On Mon, Oct 08, 2012 at 02:55:25AM -0500, Abhishek Gupta wrote: > Hi, > > I am trying to get the steal time with 2 VMs (each with 1 Vcpu) pinned > to same core. > > While finding documentation on this, I came across your patches and > posts related to the implementation of this feature, so I thought it > would be best to ask you. > > I run the same application on these 2 VMs simultaneously and see the > performance difference. I am trying to read the steal time from inside > the guest using top, vmstat etc. > > Both, top and vmstat -s report the steal time (st) as 0. I also > checked that procps is in latest version. I am using virtio-net. I > suspect that the steal time is not being updated well. Is there > something which I need to configure for this to work? My Linux version > for guest image is: > > Linux server-147 2.6.35-24-virtual #42-Ubuntu SMP Thu Dec 2 05:15:26 > UTC 2010 x86_64 GNU/Linux > > And /proc/cpuinfo shows i: > > processor : 0 > vendor_id : GenuineIntel > cpu family : 6 > model : 2 > model name : QEMU Virtual CPU version 0.14.0 > stepping : 3 > cpu MHz : 2992.498 > cache size : 4096 KB > fpu : yes > fpu_exception : yes > cpuid level : 4 > wp : yes > flags : fpu de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov > pse36 clflush mmx fxsr sse sse2 syscall nx lm up rep_good pni cx16 > hypervisor lahf_lm bogomips : 5984.99 > clflush size : 64 > cache_alignment : 64 > address sizes : 40 bits physical, 48 bits virtual > power management: > > > Another question I had was that is there a way to programmatically get > the value of steal cycles (e.g. from a C program) ? > Thanks, > > Abhishek Make sure CONFIG_SCHEDSTATS is enabled in your host kernel. > On Monday, June 13, 2011 6:40:02 PM UTC-5, Glauber Costa wrote: > > Hi, > > > > This series is a repost of the last series I posted about this. > > It tries to address most concerns that were raised at the time, > > plus makes uses of the static_branch interface to disable the > > steal code when not in use. > > > > > > Glauber Costa (7): > > KVM-HDR Add constant to represent KVM MSRs enabled bit > > KVM-HDR: KVM Steal time implementation > > KVM-HV: KVM Steal time implementation > > KVM-GST: Add a pv_ops stub for steal time > > KVM-GST: KVM Steal time accounting > > KVM-GST: adjust scheduler cpu power > > KVM-GST: KVM Steal time registration > > > > Documentation/kernel-parameters.txt | 4 ++ > > Documentation/virtual/kvm/msr.txt | 33 +++++++++++++ > > arch/x86/Kconfig | 12 +++++ > > arch/x86/include/asm/kvm_host.h | 8 +++ > > arch/x86/include/asm/kvm_para.h | 15 ++++++ > > arch/x86/include/asm/paravirt.h | 9 ++++ > > arch/x86/include/asm/paravirt_types.h | 1 + > > arch/x86/kernel/kvm.c | 72 +++++++++++++++++++++++++++++ > > arch/x86/kernel/kvmclock.c | 2 + > > arch/x86/kernel/paravirt.c | 9 ++++ > > arch/x86/kvm/x86.c | 60 +++++++++++++++++++++++- > > kernel/sched.c | 81 +++++++++++++++++++++++++++++---- > > kernel/sched_features.h | 4 +- > > 13 files changed, 296 insertions(+), 14 deletions(-) > > > > -- > > 1.7.3.4 > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > Please read the FAQ at http://www.tux.org/lkml/ > > > > On Monday, June 13, 2011 6:40:02 PM UTC-5, Glauber Costa wrote: > > Hi, > > > > This series is a repost of the last series I posted about this. > > It tries to address most concerns that were raised at the time, > > plus makes uses of the static_branch interface to disable the > > steal code when not in use. > > > > > > Glauber Costa (7): > > KVM-HDR Add constant to represent KVM MSRs enabled bit > > KVM-HDR: KVM Steal time implementation > > KVM-HV: KVM Steal time implementation > > KVM-GST: Add a pv_ops stub for steal time > > KVM-GST: KVM Steal time accounting > > KVM-GST: adjust scheduler cpu power > > KVM-GST: KVM Steal time registration > > > > Documentation/kernel-parameters.txt | 4 ++ > > Documentation/virtual/kvm/msr.txt | 33 +++++++++++++ > > arch/x86/Kconfig | 12 +++++ > > arch/x86/include/asm/kvm_host.h | 8 +++ > > arch/x86/include/asm/kvm_para.h | 15 ++++++ > > arch/x86/include/asm/paravirt.h | 9 ++++ > > arch/x86/include/asm/paravirt_types.h | 1 + > > arch/x86/kernel/kvm.c | 72 +++++++++++++++++++++++++++++ > > arch/x86/kernel/kvmclock.c | 2 + > > arch/x86/kernel/paravirt.c | 9 ++++ > > arch/x86/kvm/x86.c | 60 +++++++++++++++++++++++- > > kernel/sched.c | 81 +++++++++++++++++++++++++++++---- > > kernel/sched_features.h | 4 +- > > 13 files changed, 296 insertions(+), 14 deletions(-) > > > > -- > > 1.7.3.4 > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > Please read the FAQ at http://www.tux.org/lkml/ > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
