Re: [Xen-devel] [PATCH RESEND 09/12] libxc: numa-sched: enable getting/specifying per-vcpu node-affinity

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, Nov 05, 2013 at 03:35:42PM +0100, Dario Faggioli wrote:
> by providing the proper get/set interfaces and wiring them
> to the new domctl-s from the previous commit.

s/previous commit/<title of the commit>/

> 
> Signed-off-by: Dario Faggioli <dario.faggioli@xxxxxxxxxx>
> ---
>  tools/libxc/xc_domain.c |   82 
> +++++++++++++++++++++++++++++++++++++++++++++++
>  tools/libxc/xenctrl.h   |   19 +++++++++++
>  2 files changed, 101 insertions(+)
> 
> diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c
> index f8825a3..e44ad2e 100644
> --- a/tools/libxc/xc_domain.c
> +++ b/tools/libxc/xc_domain.c
> @@ -272,6 +272,88 @@ out:
>      return ret;
>  }
>  
> +int xc_vcpu_setnodeaffinity(xc_interface *xch,
> +                            uint32_t domid,
> +                            int vcpu,
> +                            xc_nodemap_t nodemap)
> +{
> +    DECLARE_DOMCTL;
> +    DECLARE_HYPERCALL_BUFFER(uint8_t, local);
> +    int ret = -1;

Ewww.. Could we just use regular -Exx for new xc_* calls?

> +    int nodesize;
> +
> +    nodesize = xc_get_cpumap_size(xch);
> +    if (!nodesize)
> +    {
> +        PERROR("Could not get number of  nodes");

Extra space.
> +        goto out;
> +    }
> +
> +    local = xc_hypercall_buffer_alloc(xch, local, nodesize);
> +    if ( local == NULL )
> +    {
> +        PERROR("Could not allocate memory for setvcpunodeaffinity domctl 
> hypercall");
> +        goto out;
> +    }
> +
> +    domctl.cmd = XEN_DOMCTL_setvcpunodeaffinity;
> +    domctl.domain = (domid_t)domid;
> +    domctl.u.vcpuaffinity.vcpu = vcpu;
> +
> +    memcpy(local, nodemap, nodesize);
> +
> +    set_xen_guest_handle(domctl.u.vcpuaffinity.map.bitmap, local);
> +
> +    domctl.u.vcpuaffinity.map.nr_bits = nodesize * 8;
> +
> +    ret = do_domctl(xch, &domctl);
> +
> +    xc_hypercall_buffer_free(xch, local);
> +
> + out:
> +    return ret;
> +}
> +
> +int xc_vcpu_getnodeaffinity(xc_interface *xch,
> +                            uint32_t domid,
> +                            int vcpu,
> +                            xc_nodemap_t nodemap)
> +{
> +    DECLARE_DOMCTL;
> +    DECLARE_HYPERCALL_BUFFER(uint8_t, local);
> +    int ret = -1;
> +    int nodesize;
> +
> +    nodesize = xc_get_nodemap_size(xch);
> +    if (!nodesize)
> +    {
> +        PERROR("Could not get number of nodes");
> +        goto out;
> +    }
> +
> +    local = xc_hypercall_buffer_alloc(xch, local, nodesize);
> +    if (local == NULL)
> +    {
> +        PERROR("Could not allocate memory for getvcpunodeaffinity domctl 
> hypercall");
> +        goto out;
> +    }
> +
> +    domctl.cmd = XEN_DOMCTL_getvcpunodeaffinity;
> +    domctl.domain = (domid_t)domid;
> +    domctl.u.vcpuaffinity.vcpu = vcpu;
> +
> +    set_xen_guest_handle(domctl.u.vcpuaffinity.map.bitmap, local);
> +    domctl.u.vcpuaffinity.map.nr_bits = nodesize * 8;

Could the 8 be replaced by a sizeof?
> +
> +    ret = do_domctl(xch, &domctl);
> +
> +    memcpy(nodemap, local, nodesize);
> +
> +    xc_hypercall_buffer_free(xch, local);
> +out:
> +    return ret;
> +}
> +
>  int xc_domain_get_guest_width(xc_interface *xch, uint32_t domid,
>                                unsigned int *guest_width)
>  {
> diff --git a/tools/libxc/xenctrl.h b/tools/libxc/xenctrl.h
> index 8cf3f3b..208fa2c 100644
> --- a/tools/libxc/xenctrl.h
> +++ b/tools/libxc/xenctrl.h
> @@ -551,6 +551,25 @@ int xc_domain_node_getaffinity(xc_interface *xch,
>                                 uint32_t domind,
>                                 xc_nodemap_t nodemap);
>  
> +/**
> + * These functions set and retrieves the NUMA node-affinity
> + * of a specific vcpu.
> + *
> + * @parm xch a handle to an open hypervisor interface.
> + * @parm domid the domain id one is interested in.
> + * @parm vcpu the vcpu one wants to set/get the affinity of.
> + * @parm nodemap the map of the affine nodes.
> + * @return 0 on success, -1 on failure.

and something in errno?
> + */
> +int xc_vcpu_setnodeaffinity(xc_interface *xch,
> +                            uint32_t domid,
> +                            int vcpu,
> +                            xc_nodemap_t nodemap);
> +int xc_vcpu_getnodeaffinity(xc_interface *xch,
> +                            uint32_t domid,
> +                            int vcpu,
> +                            xc_nodemap_t nodemap);
> +
>  int xc_vcpu_setaffinity(xc_interface *xch,
>                          uint32_t domid,
>                          int vcpu,
> 
> 
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