Messages in this thread | | | From | Kyle Huey <> | Date | Wed, 8 Mar 2017 14:07:00 -0800 | Subject | Re: [PATCH v2 0/3] x86/process: Optimize __switch_to_xtra() |
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On Tue, Feb 28, 2017 at 10:33 AM, Kyle Huey <me@kylehuey.com> wrote: > On Tue, Feb 14, 2017 at 12:11 AM, Kyle Huey <me@kylehuey.com> wrote: >> GCC generates lousy code in __switch_to_xtra. This patch series is an >> updated version of tglx's patches from last year >> (https://lkml.org/lkml/2016/12/15/432) that address review comments. >> >> Since v1: >> Part 1 - x86/process: Optimize TIF checks in __switch_to_xtra() >> - READ_ONCE annotations added as requested by Andy Lutomirski >> >> Part 2 - x86/process: Correct and optimize TIF_BLOCKSTEP switch >> - DEBUGCTLMSR_BTF is now modified when either the previous or >> next or both tasks use it, because the MSR is "highly magical". >> >> Part 3 - x86/process: Optimize TIF_NOTSC switch >> - Unchanged >> >> I didn't introduce a cpufeature for blockstep because that would >> add additional overhead compared to the existing code, where it's >> generally known at compile time that blockstep is supported. Perhaps >> we should just BUG_ON(!arch_has_block_step()) here if we really >> care to check anything. >> >> arch/x86/include/asm/msr-index.h | 1 + >> arch/x86/include/asm/tlbflush.h | 10 ++++++++++ >> arch/x86/kernel/process.c | 76 +++++++++++++++++++++++++++++++++++----------------------------------------- >> 3 files changed, 46 insertions(+), 41 deletions(-) >> > > Has anyone had a change to look at these?
Maybe now that the 4.11 merge window is closed? :)
- Kyle
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