On 02/10/2015 08:35 AM, Martin Kletzander wrote:
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
Might be nice to also show a sample XML usage in the commit message.
Signed-off-by: Martin Kletzander <mkletzan@redhat.com> ---
+++ b/docs/formatdomain.html.in @@ -550,6 +550,8 @@ <quota>-1</quota> <emulator_period>1000000</emulator_period> <emulator_quota>-1</emulator_quota> + <vcpusched vcpus='0-4,^3' scheduler='fifo' priority='1'/> + <iothreadsched iothreads='2' scheduler='batch'/> </cputune> ... </domain> @@ -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>
1.2.13, actually. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org