[libvirt] [PATCH 2/3] cgroup: Implement blkio.weight tuning API.

[Daniel P. Berrange]

On Sun, Jan 23, 2011 at 02:18:55PM +0800, Gui Jianfeng wrote:
> Implement blkio.weight tuning API.
> 
> Signed-off-by: Gui Jianfeng <guijianfeng at cn.fujitsu.com>
> ---
>  src/libvirt_private.syms |    2 ++
>  src/util/cgroup.c        |   36 ++++++++++++++++++++++++++++++++++++
>  src/util/cgroup.h        |    3 +++
>  3 files changed, 41 insertions(+), 0 deletions(-)
> 
> diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
> index 2ce4bed..97b9851 100644
> --- a/src/libvirt_private.syms
> +++ b/src/libvirt_private.syms
> @@ -77,6 +77,8 @@ virCgroupMounted;
>  virCgroupRemove;
>  virCgroupSetCpuShares;
>  virCgroupSetFreezerState;
> +virCgroupSetWeight;
> +virCgroupGetWeight;
>  virCgroupSetMemory;
>  virCgroupSetMemoryHardLimit;
>  virCgroupSetMemorySoftLimit;
> diff --git a/src/util/cgroup.c b/src/util/cgroup.c
> index 309f4e9..a3d3f29 100644
> --- a/src/util/cgroup.c
> +++ b/src/util/cgroup.c
> @@ -851,6 +851,42 @@ int virCgroupForDomain(virCgroupPtr driver ATTRIBUTE_UNUSED,
>  #endif
>  
>  /**
> + * virCgroupSetWeight:
> + *
> + * @group: The cgroup to change io weight for
> + * @weight: The Weight for this cgroup
> + *
> + * Returns: 0 on success
> + */
> +int virCgroupSetWeight(virCgroupPtr group, unsigned long weight)
> +{
> +    return virCgroupSetValueU64(group,
> +                                VIR_CGROUP_CONTROLLER_BLKIO,
> +                                "blkio.weight",
> +                                weight);
> +}
> +
> +/**
> + * virCgroupGetWeight:
> + *
> + * @group: The cgroup to get weight for
> + * @Weight: Pointer to returned weight
> + *
> + * Returns: 0 on success
> + */
> +int virCgroupGetWeight(virCgroupPtr group, unsigned long *weight)
> +{
> +    long long unsigned int __weight;
> +    int ret;
> +    ret = virCgroupGetValueU64(group,
> +                               VIR_CGROUP_CONTROLLER_BLKIO,
> +                               "blkio.weight", &__weight);
> +    if (ret == 0)
> +        *weight = (unsigned long) __weight;
> +    return ret;
> +}
> +
> +/**
>   * virCgroupSetMemory:
>   *
>   * @group: The cgroup to change memory for
> diff --git a/src/util/cgroup.h b/src/util/cgroup.h
> index 67b1299..99c1cfe 100644
> --- a/src/util/cgroup.h
> +++ b/src/util/cgroup.h
> @@ -41,6 +41,9 @@ int virCgroupForDomain(virCgroupPtr driver,
>  
>  int virCgroupAddTask(virCgroupPtr group, pid_t pid);
>  
> +int virCgroupSetWeight(virCgroupPtr group, unsigned long weight);
> +int virCgroupGetWeight(virCgroupPtr group, unsigned long *weight);
> +
>  int virCgroupSetMemory(virCgroupPtr group, unsigned long long kb);
>  int virCgroupGetMemoryUsage(virCgroupPtr group, unsigned long *kb);

ACK

Daniel