> -----Original Message----- > From: Vitaly Kuznetsov [mailto:vkuznets@xxxxxxxxxx] > Sent: Friday, April 7, 2017 4:27 AM > To: devel@xxxxxxxxxxxxxxxxxxxxxx; x86@xxxxxxxxxx > Cc: linux-kernel@xxxxxxxxxxxxxxx; KY Srinivasan <kys@xxxxxxxxxxxxx>; > Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>; Stephen Hemminger > <sthemmin@xxxxxxxxxxxxx>; Thomas Gleixner <tglx@xxxxxxxxxxxxx>; Ingo > Molnar <mingo@xxxxxxxxxx>; H. Peter Anvin <hpa@xxxxxxxxx>; Steven > Rostedt <rostedt@xxxxxxxxxxx>; Jork Loeser <Jork.Loeser@xxxxxxxxxxxxx> > Subject: [PATCH 0/7] Hyper-V: praravirtualized remote TLB flushing and > hypercall improvements > > Hi, > > 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 3m44.994s > user 0m3.829s > sys 3m36.323s > > After: > # time ./pthread_mmap ./randfile > real 2m57.145s > user 0m3.797s > sys 2m34.812s > > 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). Thanks Vitaly. We are currently testing these patches on Azure and other Hyper-V platforms and will report back. K. Y > > Vitaly Kuznetsov (7): > x86/hyperv: make hv_do_hypercall() inline > x86/hyper-v: fast hypercall implementation > hyper-v: use fast hypercall for HVCALL_SIGNAL_EVENT > x86/hyperv: implement rep hypercalls > hyper-v: globalize vp_index > x86/hyper-v: use hypercall for remove TLB flush > tracing/hyper-v: trace hyperv_mmu_flush_tlb_others() > > MAINTAINERS | 1 + > arch/x86/hyperv/Makefile | 2 +- > arch/x86/hyperv/hv_init.c | 90 +++++++++++-------------- > arch/x86/hyperv/mmu.c | 134 > +++++++++++++++++++++++++++++++++++++ > arch/x86/include/asm/mshyperv.h | 131 > ++++++++++++++++++++++++++++++++++++ > arch/x86/include/uapi/asm/hyperv.h | 26 +++++++ > arch/x86/kernel/cpu/mshyperv.c | 1 + > drivers/hv/channel_mgmt.c | 22 +++--- > drivers/hv/connection.c | 8 ++- > drivers/hv/hv.c | 9 --- > drivers/hv/hyperv_vmbus.h | 11 --- > drivers/hv/vmbus_drv.c | 17 ----- > include/linux/hyperv.h | 21 +++--- > include/trace/events/hyperv.h | 30 +++++++++ > 14 files changed, 386 insertions(+), 117 deletions(-) > create mode 100644 arch/x86/hyperv/mmu.c > create mode 100644 include/trace/events/hyperv.h > > -- > 2.9.3 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
