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akpm@linux-foundation.org, vbabka@kernel.org, surenb@google.com, mhocko@suse.com, jackmanb@google.com, hannes@cmpxchg.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v12 3/4] tools/mm: add page_owner_filter userspace tool Date: Tue, 07 Jul 2026 12:13:54 -0400 X-Mailer: MailMate (2.0r6290) Message-ID: In-Reply-To: <20260707115411.1714314-4-zhen.ni@easystack.cn> References: <20260707115411.1714314-1-zhen.ni@easystack.cn> <20260707115411.1714314-4-zhen.ni@easystack.cn> Content-Type: text/plain Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: BL1PR13CA0365.namprd13.prod.outlook.com (2603:10b6:208:2c0::10) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|PH7PR12MB5735:EE_ X-MS-Office365-Filtering-Correlation-Id: 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Jul 2026 16:13:55.2369 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: tiYnSxFOziQSQGFWcBTH45BRu7fkSymivtESoKIs3WTfWnzyitO9goGLwfYfDN21 X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB5735 On 7 Jul 2026, at 7:54, Zhen Ni wrote: > Add a userspace filtering tool for page_owner that supports per-fd > filtering with print_mode and NUMA node filters. > > Features: > - Three print modes: stack (default), handle, stack_handle > - NUMA node filtering with flexible formats (single: 0, multiple: 0,1,2= , > range: 0-3, mixed: 0,2-3) > - Per-file-descriptor filter state for independent filtering > > Usage examples: > # Filter by print mode > ./page_owner_filter -m handle > ./page_owner_filter -m stack_handle > > # Filter by NUMA node > ./page_owner_filter -n 0 > ./page_owner_filter -n 0-3 > > # Combined filters > ./page_owner_filter -m stack -n 0,1,2 > ./page_owner_filter -m handle -n 0,2-3 > > The tool validates inputs before sending commands to the kernel and > provides clear error messages when the kernel does not support > per-fd filtering. > > Signed-off-by: Zhen Ni > Tested-by: Zi Yan > --- > Changes in v12: > - No changes > > Changes in v11: > - Add signal(SIGPIPE, SIG_IGN) to ignore SIGPIPE and handle EPIPE grace= fully > - Treat EPIPE from fwrite() and fflush() as success (broken pipe case) > > Changes in v10: > - Improve error handling: check fwrite() and fflush() return values > - Handle EPIPE correctly: treat broken pipe as success > > Changes in v9: > - Fix isdigit() usage: cast to unsigned char to avoid undefined behavio= r with non-ASCII input > - Optimize I/O performance: replace fprintf() + fflush() in loop with f= write() + single fflush() after loop > > Changes in v8: > - Add validation to reject multiple dashes in nid list (e.g., "1-2-3") > - Fix snprintf return value handling to prevent command overflow > > Changes in v7: > - New patch for userspace tool > > v11: https://lore.kernel.org/linux-mm/20260625043101.338794-4-zhen.ni@e= asystack.cn/ > v10: https://lore.kernel.org/linux-mm/20260618035750.3724613-4-zhen.ni@= easystack.cn/ > v9: https://lore.kernel.org/linux-mm/20260525081652.2210206-4-zhen.ni@e= asystack.cn/ > v8: https://lore.kernel.org/linux-mm/20260520075641.1931080-4-zhen.ni@e= asystack.cn/ > v7: https://lore.kernel.org/linux-mm/20260515091942.1535677-4-zhen.ni@e= asystack.cn/ > --- > tools/mm/Makefile | 4 +- > tools/mm/page_owner_filter.c | 310 +++++++++++++++++++++++++++++++++++= > 2 files changed, 312 insertions(+), 2 deletions(-) > create mode 100644 tools/mm/page_owner_filter.c > Acked-by: Zi Yan Best Regards, Yan, Zi