The reason to disable cgroup cpuset by default is: currently,
sub-directories of cgroup cpuset won't be auto-updated if
cpu hot-plug happens. For example, if we now have 0-3,5-7 pcpus
online, the value of /sys/fs/cgroup/cpuset/libvirt/qemu/mydom/cpuset.cpus
is 0-3,5-7, then pcpu 4 is hot-plugged, but the value of cpuset.cpus
is still 0-3,5-7. This will cause a problem that we can't pin
to a hot-plugged pcpu.
Users can still enable cpuset by editing qemu.conf.
---
src/qemu/qemu.conf | 2 +-
src/qemu/qemu_conf.c | 1 -
2 files changed, 1 insertion(+), 2 deletions(-)
diff --git a/src/qemu/qemu.conf b/src/qemu/qemu.conf
index dd853c8..b853852 100644
--- a/src/qemu/qemu.conf
+++ b/src/qemu/qemu.conf
@@ -226,7 +226,7 @@
# can be mounted in different locations. libvirt will detect
# where they are located.
#
-#cgroup_controllers = [ "cpu", "devices", "memory", "blkio", "cpuset", "cpuacct" ]
+#cgroup_controllers = [ "cpu", "devices", "memory", "blkio", "cpuacct" ]
# This is the basic set of devices allowed / required by
# all virtual machines.
diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c
index dc4d680..92c1864 100644
--- a/src/qemu/qemu_conf.c
+++ b/src/qemu/qemu_conf.c
@@ -402,7 +402,6 @@ int qemudLoadDriverConfig(struct qemud_driver *driver,
(1 << VIR_CGROUP_CONTROLLER_DEVICES) |
(1 << VIR_CGROUP_CONTROLLER_MEMORY) |
(1 << VIR_CGROUP_CONTROLLER_BLKIO) |
- (1 << VIR_CGROUP_CONTROLLER_CPUSET) |
(1 << VIR_CGROUP_CONTROLLER_CPUACCT);
}
for (i = 0 ; i < VIR_CGROUP_CONTROLLER_LAST ; i++) {
--
1.7.11.7
--
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