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Fri, 19 Dec 2025 16:01:14 +0000 Message-ID: <2fb78e41-5e56-425f-925f-a29524355d2c@efficios.com> Date: Fri, 19 Dec 2025 11:01:11 -0500 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v10 2/3] mm: Fix OOM killer inaccuracy on large many-core systems To: Mark Brown Cc: Thomas Gleixner , Andrew Morton , linux-kernel@vger.kernel.org, "Paul E. McKenney" , Steven Rostedt , Masami Hiramatsu , Dennis Zhou , Tejun Heo , Christoph Lameter , Martin Liu , David Rientjes , christian.koenig@amd.com, Shakeel Butt , SeongJae Park , Michal Hocko , Johannes Weiner , Sweet Tea Dorminy , Lorenzo Stoakes , "Liam R . 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U2FsdGVkX1+4Anu+k6sRnNjaTflPnuv2izpAeWsXu3jrHHyEExjtut/WzMwomjnRqeNUKiIzI+eisMVgAq8NvhSfUpABRG3wbAj++D7vDLRu89UFKEvkB6Luayu0qoS4aa6ddg6DavXd8L7SdmLdxI4Qvkw92HRELEQ5ct3f/VCS48tJeS0EPzAs8GJfmBtCfJjgAqw5Zx+/Q8ssXWJ0geEMUl/CFgdsmBXY91+akZGvXRXUKG7nfXGFvenlt1F1PzzlV7tYv9rGtGSR8BFBa8pnxDAU67U4++CZ4iAzH4bTJSb/yQyxOXtAjmcVMP5OFGRci77RfNkGz73zkn0ywOgxKm0EcpwLOfe0eu+c8CT2ow6uvxOlUfa+byTAXAosHqyz2oo0hc08Chr0UcrRanHx1aNBvsBQKP6vLiYRSbplHiIqhLRVYME/MSlb+QP411un3srW3pVhJsIi4VZDkXg+q5Ujw/LUJL5g1OQWDQ4FE6HiJjj5lJSf1KhuQ3uREfxw22da6/9K7h6kccMZmgkvyxr0aZinbiTRHrmVt9yk/y3Gwk9p05Ud9LH4itozI+1g7rl/F4JeUHv1S+njA80E2UljMXFKONq5Ez0mbHp9W7Lru/ZpF9lwVKrjH/qRKBWfTQBdhEpUf9aADsx6VSaPjrSYqAgSmDwWOi1Du/nyu7C0mU7hjMaueoZZoo9BAc5lbHmbpXnXwyQBvQXFZcrz2ZBLrNva3AZNOgvLGPxI9w4LrCdTWS3kNjdklR1iWuSn7gqb2rdlNMkDbphT3xLiAIbCXyXF7lF5D3i8CXhWWCL41HUwqCpLh4YLqkDlZLa5dWadIytD5CNC0lGsv8roVBAlmK5Wbf1RXFJHcAmwQUli93ut4PAUpX3C30+DbcqsaUm/v4/BrHS74ZwZGmiyx3dCk5gxHBJK1QGxdpXLHIMVefRn3cFo4CElchINpJWTxnXvnXc9dFxNj/o ryL1nlf3 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 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 2025-12-19 04:31, Mark Brown wrote: > On Thu, Dec 18, 2025 at 05:18:04PM -0500, Mathieu Desnoyers wrote: >> On 2025-12-18 13:00, Mark Brown wrote: > >> An ugly work-around that may work (and then we can improve on this), >> at the end of mm/init-mm.c:init_mm (completely untested): > >> .cpu_bitmap = { [0 ... ((3*BITS_TO_LONGS(NR_CPUS))-1 + ((69905 * NR_MM_COUNTERS * 64) / BYTES_PER_LONG))] = 0UL }, > > That doesn't seem to fix the FVP unfortunately (BYTES_PER_LONG doesn't > exist, but even just deleting the division entirely fails in the same > way). I just noticed that there is another static instance of mm_struct: drivers/firmware/efi/efi.c struct mm_struct efi_mm we need to apply the same fix to it as well. It seems to fit with the currently running task when the oops happens: [ 2.482454] CPU: 2 UID: 0 PID: 12 Comm: kworker/u32:0 Not tainted 6.19.0-rc1-next-20251218 #1 PREEMPT [ 2.482609] Workqueue: efi_rts_wq efi_call_rts [...] [ 2.485094] acct_account_cputime+0x40/0xa4 (P) [...] [ 2.487172] el1h_64_irq+0x6c/0x70 [...] [ 2.487853] __efi_rt_asm_wrapper+0x50/0x74 Thanks, Mathieu -- Mathieu Desnoyers EfficiOS Inc. https://www.efficios.com