| Date | Wed, 30 Jan 2019 12:35:55 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH v6] x86: load FPU registers on return to userland |
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On Wed, Jan 09, 2019 at 12:47:22PM +0100, Sebastian Andrzej Siewior wrote: > This is a refurbished series originally started by by Rik van Riel. The > goal is load the FPU registers on return to userland and not on every > context switch. By this optimisation we can: > - avoid loading the registers if the task stays in kernel and does > not return to userland > - make kernel_fpu_begin() cheaper: it only saves the registers on the > first invocation. The second invocation does not need save them again.
Btw, do we have any benchmark data showing the improvement this brings?
-- Regards/Gruss, Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
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