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SubjectRE: [PATCH 0/7] Hyper-V: praravirtualized remote TLB flushing and hypercall improvements
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> -----Original Message-----
> From: Vitaly Kuznetsov [mailto:vkuznets@redhat.com]
> Sent: Friday, April 7, 2017 4:27 AM
> To: devel@linuxdriverproject.org; x86@kernel.org
> Cc: linux-kernel@vger.kernel.org; KY Srinivasan <kys@microsoft.com>;
> Haiyang Zhang <haiyangz@microsoft.com>; Stephen Hemminger
> <sthemmin@microsoft.com>; Thomas Gleixner <tglx@linutronix.de>; Ingo
> Molnar <mingo@redhat.com>; H. Peter Anvin <hpa@zytor.com>; Steven
> Rostedt <rostedt@goodmis.org>; Jork Loeser <Jork.Loeser@microsoft.com>
> 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

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