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 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
