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[195.250.132.146]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48e8e5d3107sm23709625e9.1.2026.05.12.01.54.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 May 2026 01:54:35 -0700 (PDT) Date: Tue, 12 May 2026 10:54:34 +0200 From: Michal Hocko To: "zhen.ni" Cc: akpm@linux-foundation.org, vbabka@kernel.org, surenb@google.com, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v6 0/3] mm/page_owner: add filter infrastructure for print_mode and NUMA filtering Message-ID: References: <20260511033017.747781-1-zhen.ni@easystack.cn> <4a06f50f-fb7a-4b5a-a9d7-664407f83472@easystack.cn> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 31A8CC0002 X-Stat-Signature: souxhbefqg98anbdbjjifdp8p3ah8kw3 X-Rspam-User: X-HE-Tag: 1778576077-204219 X-HE-Meta: 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 XSO0d4DG BMBR5vviBZGaJLqJA0M0TbVm6ygHPtK4fSzWS/N73Q8Fc7o4zi717+pRK6Vk1yEF5bHLnfVKRSh0Xewc4zvpmnEB8R4Icq85rg22W4HroGEAnEa05F91c8/02XqI3Z+kEl5BwVT+noKBQTNnGIf0YTaVDuAn9tOqoZFo5OYz2aWrGahFTZDBodHVaAiPxHPIfos/bO0hmfOjxRIjOmSVCI6HbGzhJORmH8US/Qwv65qG6wxt/w7T9rI0Z/sHZZ20XN7E482JM37cEbZSGlz+T2WleTNAWQPyRbf5cGt+dr01QDQ/wu+mCvfPQhYH1uRvfCWCFhiJkH3aL4AC9xysNEh8IrNRxFoYcD/J7a/pnrREQ7m3clgNkjDryizcKL88BJD3/AfVK6DkopojhCYT+O//YRTM3p/y5L4r30x2OL2KEE1s= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue 12-05-26 16:16:36, zhen.ni wrote: > ## Implementation Plan > > 1. Add per-fd filtering to page_owner file > - Add .open/.release/.write callbacks > - Each file descriptor has its own filter state > - Write filter commands: "nid=0", "mode=stack_handle" > > 2. Provide user-space tool > - Simple CLI: ./page_owner_tool --nid=0 > - Handle fd management internally > > ## User Experience > > Direct access (default: no filter): > cat /sys/kernel/debug/page_owner > > With filtering: > ./page_owner_tool --nid=0 > ./page_owner_tool --nid=0,2-3 > ./page_owner_tool --nid=0 --mode=stack_handle > > ## Benefits > > - Completely eliminates race condition > - Per-fd isolation for concurrent access > - Correct design for multi-consumer scenarios > > Does this approach look good to you? > > Please let me know if you have any suggestions or concerns. Yes, this is what I had in mind. Thanks for looking into that. -- Michal Hocko SUSE Labs