Re: [libvirt] [PATCH v2] libxl: report numa sibling distances on host capabilities

From: Wim ten Have <wim.ten.have(a)oracle.com&gt; 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(a)oracle.com&gt;

src/libxl/libxl_capabilities.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/src/libxl/libxl_capabilities.c b/src/libxl/libxl_capabilities.c index 839a2ee..e095920 100644 --- a/src/libxl/libxl_capabilities.c +++ b/src/libxl/libxl_capabilities.c @@ -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);