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conf: Add memory bandwidth allocation capability of host

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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@intel.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
This commit is contained in:
Bing Niu 2018-07-30 11:12:41 +08:00 committed by John Ferlan
parent 8d6f508e64
commit 7995fecc25
10 changed files with 198 additions and 0 deletions
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33
docs/schemas/capability.rng
View File

@ -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'/>

107
src/conf/capabilities.c
View File

@ -197,6 +197,16 @@ virCapabilitiesFreeNUMAInfo(virCapsPtr caps)
caps->host.nnumaCell = 0;
}
static void
virCapsHostMemBWNodeFree(virCapsHostMemBWNodePtr ptr)
{
if (!ptr)
return;
virBitmapFree(ptr->cpus);
VIR_FREE(ptr);
}
static void
virCapabilitiesClearSecModel(virCapsHostSecModelPtr secmodel)
{
@ -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);
@ -946,6 +960,58 @@ 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
@ -1049,6 +1115,10 @@ 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);
@ -1591,6 +1661,40 @@ 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)
{
@ -1720,6 +1824,9 @@ 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);

11
src/conf/capabilities.h
View File

@ -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;

20
src/util/virresctrl.c
View File

@ -629,6 +629,26 @@ 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,

15
src/util/virresctrl.h
View File

@ -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;

1
tests/vircaps2xmldata/linux-resctrl/resctrl/info/MB/bandwidth_gran Normal file
View File

@ -0,0 +1 @@
10

1
tests/vircaps2xmldata/linux-resctrl/resctrl/info/MB/min_bandwidth Normal file
View File

@ -0,0 +1 @@
10

1
tests/vircaps2xmldata/linux-resctrl/resctrl/info/MB/num_closids Normal file
View File

@ -0,0 +1 @@
4

8
tests/vircaps2xmldata/vircaps-x86_64-resctrl.xml
View File

@ -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>

1
tests/virresctrldata/resctrl.schemata
View File

@ -1 +1,2 @@
L3:0=000ff;1=000f0
MB:0=100;1=100