Re: [Xen-devel] [RFC PATCH v2] tools: libxl/xl: run NUMA placement even when an hard-affinity is set

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Oct 19, 2018 at 05:54:41PM +0200, Dario Faggioli wrote:
> Right now, if either an hard or soft-affinity are explicitly specified
> in a domain's config file, automatic NUMA placement is skipped. However,
> automatic NUMA placement affects only the soft-affinity of the domain
> which is being created.
> 
> Therefore, it is ok to let it run if an hard-affinity is specified. The
> semantics will be that the best placement candidate would be found,
> respecting the specified hard-affinity, i.e., using only the nodes that
> contain the pcpus in the hard-affinity mask.
> 
> This is particularly helpful if global xl pinning masks are defined, as
> made possible by commit aa67b97ed34279c43 ("xl.conf: Add global affinity
> masks"). In fact, without this commit, defining a global affinity mask
> would also mean disabling automatic placement, but that does not
> necessarily have to be the case (especially in large systems).
> 
> Signed-off-by: Dario Faggioli <dfaggioli@xxxxxxxx>

Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>

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