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T2LsUf/tNVJSUs8YQlzTTtUK5Km4j2yEBKBEODwimZFASqkKPz7RTqWDME3e+/Uaao9l8Tk6kGz85kk9axn9AzVmRS1obAZwnhcBShLLLMvFz5LCAwlr33cY8IZHt+FYaWTyMp+HOHn8tisbyAYpPoH93w9fX5cxTjQnZhsJBKDgkNsY8GKvCr5+453JbwFv6XEHuKkE1TMn26SI5cLQG7DajTfpOSs8bJod0tsW2b5AkYukmXSVDKI8MgPnFSRgWDM2ZqA4b/0Qlt+JpVrLbQ2342S3e6tXFUr9bp+gJ8Idk4ZFAVmLbngK2T+TeILpW7dkcblG4wigeAT/LYd7HtSrtmgyIx+SLasdgD2oAjMEpZO/lEIqUb+gqVbt5WRAX0s18GLIwN6XEzkK/3cfUF69SwW6vvvHDSbl6O00ifShgY5y52zu/Vnf/tlTqJTPgm5majavSaNqYhCst/dXkzbUM55ntH4RzpNfjER53Ostd4/I= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 5 Oct 2026, at 2:29, Will Deacon wrote: > On Sun, Oct 04, 2026 at 02:06:48PM -0400, Zi Yan wrote: >> On Thu Oct 1, 2026 at 7:06 AM EDT, Kristina Martšenko wrote: >>> This series allows the kernel to use TLBI domains. TLBI domains (FEAT_TLBID) is >>> an Arm architecture feature that enables a TLB invalidation to target a subset >>> of CPUs instead of the whole system. It can improve performance on systems with >>> many CPUs. TLBID is not yet part of the Arm Architecture Reference Manual but >>> some of it is described in the latest XML [1]. >>> >>> The goal of this series is to send TLBI commands only to the CPUs where a >>> process has run (i.e. where its page tables have been installed). The last >> >> IIUC, mm_cpumask() is used to store this information on x86 and other >> archs. I see you put this information in tlbid_domains of mm_context_t >> from patch 9, although in the form of tlb id domains. I wonder why not >> make arm64 also update mm_cpumask() like x86 and other archs and derive >> the tlbid domains based on mm_cpumask() and a cpu-to-domain mapping >> (added in patch 7). > > Historically, maintaining mm_cpumask() was a horrible source of contention > when we looked at it in the past. Maybe that's no longer true, but it Do you have a pointer to the cost you have in mind? LLM can only finds some overhead reduction work done by Rik for x86[1][2]. [1] https://lore.kernel.org/all/20180716190337.26133-8-riel@surriel.com/T/#u [2] https://lore.kernel.org/all/20241114152723.1294686-2-riel@surriel.com/ BTW, patch 9 is updating tlbid domains unconditionally. It can be optimized in the same way as Rik did for x86 mm_cpumask(), read the tlbid domain first and only update if CPU is in a new domain. > would be good to see some numbers if we want to start keeping that thing > accurate on arm64. Best Regards, Yan, Zi