[libvirt] [PATCH RESEND RFC v4 2/6] cgroup: Implement cpu.cfs_period_us and cpu.cfs_quota_us tuning API

[Daniel P. Berrange]

On Thu, Jul 21, 2011 at 10:08:47AM +0800, Wen Congyang wrote:
> ---
>  src/libvirt_private.syms |    4 ++
>  src/util/cgroup.c        |   81 ++++++++++++++++++++++++++++++++++++++++++++--
>  src/util/cgroup.h        |    6 +++
>  3 files changed, 88 insertions(+), 3 deletions(-)

> +int virCgroupSetCpuCfsPeriod(virCgroupPtr group, unsigned long long cfs_period)
> +{
> +    /* The cfs_period shoule be greater or equal than 1ms, and less or equal
> +     * than 1s.
> +     */
> +    if (cfs_period < 1000 || cfs_period > 1000000)
> +        return -EINVAL;
> +
> +    return virCgroupSetValueU64(group,
> +                                VIR_CGROUP_CONTROLLER_CPU,
> +                                "cpu.cfs_period_us", cfs_period);
> +}

> +int virCgroupGetCpuCfsPeriod(virCgroupPtr group, unsigned long long *cfs_period)
> +{
> +    return virCgroupGetValueU64(group,
> +                                VIR_CGROUP_CONTROLLER_CPU,
> +                                "cpu.cfs_period_us", cfs_period);
> +}

BTW, what kernel version is required for this support ? In my Fedora 15
kernels I only see  rt_period_us, no cfs_period_us, and I can't find it
in the latest 3.0 kernel tree either ?

Daniel
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