On Mon, 2016-05-30 at 14:30 +0200, Paolo Bonzini wrote: > Thanks to all the work that was done by Andy Lutomirski and others, > enter_from_user_mode and prepare_exit_to_usermode are now called only > with > interrupts disabled. Let's provide them a version of > user_enter/user_exit > that skips saving and restoring the interrupt flag. > > On an AMD-based machine I tested this patch on, with force-enabled > context tracking, the speed-up in system calls was 90 clock cycles or > 6%, > measured with the following simple benchmark: >
Reviewed-by: Rik van Riel <[email protected]> -- All Rights Reversed.
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