[libvirt] [RFC/PATCH v1] Adding entry for cpu tunable shares in xml

From: Nikunj A. Dadhania <nikunj(a)linux.vnet.ibm.com&gt; Make cpu share persistent and add support for parsing them. docs/formatdomain.html.in: Document cputune element src/conf/domain_conf.c,src/conf/domain_conf.h: Add cputune element parsing src/lxc/lxc_controller.c: Use the parsed cputune shares value src/qemu/qemu_cgroup.c: Use the parsed cputune shares value Signed-off-by: Nikunj A. Dadhania <nikunj(a)linux.vnet.ibm.com&gt; --- docs/formatdomain.html.in | 11 +++++++++++ src/conf/domain_conf.c | 14 ++++++++++++++ src/conf/domain_conf.h | 3 +++ src/lxc/lxc_controller.c | 10 ++++++++++ src/qemu/qemu_cgroup.c | 15 +++++++++++++++ 5 files changed, 53 insertions(+), 0 deletions(-) diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in index 55e2cbd..522dc06 100644 --- a/docs/formatdomain.html.in +++ b/docs/formatdomain.html.in @@ -280,6 +280,9 @@ &lt;swap_hard_limit&gt;2097152&lt;/swap_hard_limit&gt; &lt;min_guarantee&gt;65536&lt;/min_guarantee&gt; &lt;/memtune&gt; + &lt;cputune&gt; + &lt;shares&gt;1024&lt;/shares&gt; + &lt;/cputune&gt; &lt;vcpu cpuset="1-4,^3,6" current="1"&gt;2&lt;/vcpu&gt; ...</pre> @@ -317,6 +320,14 @@ <dd> The optional <code>min_guarantee</code> element is the guaranteed minimum memory allocation for the guest. The units for this value are kilobytes (i.e. blocks of 1024 bytes)</dd> + <dt><code>cputune</code></dt> + <dd> The optional <code>cputune</code> element provides details + regarding the cpu tuneable parameters for the domain. If this is + omitted, it defaults to the OS provided defaults.</dd> + <dt><code>shares</code></dt> + <dd> The optional <code>shares</code> element is the proportional + weighted share for the domain. If this is omitted, it defaults to the OS + provided defaults.</dd> <dt><code>vcpu</code></dt> <dd>The content of this element defines the maximum number of virtual CPUs allocated for the guest OS, which must be between 1 and diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index 645767e..63c8927 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -4904,6 +4904,11 @@ static virDomainDefPtr virDomainDefParseXML(virCapsPtr caps, &def->mem.swap_hard_limit) < 0) def->mem.swap_hard_limit = 0; + /* Extract cpu tunables */ + if (virXPathULong("string(./cputune/shares[1])", ctxt, + &def->cputune.shares) < 0) + def->cputune.shares = 0; + n = virXPathULong("string(./vcpu[1])", ctxt, &count); if (n == -2) { virDomainReportError(VIR_ERR_XML_ERROR, "%s", @@ -7313,6 +7318,15 @@ char *virDomainDefFormat(virDomainDefPtr def, def->mem.swap_hard_limit) virBufferVSprintf(&buf, " </memtune>\n"); + if (def->cputune.shares) + virBufferVSprintf(&buf, " <cputune>\n"); + if (def->cputune.shares) { + virBufferVSprintf(&buf, " <shares>%lu</shares>\n", + def->cputune.shares); + } + if (def->cputune.shares) + virBufferVSprintf(&buf, " </cputune>\n"); + if (def->mem.hugepage_backed) { virBufferAddLit(&buf, " <memoryBacking>\n"); virBufferAddLit(&buf, " <hugepages/>\n"); diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h index cf7bdc0..a2c83d3 100644 --- a/src/conf/domain_conf.h +++ b/src/conf/domain_conf.h @@ -981,6 +981,9 @@ struct _virDomainDef { unsigned short maxvcpus; int cpumasklen; char *cpumask; + struct { + unsigned long shares; /* proportional weight */ + } cputune; /* These 3 are based on virDomainLifeCycleAction enum flags */ int onReboot; diff --git a/src/lxc/lxc_controller.c b/src/lxc/lxc_controller.c index af0b70c..24edb49 100644 --- a/src/lxc/lxc_controller.c +++ b/src/lxc/lxc_controller.c @@ -144,6 +144,16 @@ static int lxcSetContainerResources(virDomainDefPtr def) } } + if(def->cputune.shares) { + rc = virCgroupSetCpuShares(cgroup, def->cputune.shares); + if (rc != 0) { + virReportSystemError(-rc, + _("Unable to set cpu shares for domain %s"), + def->name); + goto cleanup; + } + } + rc = virCgroupDenyAllDevices(cgroup); if (rc != 0) { virReportSystemError(-rc, diff --git a/src/qemu/qemu_cgroup.c b/src/qemu/qemu_cgroup.c index e5536c0..d4e73bd 100644 --- a/src/qemu/qemu_cgroup.c +++ b/src/qemu/qemu_cgroup.c @@ -304,6 +304,21 @@ int qemuSetupCgroup(struct qemud_driver *driver, vm->def->name); } + if ((rc = qemuCgroupControllerActive(driver, VIR_CGROUP_CONTROLLER_CPU))) { + if (vm->def->cputune.shares != 0) { + rc = virCgroupSetCpuShares(cgroup, vm->def->cputune.shares); + if (rc != 0) { + virReportSystemError(-rc, + _("Unable to set cpu shares for domain %s"), + vm->def->name); + goto cleanup; + } + } + } else { + VIR_WARN("CPU cgroup is disabled in qemu configuration file: %s", + vm->def->name); + } + done: virCgroupFree(&cgroup); return 0;