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qemu: Migrate memory on numatune change

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We've never set the cpuset.memory_migrate value to anything, keeping it
on default.  However, we allow changing cpuset.mems on live domain.
That setting, however, don't have any consequence on a domain unless
it's going to allocate new memory.

I managed to make 'virsh numatune' move all the memory to any node I
wanted even without disabling libnuma's numa_set_membind(), so this
should be safe to use with it as well.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1198497

Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
This commit is contained in:
Martin Kletzander 2015-03-11 11:17:15 +01:00
parent ba1dfc5b6a
commit 3a0e5b0c20
1 changed files with 35 additions and 1 deletions
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36
src/qemu/qemu_cgroup.c
View File

@ -1,7 +1,7 @@
/*
* qemu_cgroup.c: QEMU cgroup management
*
* Copyright (C) 2006-2014 Red Hat, Inc.
* Copyright (C) 2006-2015 Red Hat, Inc.
* Copyright (C) 2006 Daniel P. Berrange
*
* This library is free software; you can redistribute it and/or
@ -652,6 +652,9 @@ qemuSetupCpusetCgroup(virDomainObjPtr vm,
if (!virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPUSET))
return 0;
if (virCgroupSetCpusetMemoryMigrate(priv->cgroup, true) < 0)
return -1;
if (vm->def->cpumask ||
(vm->def->placement_mode == VIR_DOMAIN_CPU_PLACEMENT_MODE_AUTO)) {
@ -792,9 +795,12 @@ static void
qemuRestoreCgroupState(virDomainObjPtr vm)
{
char *mem_mask = NULL;
char *nodeset = NULL;
int empty = -1;
qemuDomainObjPrivatePtr priv = vm->privateData;
size_t i = 0;
virBitmapPtr all_nodes;
virCgroupPtr cgroup_temp = NULL;
if (!(all_nodes = virNumaGetHostNodeset()))
goto error;
@ -809,9 +815,37 @@ qemuRestoreCgroupState(virDomainObjPtr vm)
if (virCgroupSetCpusetMems(priv->cgroup, mem_mask) < 0)
goto error;
for (i = 0; i < priv->nvcpupids; i++) {
if (virCgroupNewVcpu(priv->cgroup, i, false, &cgroup_temp) < 0 ||
virCgroupSetCpusetMemoryMigrate(cgroup_temp, true) < 0 ||
virCgroupGetCpusetMems(cgroup_temp, &nodeset) < 0 ||
virCgroupSetCpusetMems(cgroup_temp, nodeset) < 0)
goto cleanup;
virCgroupFree(&cgroup_temp);
}
for (i = 0; i < priv->niothreadpids; i++) {
if (virCgroupNewIOThread(priv->cgroup, i + 1, false, &cgroup_temp) < 0 ||
virCgroupSetCpusetMemoryMigrate(cgroup_temp, true) < 0 ||
virCgroupGetCpusetMems(cgroup_temp, &nodeset) < 0 ||
virCgroupSetCpusetMems(cgroup_temp, nodeset) < 0)
goto cleanup;
virCgroupFree(&cgroup_temp);
}
if (virCgroupNewEmulator(priv->cgroup, false, &cgroup_temp) < 0 ||
virCgroupSetCpusetMemoryMigrate(cgroup_temp, true) < 0 ||
virCgroupGetCpusetMems(cgroup_temp, &nodeset) < 0 ||
virCgroupSetCpusetMems(cgroup_temp, nodeset) < 0)
goto cleanup;
cleanup:
VIR_FREE(mem_mask);
VIR_FREE(nodeset);
virBitmapFree(all_nodes);
virCgroupFree(&cgroup_temp);
return;
error: