From: K. Y. Srinivasan <k...@microsoft.com> Hyper-V supports hypercalls for doing local and remote TLB flushing and gives its guests hints when using hypercall is preferred. While doing hypercalls for local TLB flushes is probably not practical (and is not being suggested by modern Hyper-V versions) remote TLB flush with a hypercall brings significant improvement.
To test the series I wrote a special 'TLB trasher': on a 16 vCPU guest I was creating 32 threads which were doing 100000 mmap/munmaps each on some big file. Here are the results: Before: # time ./pthread_mmap ./randfile real 3m33.118s user 0m3.698s sys 3m16.624s After: # time ./pthread_mmap ./randfile real 2m19.920s user 0m2.662s sys 2m9.948s This series brings a number of small improvements along the way: fast hypercall implementation and using it for event signaling, rep hypercalls implementation, hyperv tracing subsystem (which only traces the newly added remote TLB flush for now). Vitaly Kuznetsov (10): x86/hyper-v: include hyperv/ only when CONFIG_HYPERV is set x86/hyper-v: stash the max number of virtual/logical processor x86/hyper-v: make hv_do_hypercall() inline x86/hyper-v: fast hypercall implementation hyper-v: use fast hypercall for HVCALL_SIGNAL_EVENT x86/hyper-v: implement rep hypercalls hyper-v: globalize vp_index x86/hyper-v: use hypercall for remote TLB flush x86/hyper-v: support extended CPU ranges for TLB flush hypercalls tracing/hyper-v: trace hyperv_mmu_flush_tlb_others() MAINTAINERS | 1 + arch/x86/Kbuild | 2 +- arch/x86/hyperv/Makefile | 2 +- arch/x86/hyperv/hv_init.c | 90 +++++------- arch/x86/hyperv/mmu.c | 268 +++++++++++++++++++++++++++++++++++ arch/x86/include/asm/mshyperv.h | 149 +++++++++++++++++++- arch/x86/include/asm/trace/hyperv.h | 38 +++++ arch/x86/include/uapi/asm/hyperv.h | 17 +++ arch/x86/kernel/cpu/mshyperv.c | 13 ++- drivers/hv/channel_mgmt.c | 20 +-- drivers/hv/connection.c | 7 +- drivers/hv/hv.c | 9 -- drivers/hv/hyperv_vmbus.h | 11 -- drivers/hv/vmbus_drv.c | 17 --- drivers/pci/host/pci-hyperv.c | 10 +- include/linux/hyperv.h | 17 +-- 16 files changed, 540 insertions(+), 131 deletions(-) create mode 100644 arch/x86/hyperv/mmu.c create mode 100644 arch/x86/include/asm/trace/hyperv.h _______________________________________________ devel mailing list de...@linuxdriverproject.org http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
