Re: [PATCH v4 2/2] arm64: support batched/deferred tlb shootdown during page reclamation
From: Anshuman Khandual <hidden>
Date: 2022-09-27 06:16:58
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[...] On 9/21/22 14:13, Yicong Yang wrote:
+static inline bool arch_tlbbatch_should_defer(struct mm_struct *mm)
+{
+ /* for small systems with small number of CPUs, TLB shootdown is cheap */
+ if (num_online_cpus() <= 4)It would be great to have some more inputs from others, whether 4 (which should to be codified into a macro e.g ARM64_NR_CPU_DEFERRED_TLB, or something similar) is optimal for an wide range of arm64 platforms.
+ return false;> + +#ifdef CONFIG_ARM64_WORKAROUND_REPEAT_TLBI + if (unlikely(this_cpu_has_cap(ARM64_WORKAROUND_REPEAT_TLBI))) + return false; +#endif + + return true; +} +
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