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conf: Deduplicate NUMA distance code 

After previous patches we have two structures:
virCapsHostNUMACellDistance and virNumaDistance which express the
same thing. And have the exact same members (modulo their names).
Drop the former in favor of the latter.

This change means that distances with value of 0 are no longer
printed out into capabilities XML, because domain XML code allows
partial distance specification and thus threats value of 0 as
unspecified by user (see virDomainNumaGetNodeDistance() which
returns the default LOCAL/REMOTE distance for value of 0).

Also, from ACPI 6.1 specification, section 5.2.17 System Locality
Distance Information Table (SLIT):

  Distance values of 0-9 are reserved and have no meaning.

Thus we shouldn't be ever reporting 0 in neither domain nor
capabilities XML.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
This commit is contained in:
Michal Privoznik 2021-05-03 11:04:45 +02:00
parent 773118632e
commit 4b3dc045b9
5 changed files with 18 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
docs/schemas/capability.rng
View File

@ -157,16 +157,9 @@
<optional>
<element name="distances">
<zeroOrMore>
<element name="sibling">
<attribute name="id">
<ref name="unsignedInt"/>
</attribute>
<attribute name="value">
<ref name="unsignedInt"/>
</attribute>
</element>
</zeroOrMore>
<oneOrMore>
<ref name="numaDistance"/>
</oneOrMore>
</element>
</optional>

26
src/conf/capabilities.c
View File

@ -349,7 +349,7 @@ virCapabilitiesHostNUMAAddCell(virCapsHostNUMA *caps,
int ncpus,
virCapsHostNUMACellCPU **cpus,
int ndistances,
virCapsHostNUMACellDistance **distances,
virNumaDistance **distances,
int npageinfo,
virCapsHostNUMACellPageInfo **pageinfo)
{
@ -833,17 +833,7 @@ virCapabilitiesHostNUMAFormat(virBuffer *buf,
cell->pageinfo[j].avail);
}
if (cell->ndistances) {
virBufferAddLit(buf, "<distances>\n");
virBufferAdjustIndent(buf, 2);
for (j = 0; j < cell->ndistances; j++) {
virBufferAsprintf(buf, "<sibling id='%d' value='%d'/>\n",
cell->distances[j].node,
cell->distances[j].distance);
}
virBufferAdjustIndent(buf, -2);
virBufferAddLit(buf, "</distances>\n");
}
virNumaDistanceFormat(buf, cell->distances, cell->ndistances);
virBufferAsprintf(buf, "<cpus num='%d'>\n", cell->ncpus);
virBufferAdjustIndent(buf, 2);
@ -1457,10 +1447,10 @@ virCapabilitiesFillCPUInfo(int cpu_id G_GNUC_UNUSED,
static int
virCapabilitiesGetNUMADistances(int node,
virCapsHostNUMACellDistance **distancesRet,
virNumaDistance **distancesRet,
int *ndistancesRet)
{
virCapsHostNUMACellDistance *tmp = NULL;
virNumaDistance *tmp = NULL;
int tmp_size = 0;
int ret = -1;
int *distances = NULL;
@ -1476,14 +1466,14 @@ virCapabilitiesGetNUMADistances(int node,
return 0;
}
tmp = g_new0(virCapsHostNUMACellDistance, ndistances);
tmp = g_new0(virNumaDistance, ndistances);
for (i = 0; i < ndistances; i++) {
if (!distances[i])
continue;
tmp[tmp_size].node = i;
tmp[tmp_size].distance = distances[i];
tmp[tmp_size].cellid = i;
tmp[tmp_size].value = distances[i];
tmp_size++;
}
@ -1607,7 +1597,7 @@ virCapabilitiesHostNUMAInitReal(virCapsHostNUMA *caps)
for (n = 0; n <= max_node; n++) {
g_autoptr(virBitmap) cpumap = NULL;
g_autofree virCapsHostNUMACellDistance *distances = NULL;
g_autofree virNumaDistance *distances = NULL;
int ndistances = 0;
g_autofree virCapsHostNUMACellPageInfo *pageinfo = NULL;
int npageinfo;

11
src/conf/capabilities.h
View File

@ -94,11 +94,6 @@ struct _virCapsHostNUMACellCPU {
virBitmap *siblings;
};
struct _virCapsHostNUMACellDistance {
int node; /* foreign NUMA node */
unsigned int distance; /* distance to the node */
};
struct _virCapsHostNUMACellPageInfo {
unsigned int size; /* page size in kibibytes */
unsigned long long avail; /* the size of pool */
@ -109,8 +104,8 @@ struct _virCapsHostNUMACell {
int ncpus;
unsigned long long mem; /* in kibibytes */
virCapsHostNUMACellCPU *cpus;
int ndistances;
virCapsHostNUMACellDistance *distances;
size_t ndistances;
virNumaDistance *distances;
int npageinfo;
virCapsHostNUMACellPageInfo *pageinfo;
};
@ -256,7 +251,7 @@ virCapabilitiesHostNUMAAddCell(virCapsHostNUMA *caps,
int ncpus,
virCapsHostNUMACellCPU **cpus,
int ndistances,
virCapsHostNUMACellDistance **distances,
virNumaDistance **distances,
int npageinfo,
virCapsHostNUMACellPageInfo **pageinfo);

2
src/conf/virconftypes.h
View File

@ -60,8 +60,6 @@ typedef struct _virCapsHostNUMACellCPU virCapsHostNUMACellCPU;
typedef struct _virCapsHostNUMACellPageInfo virCapsHostNUMACellPageInfo;
typedef struct _virCapsHostNUMACellDistance virCapsHostNUMACellDistance;
typedef struct _virCapsHostSecModel virCapsHostSecModel;
typedef struct _virCapsHostSecModelLabel virCapsHostSecModelLabel;

8
src/libxl/libxl_capabilities.c
View File

@ -249,7 +249,7 @@ libxlCapsInitNuma(libxl_ctx *ctx, virCaps *caps)
libxl_cputopology *cpu_topo = NULL;
int nr_nodes = 0, nr_cpus = 0, nr_distances = 0;
virCapsHostNUMACellCPU **cpus = NULL;
virCapsHostNUMACellDistance *distances = NULL;
virNumaDistance *distances = NULL;
int *nr_cpus_node = NULL;
size_t i;
int ret = -1;
@ -320,11 +320,11 @@ libxlCapsInitNuma(libxl_ctx *ctx, virCaps *caps)
if (nr_distances) {
size_t j;
distances = g_new0(virCapsHostNUMACellDistance, nr_distances);
distances = g_new0(virNumaDistance, nr_distances);
for (j = 0; j < nr_distances; j++) {
distances[j].node = j;
distances[j].distance = numa_info[i].dists[j];
distances[j].cellid = j;
distances[j].value = numa_info[i].dists[j];
}
}