Re: [Xen-devel] [PATCH v5 4/8] sysctl: Make XEN_SYSCTL_numainfo a little more efficient

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Thu, 2015-03-19 at 17:54 -0400, Boris Ostrovsky wrote:
> A number of changes to XEN_SYSCTL_numainfo interface:
> 
> * Make sysctl NUMA topology query use fewer copies by combining some
>   fields into a single structure and copying distances for each node
>   in a single copy.
> * NULL meminfo and distance handles are a request for maximum number
>   of nodes (num_nodes). If those handles are valid and num_nodes is
>   is smaller than the number of nodes in the system then -ENOBUFS is
>   returned (and correct num_nodes is provided)
> * Instead of using max_node_index for passing number of nodes keep this
>   value in num_nodes: almost all uses of max_node_index required adding
>   or subtracting one to eventually get to number of nodes anyway.
> * Replace INVALID_NUMAINFO_ID with XEN_INVALID_MEM_SZ and add
>   XEN_INVALID_NODE_DIST.
> 
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>

Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>



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