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    Subject[PATCH RFC V2 0/5] kvm : Paravirt-spinlock support for KVM guests
    The 5-patch series to follow this email extends KVM-hypervisor and Linux guest 
    running on KVM-hypervisor to support pv-ticket spinlocks, based heavily on Xen's implementation.

    Two hypercalls are being introduced in KVM hypervisor, one that allows a
    vcpu (spinning on a lock) to block and another that allows a vcpu to kick
    another out of blocking state.

    This is discussed in : (posted by Srivatsa V).
    https://lkml.org/lkml/2010/7/26/24
    https://lkml.org/lkml/2011/1/19/212

    The BASE patch is tip rc9 + Jeremy's following patches.
    compare exchange (https://lkml.org/lkml/2011/8/29/321),
    xadd (https://lkml.org/lkml/2011/10/4/328)
    x86/ticketlocklock (https://lkml.org/lkml/2011/10/12/496).

    Changes since last posting:
    - rebased patchesto -rc9
    - synchronization related changes based on Jeremy's changes (Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>) pointed by
    Stephan Diestelhorst <stephan.diestelhorst@amd.com>
    - enabling 32 bit guests
    - splitted patches into two more chunks

    Results:

    set up :
    Kernel for host/guest : 3.1-rc9 + Jeremys ticketlock cleanup, xadd, pv spinlock patches as BASE

    3 guests with 8VCPU, 4GB RAM, 1 used for kernbench (kernbench -f -H -M -o 20) other for cpuhog (shell script while
    true with an instruction)

    scenario A: unpinned
    scenario B: each vcpu pinned to corresponding cpu

    1x: no hogs
    2x: 8hogs in one guest
    3x: 8hogs each in two guest

    Result for Non PLE machine :
    Machine : IBM xSeries with Intel(R) Xeon(R) x5570 2.93GHz CPU with 8 core , 64GB RAM
    BASE BASE+patch %improvement
    mean (sd) mean (sd)
    Scenario A:
    case 1x: 157.495 (15.2924) 148.355 (7.35479) 5.80336
    case 2x: 761.955 (581.384) 247.306 (64.4707) 67.5432
    case 3x: 2804.36 (2613.57) 261.522 (85.0856) 90.6744

    Scenario B
    case 1x: 1241.86 (812.155) 313.805 (140.99) 74.731
    case 2x: 1277.32 (771.316) 308.325 (124.808) 75.8616
    case 3x: 1239.45 (860.012) 307.535 (124.243) 75.1878

    Result for PLE machine:
    Machine : IBM xSeries with Intel(R) Xeon(R) X7560 2.27GHz CPU with 32/64 core, with 8
    online cores and 4*64GB RAM

    BASE BASE+patch %improvement
    mean (sd) mean (sd)
    Scenario A:
    case 1x: 72.7133 (43.7109) 70.0734 (37.7866) 3.63056
    case 2x: 124.138 (79.9515) 119.28 (81.3597) 3.91339
    case 3x: 174.561 (132.209) 159.283 (116.232) 8.75224

    Scenario B
    case 1x: 166.101 (119.313) 160.056 (117.446) 3.63935
    case 2x: 167.421 (120.767) 158.133 (115.022) 5.54769
    case 3x: 169.317 (122.088) 159.353 (116.737) 5.88482

    Srivatsa Vaddagiri, Suzuki Poulose, Raghavendra K T (5):
    Add debugfs support to print u32-arrays in debugfs
    Renaming of xen functions and change unsigned to u32
    Add two hypercalls to KVM hypervisor to support pv-ticketlocks
    Added configuration support to enable debug information for KVM Guests
    pv-ticketlocks support for linux guests running on KVM hypervisor

    arch/x86/Kconfig | 9 ++
    arch/x86/include/asm/kvm_para.h | 12 ++-
    arch/x86/kernel/head32.c | 3 +
    arch/x86/kernel/head64.c | 3 +
    arch/x86/kernel/kvm.c | 247 +++++++++++++++++++++++++++++++++++++++
    arch/x86/kvm/x86.c | 67 +++++++++++-
    arch/x86/xen/debugfs.c | 104 ----------------
    arch/x86/xen/debugfs.h | 4 -
    arch/x86/xen/spinlock.c | 2 +-
    fs/debugfs/file.c | 108 +++++++++++++++++
    include/linux/debugfs.h | 11 ++
    include/linux/kvm.h | 1 +
    include/linux/kvm_host.h | 5 +
    include/linux/kvm_para.h | 2 +
    virt/kvm/kvm_main.c | 1 +
    15 files changed, 468 insertions(+), 111 deletions(-)
    ---


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