Messages in this thread | | | Date | Thu, 4 Apr 2019 16:31:03 +0200 | From | Sebastian Andrzej Siewior <> | Subject | Re: [PATCH v9 00/27] x86: load FPU registers on return to userland |
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On 2019-04-04 07:26:37 [-0700], Andy Lutomirski wrote: > I think that David was asking whether we could make kernel_fpu_begin() > regions sometimes be preemptible. The answer is presumably yes, but I > think that should be a separate effort, and it should be justified > with improved performance above and beyond what we get with Jason's > simd_get() stuff.
Last time I checked we had no very SIMD loops unless you count $ALG over 1 MiB data or so. And in that case you could use the kernel_fpu_begin()/end combo after a complete SIMD loop. I would like see that at least while going from one page to the next.
Sebastian
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