This patch series is meant to address several issues I encountered with VM translations on x86_64. In my testing I found that swiotlb was incurring up to a 5% processing overhead due to calls to __phys_addr. To address that I have updated swiotlb to use physical addresses instead of virtual addresses to reduce the need to call __phys_addr. However those patches didn't address the other callers. With these patches applied I am able to achieve an additional 1% to 2% performance gain on top of the changes to swiotlb.
The first 2 patches are the performance optimizations that result in the 1% to 2% increase in overall performance. The remaining patches are various cleanups for a number of spots where __pa or virt_to_phys was being called and was not needed or __pa_symbol could have been used. --- Alexander Duyck (8): x86/lguest: Use __pa_symbol instead of __pa on C visible symbols x86/acpi: Use __pa_symbol instead of __pa on C visible symbols x86/xen: Use __pa_symbol instead of __pa on C visible symbols x86/ftrace: Use __pa_symbol instead of __pa on C visible symbols x86: Use __pa_symbol instead of __pa on C visible symbols x86: Drop 4 unnecessary calls to __pa_symbol x86: Make it so that __pa_symbol can only process kernel symbols on x86_64 x86: Improve __phys_addr performance by making use of carry flags and inlining arch/x86/include/asm/page.h | 3 ++- arch/x86/include/asm/page_32.h | 1 + arch/x86/include/asm/page_64_types.h | 20 +++++++++++++++++-- arch/x86/kernel/acpi/sleep.c | 2 +- arch/x86/kernel/cpu/intel.c | 2 +- arch/x86/kernel/ftrace.c | 4 ++-- arch/x86/kernel/head32.c | 4 ++-- arch/x86/kernel/head64.c | 4 ++-- arch/x86/kernel/setup.c | 16 ++++++++-------- arch/x86/kernel/x8664_ksyms_64.c | 3 +++ arch/x86/lguest/boot.c | 3 ++- arch/x86/mm/pageattr.c | 8 ++++---- arch/x86/mm/physaddr.c | 35 ++++++++++++++++++++++++++++------ arch/x86/platform/efi/efi.c | 4 ++-- arch/x86/realmode/init.c | 8 ++++---- arch/x86/xen/mmu.c | 19 ++++++++++-------- 16 files changed, 91 insertions(+), 45 deletions(-) -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/