[libvirt] [PATCH 06/10] conf: Add support for cputune/cachetune
Pavel Hrdina
phrdina at redhat.com
Wed Jan 24 14:04:37 UTC 2018
On Tue, Jan 23, 2018 at 07:05:15PM +0100, Martin Kletzander wrote:
> More info in the documentation, this is basically the XML parsing/formatting
> support, schemas, tests and documentation for the new cputune/cachetune element
> that will get used by following patches.
>
> Signed-off-by: Martin Kletzander <mkletzan at redhat.com>
> ---
> docs/formatdomain.html.in | 54 ++++
> docs/schemas/domaincommon.rng | 32 +++
> src/conf/domain_conf.c | 295 ++++++++++++++++++++-
> src/conf/domain_conf.h | 13 +
> tests/genericxml2xmlindata/cachetune-cdp.xml | 36 +++
> .../cachetune-colliding-allocs.xml | 30 +++
> .../cachetune-colliding-tunes.xml | 32 +++
> .../cachetune-colliding-types.xml | 30 +++
> tests/genericxml2xmlindata/cachetune-small.xml | 29 ++
> tests/genericxml2xmlindata/cachetune.xml | 33 +++
> tests/genericxml2xmltest.c | 10 +
> 11 files changed, 592 insertions(+), 2 deletions(-)
> create mode 100644 tests/genericxml2xmlindata/cachetune-cdp.xml
> create mode 100644 tests/genericxml2xmlindata/cachetune-colliding-allocs.xml
> create mode 100644 tests/genericxml2xmlindata/cachetune-colliding-tunes.xml
> create mode 100644 tests/genericxml2xmlindata/cachetune-colliding-types.xml
> create mode 100644 tests/genericxml2xmlindata/cachetune-small.xml
> create mode 100644 tests/genericxml2xmlindata/cachetune.xml
>
> diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
> index d272cc1ba698..7b4d9051a551 100644
> --- a/docs/formatdomain.html.in
> +++ b/docs/formatdomain.html.in
> @@ -689,6 +689,10 @@
> <iothread_quota>-1</iothread_quota>
> <vcpusched vcpus='0-4,^3' scheduler='fifo' priority='1'/>
> <iothreadsched iothreads='2' scheduler='batch'/>
> + <cachetune vcpus='0-3'>
> + <cache id='0' level='3' type='both' size='3' unit='MiB'/>
> + <cache id='1' level='3' type='both' size='3' unit='MiB'/>
> + </cachetune>
> </cputune>
> ...
> </domain>
> @@ -834,6 +838,56 @@
> <span class="since">Since 1.2.13</span>
> </dd>
>
> + <dt><code>cachetune</code><span class="since">Since 4.1.0</span></dt>
> + <dd>
> + Optional <code>cachetune</code> element can control allocations for CPU
> + caches using the resctrl on the host. Whether or not is this supported
> + can be gathered from capabilities where some limitations like minimum
> + size and required granularity are reported as well. The required
s/ / /
> + attribute <code>vcpus</code> specifies to which vCPUs this allocation
> + applies. A vCPU can only be member of one <code>cachetune</code> element
> + allocations. Supported subelements are:
> + <dl>
> + <dt><code>cache</code></dt>
> + <dd>
> + This element controls the allocation of CPU cache and has the
> + following attributes:
> + <dl>
> + <dt><code>level</code></dt>
> + <dd>
> + Host cache level from which to allocate.
> + </dd>
> + <dt><code>id</code></dt>
> + <dd>
> + Host cache id from which to allocate.
> + </dd>
> + <dt><code>type</code></dt>
> + <dd>
> + Type of allocation. Can be <code>code</code> for code
s/ / /
> + (instructions), <code>data</code> for data or <code>both</code>
> + for both code and data (unified). Currently the allocation can
s/ / /
> + be done only with the same type as the host supports, meaning
> + you cannot request <code>both</code> for host with CDP
> + (code/data prioritization) enabled.
> + </dd>
> + <dt><code>size</code></dt>
> + <dd>
> + The size of the region to allocate. The value by default is in
> + bytes, but the <code>unit</code> attribute can be used to scale
> + the value.
> + </dd>
> + <dt><code>unit</code> (optional)</dt>
> + <dd>
> + If specified it is the unit such as KiB, MiB, GiB, or TiB
> + (described in the <code>memory</code> element
> + for <a href="#elementsMemoryAllocation">Memory Allocation</a>)
> + in which <code>size</code> is specified, defaults to bytes.
> + </dd>
> + </dl>
> + </dd>
> + </dl>
> +
> + </dd>
> </dl>
>
>
> diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
> index f22c932f6c09..252f58f4379c 100644
> --- a/docs/schemas/domaincommon.rng
> +++ b/docs/schemas/domaincommon.rng
> @@ -900,6 +900,38 @@
> <ref name="schedparam"/>
> </element>
> </zeroOrMore>
> + <zeroOrMore>
> + <element name="cachetune">
> + <attribute name="vcpus">
> + <ref name='cpuset'/>
> + </attribute>
> + <oneOrMore>
> + <element name="cache">
> + <attribute name="id">
> + <ref name='unsignedInt'/>
> + </attribute>
> + <attribute name="level">
> + <ref name='unsignedInt'/>
> + </attribute>
> + <attribute name="type">
> + <choice>
> + <value>both</value>
> + <value>code</value>
> + <value>data</value>
> + </choice>
> + </attribute>
> + <attribute name="size">
> + <ref name='unsignedLong'/>
> + </attribute>
> + <optional>
> + <attribute name='unit'>
> + <ref name='unit'/>
> + </attribute>
> + </optional>
> + </element>
> + </oneOrMore>
> + </element>
> + </zeroOrMore>
> </interleave>
> </element>
> </define>
> diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
> index a1c25060f9e9..27665d0372a7 100644
> --- a/src/conf/domain_conf.c
> +++ b/src/conf/domain_conf.c
> @@ -2883,6 +2883,19 @@ virDomainLoaderDefFree(virDomainLoaderDefPtr loader)
> VIR_FREE(loader);
> }
>
> +
> +static void
> +virDomainCachetuneDefFree(virDomainCachetuneDefPtr cachetune)
> +{
> + if (!cachetune)
> + return;
> +
> + virObjectUnref(cachetune->alloc);
> + virBitmapFree(cachetune->vcpus);
> + VIR_FREE(cachetune);
> +}
> +
> +
> void virDomainDefFree(virDomainDefPtr def)
> {
> size_t i;
> @@ -3055,6 +3068,10 @@ void virDomainDefFree(virDomainDefPtr def)
> virDomainShmemDefFree(def->shmems[i]);
> VIR_FREE(def->shmems);
>
> + for (i = 0; i < def->ncachetunes; i++)
> + virDomainCachetuneDefFree(def->cachetunes[i]);
> + VIR_FREE(def->cachetunes);
> +
> VIR_FREE(def->keywrap);
>
> if (def->namespaceData && def->ns.free)
> @@ -18247,6 +18264,194 @@ virDomainDefParseBootOptions(virDomainDefPtr def,
> }
>
>
> +static int
> +virDomainCachetuneDefParseCache(xmlXPathContextPtr ctxt,
> + xmlNodePtr node,
> + virResctrlAllocPtr alloc)
> +{
> + xmlNodePtr oldnode = ctxt->node;
> + unsigned int level;
> + unsigned int cache;
> + int type;
> + unsigned long long size;
> + char *tmp = NULL;
> + int ret = -1;
> +
> + ctxt->node = node;
> +
> + tmp = virXMLPropString(node, "id");
> + if (!tmp) {
> + virReportError(VIR_ERR_XML_ERROR, "%s",
> + _("Missing cachetune attribute 'id'"));
> + goto cleanup;
> + }
> + if (virStrToLong_uip(tmp, NULL, 10, &cache) < 0) {
> + virReportError(VIR_ERR_XML_ERROR,
> + _("Invalid cachetune attribute 'id' value '%s'"),
> + tmp);
> + goto cleanup;
> + }
> + VIR_FREE(tmp);
> +
> + tmp = virXMLPropString(node, "level");
> + if (!tmp) {
> + virReportError(VIR_ERR_XML_ERROR, "%s",
> + _("Missing cachetune attribute 'level'"));
> + goto cleanup;
> + }
> + if (virStrToLong_uip(tmp, NULL, 10, &level) < 0) {
> + virReportError(VIR_ERR_XML_ERROR,
> + _("Invalid cachetune attribute 'level' value '%s'"),
> + tmp);
> + goto cleanup;
> + }
> + VIR_FREE(tmp);
> +
> + tmp = virXMLPropString(node, "type");
> + if (!tmp) {
> + virReportError(VIR_ERR_XML_ERROR, "%s",
> + _("Missing cachetune attribute 'type'"));
> + goto cleanup;
> + }
> + type = virCacheTypeFromString(tmp);
> + if (type < 0) {
> + virReportError(VIR_ERR_XML_ERROR,
> + _("Invalid cachetune attribute 'type' value '%s'"),
> + tmp);
> + goto cleanup;
> + }
> + VIR_FREE(tmp);
> +
> + if (virDomainParseScaledValue("./@size", "./@unit",
> + ctxt, &size, 1024,
> + ULLONG_MAX, true) < 0)
> + goto cleanup;
> +
> + if (virResctrlAllocSetSize(alloc, level, type, cache, size) < 0)
> + goto cleanup;
> +
> + ret = 0;
> + cleanup:
> + ctxt->node = oldnode;
> + VIR_FREE(tmp);
> + return ret;
> +}
> +
> +
> +static int
> +virDomainCachetuneDefParse(virDomainDefPtr def,
> + xmlXPathContextPtr ctxt,
> + xmlNodePtr node,
> + unsigned int flags)
> +{
> + xmlNodePtr oldnode = ctxt->node;
> + xmlNodePtr *nodes = NULL;
> + virBitmapPtr vcpus = NULL;
> + virResctrlAllocPtr alloc = virResctrlAllocNew();
> + virDomainCachetuneDefPtr tmp_cachetune = NULL;
> + char *tmp = NULL;
> + char *vcpus_str = NULL;
> + char *alloc_id = NULL;
> + ssize_t i = 0;
> + int n;
> + int ret = -1;
> +
> + ctxt->node = node;
> +
> + if (!alloc)
> + goto cleanup;
> +
> + if (VIR_ALLOC(tmp_cachetune) < 0)
> + goto cleanup;
> +
> + vcpus_str = virXMLPropString(node, "vcpus");
> + if (!vcpus_str) {
> + virReportError(VIR_ERR_XML_ERROR, "%s",
> + _("Missing cachetune attribute 'vcpus'"));
> + goto cleanup;
> + }
> + if (virBitmapParse(vcpus_str, &vcpus, VIR_DOMAIN_CPUMASK_LEN) < 0) {
> + virReportError(VIR_ERR_XML_ERROR,
> + _("Invalid cachetune attribute 'vcpus' value '%s'"),
> + vcpus_str);
> + goto cleanup;
> + }
> +
> + /* We need to limit the bitmap to number of vCPUs. If there's nothing left,
> + * then we can just clean up and return 0 immediately */
> + virBitmapShrink(vcpus, def->maxvcpus);
> + if (virBitmapIsAllClear(vcpus)) {
> + ret = 0;
> + goto cleanup;
> + }
> +
> + if ((n = virXPathNodeSet("./cache", ctxt, &nodes)) < 0) {
> + virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> + _("Cannot extract cache nodes under cachetune"));
> + goto cleanup;
> + }
> +
> + for (i = 0; i < n; i++) {
> + if (virDomainCachetuneDefParseCache(ctxt, nodes[i], alloc) < 0)
> + goto cleanup;
> + }
> +
> + if (virResctrlAllocIsEmpty(alloc)) {
> + ret = 0;
> + goto cleanup;
> + }
Can this ever happen? The
> +
> + for (i = 0; i < def->ncachetunes; i++) {
> + if (virBitmapOverlaps(def->cachetunes[i]->vcpus, vcpus)) {
> + virReportError(VIR_ERR_XML_ERROR, "%s",
> + _("Overlapping vcpus in cachetunes"));
> + goto cleanup;
> + }
> + }
> +
> + /* We need to format it back because we need to be consistent in the naming
> + * even when users specify some "sub-optimal" string there. */
> + VIR_FREE(vcpus_str);
> + vcpus_str = virBitmapFormat(vcpus);
> + if (!vcpus_str)
> + goto cleanup;
> +
> + if (!(flags & VIR_DOMAIN_DEF_PARSE_INACTIVE))
> + alloc_id = virXMLPropString(node, "id");
> +
> + if (!alloc_id) {
> + /* The number of allocatios is limited and the directory structure is flat,
s/allocatios/allocations/
Reviewed-by: Pavel Hrdina <phrdina at redhat.com>
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