[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] cpufreq status information
>>> "Tian, Kevin" <kevin.tian@xxxxxxxxx> 08.09.08 15:50 >>> >>From: Jan Beulich [mailto:jbeulich@xxxxxxxxxx] >>How? I can't see where the current frequency a CPU is running at >>is being exposed. > >common/sysctl.c: XEN_SYSCTL_get_pmstat Ah, okay, I missed that. But - I can't use this from the kernel anyway, and tools that track the frequency (i.e. KDE sysguard) would need to be modified in order to make use of this. I'd really prefer /proc/cpuinfo to correctly reflect this at least in Dom0. And even beyond that - I can't seem to find any users of the APIs in tools/libxc/xc_pm.c, so these really appear to be dead stubs. >Then you have to pin dom0 vCPU to corresponding pCPU, and have >dom0 with same number as pCPU. I don't think such limitation >necessary for just retrieving some pCPU information. > >Or if you still enable vcpu migration, you have to fake virtual freq >change notification within dom0 at vcpu migration as pCPU may >scale its own freq individually. Why? All I care about is a snapshot value. It doesn't matter whether it's stale by the time I get it, there's nothing going to be calculated from it, apart from statistics. Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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