Re: [Xen-devel] [PATCH 3 of 4] Extend cpupools to support numa

[Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>]

On 12/08/10 11:58, Ian Campbell wrote:
> See previous comments about the interface to libxl_get_topoplogy and
> leaking the returned pointer value.
>
> On Fri, 2010-11-26 at 07:10 +0000, Juergen Gross wrote:
> > +    if (libxl_get_freecpus(&ctx,&freemap)) {
> > +        fprintf(stderr, "libxl_get_freecpus failed\n");
> > +        return -ERROR_FAIL;
> > +    }
> > +
> > +    topology = libxl_get_topologyinfo(&ctx);
> > +    if (topology == NULL) {
> > +        fprintf(stderr, "libxl_get_topologyinfo failed\n");
> > +        return -ERROR_FAIL;
> > +    }
> > +
> > +    n = 0;
> > +    for (cpu = 0; cpu<  topology->nodemap.entries; cpu++) {
> > +        if (libxl_cpumap_test(&freemap, cpu)&&
> > +            (topology->nodemap.array[cpu] == node)&&
> > +            !libxl_cpupool_cpuadd(&ctx, poolid, cpu)) {
> > +                n++;
> > +        }
> > +    }
> This sequence of actions look like they would make a useful addition to
> the libxl interface as a helper function.
>
> Not sure what it would be called, perhaps:
>         libxl_cpupool_cpuadd_node(&ctx, poolid, node)
> ?
Okay.

> > +    for (p = 0; p<  n_pools; p++) {
> > +        if (poolinfo[p].poolid == poolid) {
> > +            for (cpu = 0; cpu<  topology->nodemap.entries; cpu++) {
> > +                if ((topology->nodemap.array[cpu] == node)&&
> > +                    libxl_cpumap_test(&poolinfo[p].cpumap, cpu)&&
> > +                    !libxl_cpupool_cpuremove(&ctx, poolid, cpu)) {
> > +                        n++;
> > +                }
> > +            }
> > +        }
> > +    }
> also a helper function?
>
> libxl_cpupool_cpuremove_node(&ctx, poolid, node)
Okay.

> Isn't there an existing function to find a poolinfo from a poolid? (if
> not then should there be?)
Currently it is only possible to get infos for ALL cpupools. As the
number of cpupools is expected to be not very large, this should be no
problem.
Perhaps it would make sense to create a helper function to locate the correct
poolinfo member based on the poolid.


Juergen

--
Juergen Gross                 Principal Developer Operating Systems
TSP ES&S SWE OS6                       Telephone: +49 (0) 89 3222 2967
Fujitsu Technology Solutions              e-mail: juergen.gross@xxxxxxxxxxxxxx
Domagkstr. 28                           Internet: ts.fujitsu.com
D-80807 Muenchen                 Company details: ts.fujitsu.com/imprint.html

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