Re: [libvirt] [PATCH v2 2/3] docs, schema, conf: Add support for setting scheduler parameters of guest threads

In order for QEMU vCPU (and other) threads to run with RT scheduler, libvirt needs to take care of that so QEMU doesn't have to run privileged. Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1178986

Signed-off-by: Martin Kletzander <mkletzan(a)redhat.com&gt; ---

+++ b/docs/formatdomain.html.in @@ -550,6 +550,8 @@ &lt;quota&gt;-1&lt;/quota&gt; &lt;emulator_period&gt;1000000&lt;/emulator_period&gt; &lt;emulator_quota&gt;-1&lt;/emulator_quota&gt; + &lt;vcpusched vcpus='0-4,^3' scheduler='fifo' priority='1'/&gt; + &lt;iothreadsched iothreads='2' scheduler='batch'/&gt; &lt;/cputune&gt; ... &lt;/domain&gt; @@ -652,6 +654,20 @@ <span class="since">Only QEMU driver support since 0.10.0</span> </dd> + <dt><code>vcpusched</code> and <code>iothreadsched</code></dt> + <dd> + The optional <code>vcpusched</code> elements specifie the scheduler + (values <code>batch</code>, <code>idle</code>, <code>fifo</code>, + <code>rr</code>) for particular vCPU/IOThread threads (based on + <code>vcpus</code> and <code>iothreads</code>, leaving out + <code>vcpus</code>/<code>iothreads</code> sets the default). + For real-time schedulers (<code>fifo</code>, <code>rr</code>), + priority must be specified as well (and is ignored for + non-real-time ones). The value range for the priority depends + on the host kernel (usually 1-99). + <span class="since">Since 1.2.12</span>