[libvirt] [PATCH 06/10] conf: Add support for cputune/cachetune
Pavel Hrdina
phrdina at redhat.com
Thu Jan 25 09:14:17 UTC 2018
On Wed, Jan 24, 2018 at 10:32:07PM +0100, Martin Kletzander wrote:
> On Wed, Jan 24, 2018 at 03:04:37PM +0100, Pavel Hrdina wrote:
> > 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/ / /
> >
>
> Fixed all three.
>
> /me wonders why people still insist on this. Is someone editing these
> files with proportional font? Do we have any other output than
> HTML? I guess this will be yet another thing I have to get used to
> and surrender.
I personally don't care about the double space or single space, this
was just for consistency.
> > > + 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
> >
>
> Sure, for example:
>
> <cachetune/>
Right, I figure that out and I thought that I removed this comment.
> > > +
> > > + 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/
> >
>
> Fixed.
>
> > Reviewed-by: Pavel Hrdina <phrdina at redhat.com>
>
>
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