8:18 p.m.
Adding a new XML element 'iothreadids' in order to allow defining
specific IOThread ID's rather than relying on the algorithm to assign
IOThread ID's starting at 1 and incrementing to iothreads count.
This will allow future patches to be able to add new IOThreads by
a specific iothread_id and of course delete any exisiting IOThread.
Each iothreadids element will have 'n' <iothread> children elements
which will have attribute "id". The "id" will allow for definition
of any "valid" (eg > 0) iothread_id value.
On input, if any <iothreadids> <iothread>'s are provided, they will
be marked so that we only print out what we read in.
On input, if no <iothreadids> are provided, the PostParse code will
self generate a list of ID's starting at 1 and going to the number
of iothreads defined for the domain (just like the current algorithm
numbering scheme). A future patch will rework the existing algorithm
to make use of the iothreadids list.
On output, only print out the <iothreadids> if they were read in.
Signed-off-by: John Ferlan <jferlan(a)redhat.com>
---
docs/formatdomain.html.in | 30 +++++++
docs/schemas/domaincommon.rng | 12 +++
src/conf/domain_conf.c | 190 +++++++++++++++++++++++++++++++++++++++++-
src/conf/domain_conf.h | 15 ++++
src/libvirt_private.syms | 3 +
5 files changed, 248 insertions(+), 2 deletions(-)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index e921749..518f7c5 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -521,6 +521,18 @@
...
</domain>
</pre>
+<pre>
+<domain>
+ ...
+ <iothreadids>
+ <iothread id="2"/>
+ <iothread id="4"/>
+ <iothread id="6"/>
+ <iothread id="8"/>
+ </iothreadids>
+ ...
+</domain>
+</pre>
<dl>
<dt><code>iothreads</code></dt>
@@ -530,7 +542,25 @@
virtio-blk-pci and virtio-blk-ccw target storage devices. There
should be only 1 or 2 IOThreads per host CPU. There may be more
than one supported device assigned to each IOThread.
+ <span class="since">Since 1.2.8</span>
</dd>
+ <dt><code>iothreadids</code></dt>
+ <dd>
+ The optional <code>iothreadids</code> element provides the
capability
+ to specifically define the IOThread ID's for the domain. By default,
+ IOThread ID's are sequentially numbered starting from 1 through the
+ number of <code>iothreads</code> defined for the domain. The
+ <code>id</code> attribute is used to define the IOThread ID. The
+ <code>id</code> attribute must be a positive integer greater than 0.
+ If there are less <code>iothreadids</code> defined than
+ <code>iothreads</code> defined for the domain, then libvirt will
+ sequentially fill <code>iothreadids</code> starting at 1 avoiding
+ any predefined <code>id</code>. If there are more
+ <code>iothreadids</code> defined than
<code>iothreads</code>
+ defined for the domain, then the <code>iothreads</code> value
+ will be adjusted accordingly.
+ <span class="since">Since 1.2.15</span>
+ </dd>
</dl>
<h3><a name="elementsCPUTuning">CPU
Tuning</a></h3>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 03fd541..4bd32bd 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -675,6 +675,18 @@
</optional>
<optional>
+ <element name="iothreadids">
+ <zeroOrMore>
+ <element name="iothread">
+ <attribute name="id">
+ <ref name="unsignedInt"/>
+ </attribute>
+ </element>
+ </zeroOrMore>
+ </element>
+ </optional>
+
+ <optional>
<ref name="blkiotune"/>
</optional>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 4d7e3c9..e86b7e2 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -2113,6 +2113,23 @@ virDomainPinDefCopy(virDomainPinDefPtr *src, int npin)
return NULL;
}
+
+static void
+virDomainIOThreadIDDefArrayFree(virDomainIOThreadIDDefPtr *def,
+ int nids)
+{
+ size_t i;
+
+ if (!def)
+ return;
+
+ for (i = 0; i < nids; i++)
+ VIR_FREE(def[i]);
+
+ VIR_FREE(def);
+}
+
+
void
virDomainPinDefFree(virDomainPinDefPtr def)
{
@@ -2310,6 +2327,8 @@ void virDomainDefFree(virDomainDefPtr def)
virCPUDefFree(def->cpu);
+ virDomainIOThreadIDDefArrayFree(def->iothreadids, def->niothreadids);
+
virDomainPinDefArrayFree(def->cputune.vcpupin, def->cputune.nvcpupin);
virDomainPinDefFree(def->cputune.emulatorpin);
@@ -3304,6 +3323,18 @@ virDomainDefPostParseInternal(virDomainDefPtr def,
return -1;
}
+ /* Fully populate the IOThread ID list */
+ if (def->iothreads && def->iothreads != def->niothreadids) {
+ unsigned int iothread_id = 1;
+ while (def->niothreadids != def->iothreads) {
+ if (!virDomainIOThreadIDFind(def, iothread_id)) {
+ if (virDomainIOThreadIDAdd(def, iothread_id) < 0)
+ return -1;
+ }
+ iothread_id++;
+ }
+ }
+
if (virDomainDefGetMemoryInitial(def) == 0) {
virReportError(VIR_ERR_XML_ERROR, "%s",
_("Memory size must be specified via <memory> or in the
"
@@ -13173,6 +13204,56 @@ virDomainIdmapDefParseXML(xmlXPathContextPtr ctxt,
return idmap;
}
+/* Parse the XML definition for an IOThread ID
+ *
+ * Format is :
+ *
+ * <iothreads>4</iothreads>
+ * <iothreadids>
+ * <iothread id='1'/>
+ * <iothread id='3'/>
+ * <iothread id='5'/>
+ * <iothread id='7'/>
+ * </iothreadids>
+ */
+static virDomainIOThreadIDDefPtr
+virDomainIOThreadIDDefParseXML(xmlNodePtr node,
+ xmlXPathContextPtr ctxt)
+{
+ virDomainIOThreadIDDefPtr iothrid;
+ xmlNodePtr oldnode = ctxt->node;
+ char *tmp = NULL;
+
+ if (VIR_ALLOC(iothrid) < 0)
+ return NULL;
+
+ ctxt->node = node;
+
+ if (!(tmp = virXPathString("string(./@id)", ctxt))) {
+ virReportError(VIR_ERR_XML_ERROR, "%s",
+ _("Missing 'id' attribute in <iothread>
element"));
+ goto error;
+ }
+ if (virStrToLong_uip(tmp, NULL, 10, &iothrid->iothread_id) < 0 ||
+ iothrid->iothread_id == 0) {
+ virReportError(VIR_ERR_XML_ERROR,
+ _("invalid iothread 'id' value '%s'"),
tmp);
+ goto error;
+ }
+
+ iothrid->defined = true;
+
+ cleanup:
+ VIR_FREE(tmp);
+ ctxt->node = oldnode;
+ return iothrid;
+
+ error:
+ VIR_FREE(iothrid);
+ goto cleanup;
+}
+
+
/* Parse the XML definition for a vcpupin
*
* vcpupin has the form of
@@ -13948,6 +14029,32 @@ virDomainDefParseXML(xmlDocPtr xml,
}
VIR_FREE(tmp);
+ /* Extract any iothread id's defined */
+ if ((n = virXPathNodeSet("./iothreadids/iothread", ctxt, &nodes)) <
0)
+ goto error;
+
+ if (n > def->iothreads)
+ def->iothreads = n;
+
+ if (n && VIR_ALLOC_N(def->iothreadids, MAX(n, def->iothreads)) < 0)
+ goto error;
+
+ for (i = 0; i < n; i++) {
+ virDomainIOThreadIDDefPtr iothrid = NULL;
+ if (!(iothrid = virDomainIOThreadIDDefParseXML(nodes[i], ctxt)))
+ goto error;
+
+ if (virDomainIOThreadIDFind(def, iothrid->iothread_id)) {
+ virReportError(VIR_ERR_XML_ERROR,
+ _("duplicate iothread id '%u' found"),
+ iothrid->iothread_id);
+ VIR_FREE(iothrid);
+ goto error;
+ }
+ def->iothreadids[def->niothreadids++] = iothrid;
+ }
+ VIR_FREE(nodes);
+
/* Extract cpu tunables. */
if ((n = virXPathULong("string(./cputune/shares[1])", ctxt,
&def->cputune.shares)) < -1) {
@@ -17324,6 +17431,66 @@ virDomainDefAddImplicitControllers(virDomainDefPtr def)
return 0;
}
+virDomainIOThreadIDDefPtr
+virDomainIOThreadIDFind(virDomainDefPtr def,
+ unsigned int iothread_id)
+{
+ size_t i;
+
+ if (!def->iothreadids || !def->niothreadids)
+ return NULL;
+
+ for (i = 0; i < def->niothreadids; i++) {
+ if (iothread_id == def->iothreadids[i]->iothread_id)
+ return def->iothreadids[i];
+ }
+
+ return NULL;
+}
+
+int
+virDomainIOThreadIDAdd(virDomainDefPtr def,
+ unsigned int iothread_id)
+{
+ virDomainIOThreadIDDefPtr iothrid = NULL;
+
+ if (virDomainIOThreadIDFind(def, iothread_id)) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("cannot duplicate iothread_id '%u' in
iothreadids"),
+ iothread_id);
+ return -1;
+ }
+
+ if (VIR_ALLOC(iothrid) < 0)
+ goto error;
+
+ iothrid->iothread_id = iothread_id;
+
+ if (VIR_APPEND_ELEMENT(def->iothreadids, def->niothreadids, iothrid) < 0)
+ goto error;
+
+ return 0;
+
+ error:
+ VIR_FREE(iothrid);
+ return -1;
+}
+
+void
+virDomainIOThreadIDDel(virDomainDefPtr def,
+ unsigned int iothread_id)
+{
+ int n;
+
+ for (n = 0; n < def->niothreadids; n++) {
+ if (def->iothreadids[n]->iothread_id == iothread_id) {
+ VIR_FREE(def->iothreadids[n]);
+ VIR_DELETE_ELEMENT(def->iothreadids, n, def->niothreadids);
+ return;
+ }
+ }
+}
+
/* Check if vcpupin with same id already exists. */
bool
virDomainPinIsDuplicate(virDomainPinDefPtr *def,
@@ -20666,8 +20833,27 @@ virDomainDefFormatInternal(virDomainDefPtr def,
virBufferAsprintf(buf, " current='%u'", def->vcpus);
virBufferAsprintf(buf, ">%u</vcpu>\n", def->maxvcpus);
- if (def->iothreads > 0)
- virBufferAsprintf(buf, "<iothreads>%u</iothreads>\n",
def->iothreads);
+ if (def->iothreads > 0) {
+ virBufferAsprintf(buf, "<iothreads>%u</iothreads>\n",
+ def->iothreads);
+ /* If we parsed the iothreadids, then write out those that we parsed */
+ for (i = 0; i < def->niothreadids; i++) {
+ if (def->iothreadids[i]->defined)
+ break;
+ }
+ if (i < def->niothreadids) {
+ virBufferAddLit(buf, "<iothreadids>\n");
+ virBufferAdjustIndent(buf, 2);
+ for (i = 0; i < def->niothreadids; i++) {
+ if (!def->iothreadids[i]->defined)
+ continue;
+ virBufferAsprintf(buf, "<iothread id='%u'/>\n",
+ def->iothreadids[i]->iothread_id);
+ }
+ virBufferAdjustIndent(buf, -2);
+ virBufferAddLit(buf, "</iothreadids>\n");
+ }
+ }
if (def->cputune.sharesSpecified ||
(def->cputune.nvcpupin && !virDomainIsAllVcpupinInherited(def)) ||
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index e6fa3c9..9e7bdf9 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -2041,6 +2041,14 @@ struct _virDomainHugePage {
unsigned long long size; /* hugepage size in KiB */
};
+typedef struct _virDomainIOThreadIDDef virDomainIOThreadIDDef;
+typedef virDomainIOThreadIDDef *virDomainIOThreadIDDefPtr;
+
+struct _virDomainIOThreadIDDef {
+ bool defined;
+ unsigned int iothread_id;
+};
+
typedef struct _virDomainCputune virDomainCputune;
typedef virDomainCputune *virDomainCputunePtr;
@@ -2132,6 +2140,8 @@ struct _virDomainDef {
virBitmapPtr cpumask;
unsigned int iothreads;
+ size_t niothreadids;
+ virDomainIOThreadIDDefPtr *iothreadids;
virDomainCputune cputune;
@@ -2590,6 +2600,11 @@ bool virDomainDefCheckABIStability(virDomainDefPtr src,
int virDomainDefAddImplicitControllers(virDomainDefPtr def);
+virDomainIOThreadIDDefPtr
+virDomainIOThreadIDFind(virDomainDefPtr def, unsigned int iothread_id);
+int virDomainIOThreadIDAdd(virDomainDefPtr def, unsigned int iothread_id);
+void virDomainIOThreadIDDel(virDomainDefPtr def, unsigned int iothread_id);
+
unsigned int virDomainDefFormatConvertXMLFlags(unsigned int flags);
char *virDomainDefFormat(virDomainDefPtr def,
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 7166283..12fd9e9 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -326,6 +326,9 @@ virDomainHubTypeToString;
virDomainHypervTypeFromString;
virDomainHypervTypeToString;
virDomainInputDefFree;
+virDomainIOThreadIDAdd;
+virDomainIOThreadIDDel;
+virDomainIOThreadIDFind;
virDomainLeaseDefFree;
virDomainLeaseIndex;
virDomainLeaseInsert;
--
2.1.0