On Fri, 9 Jun 2017 15:27:26 +0200 Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> wrote: > Changes since v7: > - Minor code style fixes (drop explicit casting, reformat code a bit) > in PATCH3 and PATCH9 [Andy Shevchenko] > > Original description: > > 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 | 148 +++++++++++++++++++- > 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, 539 insertions(+), 131 deletions(-) > create mode 100644 arch/x86/hyperv/mmu.c > create mode 100644 arch/x86/include/asm/trace/hyperv.h > Looks good. Reviewed-by: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx> _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
