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Groups > linux.kernel > #1411300
| From | Rik van Riel <riel@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 1/2] x86/entry: Avoid interrupt flag save and restore |
| Date | 2016-06-01 17:00 +0200 |
| Message-ID | <rFfMK-1eo-35@gated-at.bofh.it> (permalink) |
| References | <rEuE9-4bg-3@gated-at.bofh.it> <rEuE9-4bg-1@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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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 <riel@redhat.com> -- All Rights Reversed.
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Re: [PATCH 1/2] x86/entry: Avoid interrupt flag save and restore Rik van Riel <riel@redhat.com> - 2016-06-01 17:00 +0200
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