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From: Shakeel Butt To: Mathieu Desnoyers Cc: kernel test robot , oe-lkp@lists.linux.dev, lkp@intel.com, Andrew Morton , "Paul E. McKenney" , Steven Rostedt , Masami Hiramatsu , Dennis Zhou , Tejun Heo , Christoph Lameter , Martin Liu , David Rientjes , SeongJae Park , Michal Hocko , Johannes Weiner , Sweet Tea Dorminy , Lorenzo Stoakes , "Liam R . Howlett" , Mike Rapoport , Suren Baghdasaryan , Vlastimil Babka , Christian Brauner , Wei Yang , David Hildenbrand , Miaohe Lin , Al Viro , Yu Zhao , Roman Gushchin , Mateusz Guzik , Matthew Wilcox , Baolin Wang , Aboorva Devarajan , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, christian.koenig@amd.com Subject: Re: [RFC PATCH v7 2/2] mm: Fix OOM killer inaccuracy on large many-core systems Message-ID: References: <20251031144232.15284-3-mathieu.desnoyers@efficios.com> <202511061432.4e534796-lkp@intel.com> <6hmgutxgdchs4qz6hprwsecwoygwszn5ywixxrvnereilegcsx@mxroaotaw2me> <7732c2eb-e547-47a8-93b3-1d1b4d9c27e8@efficios.com> <7b76f0e4-6148-4290-a295-7ceeb1ef2feb@efficios.com> <81258c9e-1436-4a4f-9343-ef574b8b0de6@efficios.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <81258c9e-1436-4a4f-9343-ef574b8b0de6@efficios.com> X-Migadu-Flow: FLOW_OUT X-Stat-Signature: t3cgxyk9fi4d4dczdkonnr54gmrr8eae X-Rspam-User: X-Rspamd-Queue-Id: 23ADA4000D X-Rspamd-Server: rspam10 X-HE-Tag: 1762560134-763086 X-HE-Meta: U2FsdGVkX1/pEoZD3mQoP1DJd+qi3BdKkt61dq58JuarOiLIB1vwgBZ7wffFoXNSfija2m5B35BKVnladOSbCpqStMfNKEgtRPF6QJ2eDj/kicr1K+8+80eApUyLyg9WJr2gwKfOBD3ol+dZ9HvYahSkannnq9NrcI3l3Xac+5YPdxz/vBi+19Sx0SRV18nR8AqW8TSnq3qaCwWx43a2sqXAkOc16KcBWHw9CLAUDT7F28Opn67Xr1D4LqaaeuvMtDpQWl3PYcvJ4Zix6iO3RrY/Wdin6SK74YoYX+x2Ck/xA+DlehUP/W35A+9EdgeP2XdsHn/esbZaL+6CnLxuEhph5xW603BU5KxGoj8uRyjjODOq16gInn261M7ethCLG0Sw+yBtUvyqt3pm1qBNP2HsBXIcqoc7Vk2J/xIQvmWXg2F8i0/VnP/6Yun/3onZeXfkhhGNe4UbLYK+qtfcvTX1e5+UUoRM14O5pvHK0vJfkRq0WCIagabQ0klbkU9gF4DMVNrBLPXEuqVdXFjzsU8bdwdqJxb8pOpnO6oa47bpWn2ObJlsrI0zXjOaHay5hrl6zbVY3F2wxgiiSKOjxoaWYcZczzkpJIE1+Iw2ST33R7dXCX3io/qeLdkIJkO06AiPpaH2xQQoCZnPU/oD/K7kUfyh2QTeyw5uleKyrHbRf7NXPw5hnuMu1O3F8XEq0S8udiOllOoKpjqzedgot7tlEcVEog3Z/NOMS+ty1BHu3hiiHeRuJ2zy5aOgDTMF0N1OjMrvLc7pkYE0v6DrUxLsid2ZEKxOZeMikZ0/rVzNPkbVnUuPCpHBpWoxsV/mIxy5OPAYRLpNAgolnh2IASS+z89n0ppgTqSKSoUiT9LBpy4kueXkrKuSTzNZHpJbQHyTcvGVJEv1aZKv+JUJ8aKwtIhJUhHhxFXiTD9nXapcVrNjEGToXga5ODxhjWDOjpq+DJwNBgQTV2jMs70 fe49KXfd 67lqnbI8Zc9ymOSNcttwXq8CbyoU8fVshg099F2TRhRp5CzAiB4muYVVPw9JA/8wcaB9aoyp8fFANhFI+gvI8xqQrwmUIs9ID91LSZrgcl171KC+zyRP32Ac8glu9PRoYsz/U+V0R5440JPzX9HMcipGfN1DaZQe+Nj6eqMVqTOiHc+pA45D8egzD7UuYT8HG7f9TCT8dpsVf8ge3w2Dbn+i1iVF38PJptDNmEhWScT6/hpV0C09ClOKSfHYR4FFqdLntxx2WXeHZdHlF0TKiqhcP4w== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Nov 07, 2025 at 11:04:01AM -0500, Mathieu Desnoyers wrote: > On 2025-11-07 10:53, Mathieu Desnoyers wrote: > [...] > > > > It would make sense to call an explicit percpu counter tree init > > function from start_kernel() between the call to mm_core_init() and the > > call to maple_tree_init(). This way it would be initialized right after > > mm, but given that the hierarchical counter tree is a lib that can be > > used for other purposes than mm accounting, I think it makes sense > > to call its init explicitly from start_kernel() rather than bury > > it within mm_core_init(). > See the following diff. If nobody object, I'll prepare a v8 which > includes it. This seems reasonable to me, I see v8 is already posted. I will take a deeper look.