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libxl: report numa sibling distances on host capabilities

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When running on a NUMA machine, populate the sibling node
and distance information using data supplied by Xen.

With locality distances information, under Xen, new host
capabilities would like:

    <topology>
      <cells num='4'>
        <cell id='0'>
          <memory unit='KiB'>263902380</memory>
          <distances>
            <sibling id='0' value='10'/>
            <sibling id='1' value='21'/>
          </distances>
          ...
        </cell>
        ...
      </cells>
      ...
    </topology>

Signed-off-by: Wim ten Have <wim.ten.have@oracle.com>
Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Jim Fehlig <jfehlig@suse.com>
This commit is contained in:
Wim ten Have 2017-05-09 20:06:29 +02:00 committed by Jim Fehlig
parent 4a1a4be37e
commit bf12395230
1 changed files with 17 additions and 2 deletions
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19
src/libxl/libxl_capabilities.c
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@ -247,8 +247,9 @@ libxlCapsInitNuma(libxl_ctx *ctx, virCapsPtr caps)
{
libxl_numainfo *numa_info = NULL;
libxl_cputopology *cpu_topo = NULL;
int nr_nodes = 0, nr_cpus = 0;
int nr_nodes = 0, nr_cpus = 0, nr_siblings = 0;
virCapsHostNUMACellCPUPtr *cpus = NULL;
virCapsHostNUMACellSiblingInfoPtr siblings = NULL;
int *nr_cpus_node = NULL;
size_t i;
int ret = -1;
@ -322,10 +323,23 @@ libxlCapsInitNuma(libxl_ctx *ctx, virCapsPtr caps)
if (numa_info[i].size == LIBXL_NUMAINFO_INVALID_ENTRY)
continue;
nr_siblings = numa_info[i].num_dists;
if (nr_siblings) {
size_t j;
if (VIR_ALLOC_N(siblings, nr_siblings) < 0)
goto cleanup;
for (j = 0; j < nr_siblings; j++) {
siblings[j].node = j;
siblings[j].distance = numa_info[i].dists[j];
}
}
if (virCapabilitiesAddHostNUMACell(caps, i,
numa_info[i].size / 1024,
nr_cpus_node[i], cpus[i],
0, NULL,
nr_siblings, siblings,
0, NULL) < 0) {
virCapabilitiesClearHostNUMACellCPUTopology(cpus[i],
nr_cpus_node[i]);
@ -343,6 +357,7 @@ libxlCapsInitNuma(libxl_ctx *ctx, virCapsPtr caps)
for (i = 0; cpus && i < nr_nodes; i++)
VIR_FREE(cpus[i]);
virCapabilitiesFreeNUMAInfo(caps);
VIR_FREE(siblings);
}
VIR_FREE(cpus);