Public bug reported:
In qemuProcessStart() the code looks like this:
VIR_DEBUG("Setting cgroup for emulator (if required)");
if (qemuSetupCgroupForEmulator(vm) < 0)
goto cleanup;
VIR_DEBUG("Setting affinity of emulator threads");
if (qemuProcessSetEmulatorAffinity(vm) < 0)
goto cleanup;
VIR_DEBUG("Waiting for monitor to show up");
if (qemuProcessWaitForMonitor(driver, vm, asyncJob, priv->qemuCaps, pos) <
0)
goto cleanup;
When running on a 24-CPU host and using vCPU and emulator pinning I've seen
cases where the specified emulator pinning isn't applied as expected.
The issue appears to be due to libvirt racing with qemu. Moving the
qemuProcessSetEmulatorAffinity() call to after
qemuProcessWaitForMonitor() returns seems to fix the problem.
Also, I suspect that qemuSetupCgroupForEmulator() should probably be
moved as well.
** Affects: qemu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1441781
Title:
qemuProcessSetEmulatorAffinity() called before emulator process
actually running
Status in QEMU:
New
Bug description:
In qemuProcessStart() the code looks like this:
VIR_DEBUG("Setting cgroup for emulator (if required)");
if (qemuSetupCgroupForEmulator(vm) < 0)
goto cleanup;
VIR_DEBUG("Setting affinity of emulator threads");
if (qemuProcessSetEmulatorAffinity(vm) < 0)
goto cleanup;
VIR_DEBUG("Waiting for monitor to show up");
if (qemuProcessWaitForMonitor(driver, vm, asyncJob, priv->qemuCaps, pos)
< 0)
goto cleanup;
When running on a 24-CPU host and using vCPU and emulator pinning I've seen
cases where the specified emulator pinning isn't applied as expected.
The issue appears to be due to libvirt racing with qemu. Moving the
qemuProcessSetEmulatorAffinity() call to after
qemuProcessWaitForMonitor() returns seems to fix the problem.
Also, I suspect that qemuSetupCgroupForEmulator() should probably be
moved as well.
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