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XML definitions for guest NUMA and parsing routines

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This patch adds XML definitions for guest NUMA specification and contains
routines to parse the same. The guest NUMA specification looks like this:

<cpu>
        ...
        <topology sockets='2' cores='4' threads='2'/>
        <numa>
                <cell cpus='0-7' memory='512000'/>
                <cell cpus='8-15' memory='512000'/>
        </numa>
        ...
</cpu>

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
This commit is contained in:
Bharata B Rao 2011-11-11 18:21:45 +05:30 committed by Eric Blake
parent c74b97156f
commit 5f7b71b413
6 changed files with 166 additions and 3 deletions
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1
AUTHORS
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@ -205,6 +205,7 @@ Patches have also been contributed by:
Patrice LACHANCE <patlachance@gmail.com>
Eli Qiao <taget@linux.vnet.ibm.com>
Michael Wood <esiotrot@gmail.com>
Bharata B Rao <bharata@linux.vnet.ibm.com>
[....send patches to get your name here....]

29
docs/formatdomain.html.in
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@ -628,6 +628,35 @@
</dd>
</dl>
<p>
Guest NUMA topology can be specifed using the <code>numa</code> element.
<span class="since">Since 0.9.8</span>
</p>
<pre>
...
&lt;cpu&gt;
...
&lt;numa&gt;
&lt;cell cpus='0-3' memory='512000'/&gt;
&lt;cell cpus='4-7' memory='512000'/&gt;
&lt;/numa&gt;
...
&lt;/cpu&gt;
...</pre>
<p>
Each <code>cell</code> element specifies a NUMA cell or a NUMA node.
<code>cpus</code> specifies the CPU or range of CPUs that are part of
the node. <code>memory</code> specifies the node memory in kilobytes
(i.e. blocks of 1024 bytes). Each cell or node is assigned cellid
or nodeid in the increasing order starting from 0.
</p>
<p>
This guest NUMA specification is currently available only for QEMU/KVM.
</p>
<h3><a name="elementsLifecycle">Lifecycle control</a></h3>
<p>

33
docs/schemas/domaincommon.rng
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@ -2297,7 +2297,16 @@
<define name="cpu">
<element name="cpu">
<choice>
<ref name="cpuTopology"/>
<group>
<interleave>
<optional>
<ref name="cpuTopology"/>
</optional>
<optional>
<ref name="cpuNuma"/>
</optional>
</interleave>
</group>
<group>
<ref name="cpuMatch"/>
<interleave>
@ -2311,6 +2320,9 @@
<zeroOrMore>
<ref name="cpuFeature"/>
</zeroOrMore>
<optional>
<ref name="cpuNuma"/>
</optional>
</interleave>
</group>
</choice>
@ -2371,6 +2383,25 @@
</element>
</define>
<define name="cpuNuma">
<element name="numa">
<oneOrMore>
<ref name="numaCell"/>
</oneOrMore>
</element>
</define>
<define name="numaCell">
<element name="cell">
<attribute name="cpus">
<ref name="cpuset"/>
</attribute>
<attribute name="memory">
<ref name="memoryKB"/>
</attribute>
</element>
</define>
<!--
System information specification:
Placeholder for system specific informations likes the ones

86
src/conf/cpu_conf.c
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@ -28,6 +28,7 @@
#include "util.h"
#include "buf.h"
#include "cpu_conf.h"
#include "domain_conf.h"
#define VIR_FROM_THIS VIR_FROM_CPU
@ -67,6 +68,12 @@ virCPUDefFree(virCPUDefPtr def)
VIR_FREE(def->features[i].name);
VIR_FREE(def->features);
for (i = 0 ; i < def->ncells ; i++) {
VIR_FREE(def->cells[i].cpumask);
VIR_FREE(def->cells[i].cpustr);
}
VIR_FREE(def->cells);
VIR_FREE(def);
}
@ -109,7 +116,6 @@ no_memory:
return NULL;
}
virCPUDefPtr
virCPUDefParseXML(const xmlNodePtr node,
xmlXPathContextPtr ctxt,
@ -289,9 +295,75 @@ virCPUDefParseXML(const xmlNodePtr node,
def->features[i].policy = policy;
}
if (virXPathNode("./numa[1]", ctxt)) {
VIR_FREE(nodes);
n = virXPathNodeSet("./numa[1]/cell", ctxt, &nodes);
if (n <= 0) {
virCPUReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("NUMA topology defined without NUMA cells"));
goto error;
}
if (VIR_RESIZE_N(def->cells, def->ncells_max,
def->ncells, n) < 0)
goto no_memory;
def->ncells = n;
for (i = 0 ; i < n ; i++) {
char *cpus, *cpus_parse, *memory;
int cpumasklen = VIR_DOMAIN_CPUMASK_LEN;
int ret, ncpus = 0;
def->cells[i].cellid = i;
cpus = cpus_parse = virXMLPropString(nodes[i], "cpus");
if (!cpus) {
virCPUReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("Missing 'cpus' attribute in NUMA cell"));
goto error;
}
def->cells[i].cpustr = strdup(cpus);
if (!def->cells[i].cpustr) {
VIR_FREE(cpus);
goto no_memory;
}
if (VIR_ALLOC_N(def->cells[i].cpumask, cpumasklen) < 0) {
VIR_FREE(cpus);
goto no_memory;
}
ncpus = virDomainCpuSetParse((const char **)&cpus_parse,
0, def->cells[i].cpumask, cpumasklen);
if (ncpus <= 0) {
VIR_FREE(cpus);
goto error;
}
def->cells_cpus += ncpus;
memory = virXMLPropString(nodes[i], "memory");
if (!memory) {
virCPUReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("Missing 'memory' attribute in NUMA cell"));
VIR_FREE(cpus);
goto error;
}
ret = virStrToLong_ui(memory, NULL, 10, &def->cells[i].mem);
if (ret == -1) {
VIR_FREE(cpus);
VIR_FREE(memory);
goto error;
}
VIR_FREE(cpus);
VIR_FREE(memory);
}
}
cleanup:
VIR_FREE(nodes);
return def;
no_memory:
@ -414,6 +486,16 @@ virCPUDefFormatBuf(virBufferPtr buf,
}
}
if (def->ncells) {
virBufferAddLit(buf, "<numa>\n");
for (i = 0; i < def->ncells; i++) {
virBufferAddLit(buf, " <cell");
virBufferAsprintf(buf, " cpus='%s'", def->cells[i].cpustr);
virBufferAsprintf(buf, " memory='%d'", def->cells[i].mem);
virBufferAddLit(buf, "/>\n");
}
virBufferAddLit(buf, "</numa>\n");
}
return 0;
}

13
src/conf/cpu_conf.h
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@ -67,6 +67,15 @@ struct _virCPUFeatureDef {
int policy; /* enum virCPUFeaturePolicy */
};
typedef struct _virCellDef virCellDef;
typedef virCellDef *virCellDefPtr;
struct _virCellDef {
int cellid;
char *cpumask; /* CPUs that are part of this node */
char *cpustr; /* CPUs stored in string form for dumpxml */
unsigned int mem; /* Node memory in kB */
};
typedef struct _virCPUDef virCPUDef;
typedef virCPUDef *virCPUDefPtr;
struct _virCPUDef {
@ -81,6 +90,10 @@ struct _virCPUDef {
size_t nfeatures;
size_t nfeatures_max;
virCPUFeatureDefPtr features;
size_t ncells;
size_t ncells_max;
virCellDefPtr cells;
unsigned int cells_cpus;
};

7
src/conf/domain_conf.c
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@ -7572,6 +7572,13 @@ static virDomainDefPtr virDomainDefParseXML(virCapsPtr caps,
if (def->cpu == NULL)
goto error;
if (def->cpu->cells_cpus > def->maxvcpus) {
virDomainReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Number of CPUs in <numa> exceeds the"
" <vcpu> count"));
goto error;
}
}
if ((node = virXPathNode("./sysinfo[1]", ctxt)) != NULL) {