntY7xa72kb/tRhwGf+Y9L744MpOfDXrOq536Fb/zrHkb+T/OnystDBB5?= =?us-ascii?Q?TrsTqvitAm+VSMaDq7LfqsRImxTVkP/LaLfMwwiVnJ/RMezkBCjUHujEauDB?= =?us-ascii?Q?6dPRHaUJduR6yYQDk8OjFm7z04zF/SoAeDof/0UEN4SFkZJOmc/gz/7MCd/o?= =?us-ascii?Q?bi3UiG13ovmRSU2mwOkin/Kk/ejtOB78mB+DFTELBMxO7Wws3MaH0oSwli/Y?= =?us-ascii?Q?CaRiNEN4P8igHa9aCi4TMnsZUqYYWjjCOJhuOIj63oBMezpbSPO+it/xwIBB?= =?us-ascii?Q?z2GAYwXxD77rOXLOP5vaC2EWuKdpnMNwAfUMM3acdODhXT0dfkaMqnHmz9Cl?= =?us-ascii?Q?/tu2B9kOr9ONiugJI8EXYZKT1jB0hAGIh6Vuu4s5FOa5gxleb7cvK88UTIVR?= =?us-ascii?Q?2zJSnIeMW8suip/beTPnimXZIP7ZYwWbKGrdCYWJHzQtyWF9QQWv2TMJ9Naz?= =?us-ascii?Q?7GsC+pMBi79qgFZ1Hx0phR8lTtbt0qnCCHKJCi3aY9D3PaYlWLk+4Aklyr0G?= =?us-ascii?Q?6nNjAhs6lYNceS+S27OrPnj6OAYT6W/GTYP8ZVQULZ2oRVUwi6pcl3R5ls0W?= =?us-ascii?Q?UvmUbgOjwZodtpRqZpobI+myFOdTahI5y5NsvNFCJcL2Z6scH2N7hkx8dRF6?= =?us-ascii?Q?9xdIQH+OgaXOXkmYMFpoYtO9G34N6/Xa0K0/GYrPSPfclqbyNXkDduykJkBA?= =?us-ascii?Q?ED9QVkiwGQooOA44UoDv+D87?= X-OriginatorOrg: os.amperecomputing.com X-MS-Exchange-CrossTenant-Network-Message-Id: 485319db-13de-4725-d422-08d973343103 X-MS-Exchange-CrossTenant-AuthSource: MWHPR0101MB3165.prod.exchangelabs.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Sep 2021 01:50:25.2131 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3bc2b170-fd94-476d-b0ce-4229bdc904a7 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 5A+RnftRY/d/E0uCDuf3APFTzITZ88TPkMkYPhpobJlw8j4fKe3iAupcO+FwhwzD/HvgRWiX6/NGvmgumiVMZVguELA6nbyDbxCPIaV/P8uMR0toiJvsuDDA/8WTjVvY X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR01MB2688 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Sep 06, 2021 at 01:09:22PM +0100, Matthew Wilcox wrote: > On Mon, Sep 06, 2021 at 04:16:13PM +0000, Huang Shijie wrote: > > This patch adds AT_NUMA_REPLICATION for execveat(). > > > > If this flag is set, the kernel will trigger COW(copy on write) > > on the mmapped ELF binary. So the program will have a copied-page > > on its NUMA node, even if the original page in page cache is > > on other NUMA nodes. > > This does absolutely nothing for programs which run on multiple NUMA > nodes at the same time. Yes. Not suit for that case (Mysql database..). > > Also, I dislike the abuse of the term "COW" for this. It's COF -- > Copy On Fault. Maybe it is better to add new flags "NUMA_REPLICATION" in mmap(). :) Thanks Huang Shijie