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qemu: leave restricting cpuset.mems after initialization

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When domain is started with numatune memory mode strict and the
nodeset does not include host NUMA node with DMA and DMA32 zones, KVM
initialization fails.  This is because cgroup restrict even kernel
allocations.  We are already doing numa_set_membind() which does the
same thing, only it does not restrict kernel allocations.

This patch leaves the userspace numa_set_membind() in place and moves
the cpuset.mems setting after the point where monitor comes up, but
before vcpu and emulator sub-groups are created.

Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
This commit is contained in:
Martin Kletzander 2014-07-08 09:59:49 +02:00
parent aa668fccf0
commit 7e72ac7878
3 changed files with 14 additions and 4 deletions
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10
src/qemu/qemu_cgroup.c
View File

@ -627,9 +627,6 @@ qemuSetupCpusetCgroup(virDomainObjPtr vm,
if (!virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPUSET))
return 0;
if (qemuSetupCpusetMems(vm, nodemask) < 0)
goto cleanup;
if (vm->def->cpumask ||
(vm->def->placement_mode == VIR_DOMAIN_CPU_PLACEMENT_MODE_AUTO)) {
@ -825,6 +822,13 @@ qemuSetupCgroup(virQEMUDriverPtr driver,
return ret;
}
int
qemuSetupCgroupPostInit(virDomainObjPtr vm,
virBitmapPtr nodemask)
{
return qemuSetupCpusetMems(vm, nodemask);
}
int
qemuSetupCgroupVcpuBW(virCgroupPtr cgroup,
unsigned long long period,

4
src/qemu/qemu_cgroup.h
View File

@ -1,7 +1,7 @@
/*
* qemu_cgroup.h: QEMU cgroup management
*
* Copyright (C) 2006-2007, 2009-2013 Red Hat, Inc.
* Copyright (C) 2006-2007, 2009-2014 Red Hat, Inc.
* Copyright (C) 2006 Daniel P. Berrange
*
* This library is free software; you can redistribute it and/or
@ -47,6 +47,8 @@ int qemuConnectCgroup(virQEMUDriverPtr driver,
int qemuSetupCgroup(virQEMUDriverPtr driver,
virDomainObjPtr vm,
virBitmapPtr nodemask);
int qemuSetupCgroupPostInit(virDomainObjPtr vm,
virBitmapPtr nodemask);
int qemuSetupCgroupVcpuBW(virCgroupPtr cgroup,
unsigned long long period,
long long quota);

4
src/qemu/qemu_process.c
View File

@ -4155,6 +4155,10 @@ int qemuProcessStart(virConnectPtr conn,
if (!qemuProcessVerifyGuestCPU(driver, vm))
goto cleanup;
VIR_DEBUG("Setting up post-init cgroup restrictions");
if (qemuSetupCgroupPostInit(vm, nodemask) < 0)
goto cleanup;
VIR_DEBUG("Detecting VCPU PIDs");
if (qemuProcessDetectVcpuPIDs(driver, vm) < 0)
goto cleanup;