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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [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@xxxxxxxxxx>) pointed by Stephan Diestelhorst <stephan.diestelhorst@xxxxxxx> - 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(-) --- _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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