Linus Torvalds wrote:
With each invocation being thousands of instructions and a cross-CPU IPI for the tlb flush, that kind of stuff adds up. We're likely talking real fractions of a second, rather than milliseconds.
Doesn't vunmap batch the cross-CPU tlb flushes to amortize the cost? Hm, no, it doesn't seem to. Oh, right, it was one of Nick's TBDs.
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