[libvirt] [PATCH v2 17/17] conf: Add memory bandwidth allocation capability of host
bing.niu at intel.com
bing.niu at intel.com
Sat Jul 28 05:48:41 UTC 2018
From: Bing Niu <bing.niu at intel.com>
Add new XML section to report host's memory bandwidth allocation
capability. The format as below example:
<host>
.....
<memory_bandwidth>
<node id='0' cpus='0-19'>
<control granularity='10' min ='10' maxAllocs='8'/>
</node>
</memory_bandwidth>
</host>
granularity ---- granularity of memory bandwidth, unit percentage.
min ---- minimum memory bandwidth allowed, unit percentage.
maxAllocs ---- maximum memory bandwidth allocation group supported.
Signed-off-by: Bing Niu <bing.niu at intel.com>
---
docs/schemas/capability.rng | 33 +++++++
src/conf/capabilities.c | 107 +++++++++++++++++++++
src/conf/capabilities.h | 11 +++
src/util/virresctrl.c | 20 ++++
src/util/virresctrl.h | 15 +++
.../linux-resctrl/resctrl/info/MB/bandwidth_gran | 1 +
.../linux-resctrl/resctrl/info/MB/min_bandwidth | 1 +
.../linux-resctrl/resctrl/info/MB/num_closids | 1 +
tests/vircaps2xmldata/vircaps-x86_64-resctrl.xml | 8 ++
tests/virresctrldata/resctrl.schemata | 1 +
10 files changed, 198 insertions(+)
create mode 100644 tests/vircaps2xmldata/linux-resctrl/resctrl/info/MB/bandwidth_gran
create mode 100644 tests/vircaps2xmldata/linux-resctrl/resctrl/info/MB/min_bandwidth
create mode 100644 tests/vircaps2xmldata/linux-resctrl/resctrl/info/MB/num_closids
diff --git a/docs/schemas/capability.rng b/docs/schemas/capability.rng
index 52164d5..d61515c 100644
--- a/docs/schemas/capability.rng
+++ b/docs/schemas/capability.rng
@@ -51,6 +51,9 @@
<optional>
<ref name='cache'/>
</optional>
+ <optional>
+ <ref name='memory_bandwidth'/>
+ </optional>
<zeroOrMore>
<ref name='secmodel'/>
</zeroOrMore>
@@ -326,6 +329,36 @@
</attribute>
</define>
+ <define name='memory_bandwidth'>
+ <element name='memory_bandwidth'>
+ <oneOrMore>
+ <element name='node'>
+ <attribute name='id'>
+ <ref name='unsignedInt'/>
+ </attribute>
+ <attribute name='cpus'>
+ <ref name='cpuset'/>
+ </attribute>
+ <zeroOrMore>
+ <element name='control'>
+ <attribute name='granularity'>
+ <ref name='unsignedInt'/>
+ </attribute>
+ <optional>
+ <attribute name='min'>
+ <ref name='unsignedInt'/>
+ </attribute>
+ </optional>
+ <attribute name='maxAllocs'>
+ <ref name='unsignedInt'/>
+ </attribute>
+ </element>
+ </zeroOrMore>
+ </element>
+ </oneOrMore>
+ </element>
+ </define>
+
<define name='guestcaps'>
<element name='guest'>
<ref name='ostype'/>
diff --git a/src/conf/capabilities.c b/src/conf/capabilities.c
index 0f96500..ef2ca81 100644
--- a/src/conf/capabilities.c
+++ b/src/conf/capabilities.c
@@ -198,6 +198,16 @@ virCapabilitiesFreeNUMAInfo(virCapsPtr caps)
}
static void
+virCapsHostMemBWNodeFree(virCapsHostMemBWNodePtr ptr)
+{
+ if (!ptr)
+ return;
+
+ virBitmapFree(ptr->cpus);
+ VIR_FREE(ptr);
+}
+
+static void
virCapabilitiesClearSecModel(virCapsHostSecModelPtr secmodel)
{
size_t i;
@@ -239,6 +249,10 @@ virCapsDispose(void *object)
virCapsHostCacheBankFree(caps->host.caches[i]);
VIR_FREE(caps->host.caches);
+ for (i = 0; i < caps->host.nnodes; i++)
+ virCapsHostMemBWNodeFree(caps->host.nodes[i]);
+ VIR_FREE(caps->host.nodes);
+
VIR_FREE(caps->host.netprefix);
VIR_FREE(caps->host.pagesSize);
virCPUDefFree(caps->host.cpu);
@@ -957,6 +971,58 @@ virCapabilitiesFormatCaches(virBufferPtr buf,
return 0;
}
+static int
+virCapabilitiesFormatMemoryBandwidth(virBufferPtr buf,
+ size_t nnodes,
+ virCapsHostMemBWNodePtr *nodes)
+{
+ size_t i = 0;
+ virBuffer controlBuf = VIR_BUFFER_INITIALIZER;
+
+ if (!nnodes)
+ return 0;
+
+ virBufferAddLit(buf, "<memory_bandwidth>\n");
+ virBufferAdjustIndent(buf, 2);
+
+ for (i = 0; i < nnodes; i++) {
+ virCapsHostMemBWNodePtr node = nodes[i];
+ virResctrlInfoMemBWPerNodePtr control = &node->control;
+ char *cpus_str = virBitmapFormat(node->cpus);
+
+ if (!cpus_str)
+ return -1;
+
+ virBufferAsprintf(buf,
+ "<node id='%u' cpus='%s'",
+ node->id, cpus_str);
+ VIR_FREE(cpus_str);
+
+ virBufferSetChildIndent(&controlBuf, buf);
+ virBufferAsprintf(&controlBuf,
+ "<control granularity='%u' min ='%u' "
+ "maxAllocs='%u'/>\n",
+ control->granularity, control->min,
+ control->max_allocation);
+
+ if (virBufferCheckError(&controlBuf) < 0)
+ return -1;
+
+ if (virBufferUse(&controlBuf)) {
+ virBufferAddLit(buf, ">\n");
+ virBufferAddBuffer(buf, &controlBuf);
+ virBufferAddLit(buf, "</node>\n");
+ } else {
+ virBufferAddLit(buf, "/>\n");
+ }
+ }
+
+ virBufferAdjustIndent(buf, -2);
+ virBufferAddLit(buf, "</memory_bandwidth>\n");
+
+ return 0;
+}
+
/**
* virCapabilitiesFormatXML:
* @caps: capabilities to format
@@ -1060,6 +1126,10 @@ virCapabilitiesFormatXML(virCapsPtr caps)
caps->host.caches) < 0)
goto error;
+ if (virCapabilitiesFormatMemoryBandwidth(&buf, caps->host.nnodes,
+ caps->host.nodes) < 0)
+ goto error;
+
for (i = 0; i < caps->host.nsecModels; i++) {
virBufferAddLit(&buf, "<secmodel>\n");
virBufferAdjustIndent(&buf, 2);
@@ -1602,6 +1672,40 @@ virCapabilitiesInitResctrl(virCapsPtr caps)
}
+static int
+virCapabilitiesInitResctrlMemory(virCapsPtr caps)
+{
+ virCapsHostMemBWNodePtr node = NULL;
+ size_t i = 0;
+ int ret = -1;
+
+ for (i = 0; i < caps->host.ncaches; i++) {
+ virCapsHostCacheBankPtr bank = caps->host.caches[i];
+ if (VIR_ALLOC(node) < 0)
+ goto cleanup;
+
+ if (virResctrlInfoGetMemoryBandwidth(caps->host.resctrl,
+ bank->level, &node->control) > 0) {
+ node->id = bank->id;
+ if (!(node->cpus = virBitmapNewCopy(bank->cpus)))
+ goto cleanup;
+
+ if (VIR_APPEND_ELEMENT(caps->host.nodes,
+ caps->host.nnodes, node) < 0) {
+ goto cleanup;
+ }
+ }
+ virCapsHostMemBWNodeFree(node);
+ node = NULL;
+ }
+
+ ret = 0;
+ cleanup:
+ virCapsHostMemBWNodeFree(node);
+ return ret;
+}
+
+
int
virCapabilitiesInitCaches(virCapsPtr caps)
{
@@ -1731,6 +1835,9 @@ virCapabilitiesInitCaches(virCapsPtr caps)
qsort(caps->host.caches, caps->host.ncaches,
sizeof(*caps->host.caches), virCapsHostCacheBankSorter);
+ if (virCapabilitiesInitResctrlMemory(caps) < 0)
+ goto cleanup;
+
ret = 0;
cleanup:
VIR_FREE(type);
diff --git a/src/conf/capabilities.h b/src/conf/capabilities.h
index fe1b9ea..046e275 100644
--- a/src/conf/capabilities.h
+++ b/src/conf/capabilities.h
@@ -151,6 +151,14 @@ struct _virCapsHostCacheBank {
virResctrlInfoPerCachePtr *controls;
};
+typedef struct _virCapsHostMemBWNode virCapsHostMemBWNode;
+typedef virCapsHostMemBWNode *virCapsHostMemBWNodePtr;
+struct _virCapsHostMemBWNode {
+ unsigned int id;
+ virBitmapPtr cpus; /* All CPUs that belong to this node*/
+ virResctrlInfoMemBWPerNode control;
+};
+
typedef struct _virCapsHost virCapsHost;
typedef virCapsHost *virCapsHostPtr;
struct _virCapsHost {
@@ -175,6 +183,9 @@ struct _virCapsHost {
size_t ncaches;
virCapsHostCacheBankPtr *caches;
+ size_t nnodes;
+ virCapsHostMemBWNodePtr *nodes;
+
size_t nsecModels;
virCapsHostSecModelPtr secModels;
diff --git a/src/util/virresctrl.c b/src/util/virresctrl.c
index b821aac..6a55b41 100644
--- a/src/util/virresctrl.c
+++ b/src/util/virresctrl.c
@@ -630,6 +630,26 @@ virResctrlInfoIsEmpty(virResctrlInfoPtr resctrl)
int
+virResctrlInfoGetMemoryBandwidth(virResctrlInfoPtr resctrl,
+ unsigned int level,
+ virResctrlInfoMemBWPerNodePtr control)
+{
+ virResctrlInfoMemBWPtr membw_info = resctrl->membw_info;
+
+ if (!membw_info)
+ return 0;
+
+ if (membw_info->last_level_cache != level)
+ return 0;
+
+ control->granularity = membw_info->bandwidth_granularity;
+ control->min = membw_info->min_bandwidth;
+ control->max_allocation = membw_info->max_allocation;
+ return 1;
+}
+
+
+int
virResctrlInfoGetCache(virResctrlInfoPtr resctrl,
unsigned int level,
unsigned long long size,
diff --git a/src/util/virresctrl.h b/src/util/virresctrl.h
index 8d62517..cfd56dd 100644
--- a/src/util/virresctrl.h
+++ b/src/util/virresctrl.h
@@ -50,6 +50,17 @@ struct _virResctrlInfoPerCache {
unsigned int max_allocation;
};
+typedef struct _virResctrlInfoMemBWPerNode virResctrlInfoMemBWPerNode;
+typedef virResctrlInfoMemBWPerNode *virResctrlInfoMemBWPerNodePtr;
+struct _virResctrlInfoMemBWPerNode {
+ /* Smallest possible increase of the allocation bandwidth in percentage */
+ unsigned int granularity;
+ /* Minimal allocatable bandwidth in percentage */
+ unsigned int min;
+ /* Maximum number of simultaneous allocations */
+ unsigned int max_allocation;
+};
+
typedef struct _virResctrlInfo virResctrlInfo;
typedef virResctrlInfo *virResctrlInfoPtr;
@@ -63,6 +74,10 @@ virResctrlInfoGetCache(virResctrlInfoPtr resctrl,
size_t *ncontrols,
virResctrlInfoPerCachePtr **controls);
+int
+virResctrlInfoGetMemoryBandwidth(virResctrlInfoPtr resctrl,
+ unsigned int level,
+ virResctrlInfoMemBWPerNodePtr control);
/* Alloc-related things */
typedef struct _virResctrlAlloc virResctrlAlloc;
typedef virResctrlAlloc *virResctrlAllocPtr;
diff --git a/tests/vircaps2xmldata/linux-resctrl/resctrl/info/MB/bandwidth_gran b/tests/vircaps2xmldata/linux-resctrl/resctrl/info/MB/bandwidth_gran
new file mode 100644
index 0000000..f599e28
--- /dev/null
+++ b/tests/vircaps2xmldata/linux-resctrl/resctrl/info/MB/bandwidth_gran
@@ -0,0 +1 @@
+10
diff --git a/tests/vircaps2xmldata/linux-resctrl/resctrl/info/MB/min_bandwidth b/tests/vircaps2xmldata/linux-resctrl/resctrl/info/MB/min_bandwidth
new file mode 100644
index 0000000..f599e28
--- /dev/null
+++ b/tests/vircaps2xmldata/linux-resctrl/resctrl/info/MB/min_bandwidth
@@ -0,0 +1 @@
+10
diff --git a/tests/vircaps2xmldata/linux-resctrl/resctrl/info/MB/num_closids b/tests/vircaps2xmldata/linux-resctrl/resctrl/info/MB/num_closids
new file mode 100644
index 0000000..b8626c4
--- /dev/null
+++ b/tests/vircaps2xmldata/linux-resctrl/resctrl/info/MB/num_closids
@@ -0,0 +1 @@
+4
diff --git a/tests/vircaps2xmldata/vircaps-x86_64-resctrl.xml b/tests/vircaps2xmldata/vircaps-x86_64-resctrl.xml
index 4840614..9b00cf0 100644
--- a/tests/vircaps2xmldata/vircaps-x86_64-resctrl.xml
+++ b/tests/vircaps2xmldata/vircaps-x86_64-resctrl.xml
@@ -49,6 +49,14 @@
<control granularity='768' min='1536' unit='KiB' type='both' maxAllocs='4'/>
</bank>
</cache>
+ <memory_bandwidth>
+ <node id='0' cpus='0-5'>
+ <control granularity='10' min ='10' maxAllocs='4'/>
+ </node>
+ <node id='1' cpus='6-11'>
+ <control granularity='10' min ='10' maxAllocs='4'/>
+ </node>
+ </memory_bandwidth>
</host>
</capabilities>
diff --git a/tests/virresctrldata/resctrl.schemata b/tests/virresctrldata/resctrl.schemata
index fa980e5..2578822 100644
--- a/tests/virresctrldata/resctrl.schemata
+++ b/tests/virresctrldata/resctrl.schemata
@@ -1 +1,2 @@
L3:0=000ff;1=000f0
+MB:0=100;1=100
--
2.7.4
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