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From 72285626fa7b899ceb9c8d4358b4b1b3fa7081a4 Mon Sep 17 00:00:00 2001
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Message-Id: <72285626fa7b899ceb9c8d4358b4b1b3fa7081a4@dist-git>
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From: Martin Kletzander <mkletzan@redhat.com>
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Date: Wed, 31 Jan 2018 16:32:32 +0100
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Subject: [PATCH] qemu: Add support for resctrl
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We've been building up to this. This adds support for cputune/cachetune
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settings for domains in the QEMU driver. The addition into
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qemuProcessSetupVcpu() automatically adds support for hotplug. For hot-unplug
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we need to remove the allocation only if all the vCPUs were unplugged. But
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since the threads are left running, we can't really do much about it now.
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Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1289368
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Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
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(cherry picked from commit 9a2fc2db8fe18da41c274d52b6e52316a4bbe52d)
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Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
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https://bugzilla.redhat.com/show_bug.cgi?id=1289368
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Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
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---
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src/qemu/qemu_process.c | 60 ++++++++++++++++++++++++++++++++++++++++++++-----
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1 file changed, 55 insertions(+), 5 deletions(-)
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diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
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index c64088e4ca..57faf9cd79 100644
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--- a/src/qemu/qemu_process.c
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+++ b/src/qemu/qemu_process.c
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@@ -2504,6 +2504,32 @@ qemuProcessSetupEmulator(virDomainObjPtr vm)
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}
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+static int
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+qemuProcessResctrlCreate(virQEMUDriverPtr driver,
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+ virDomainObjPtr vm)
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+{
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+ int ret = -1;
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+ size_t i = 0;
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+ virCapsPtr caps = virQEMUDriverGetCapabilities(driver, false);
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+ qemuDomainObjPrivatePtr priv = vm->privateData;
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+
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+ if (!caps)
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+ return -1;
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+
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+ for (i = 0; i < vm->def->ncachetunes; i++) {
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+ if (virResctrlAllocCreate(caps->host.resctrl,
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+ vm->def->cachetunes[i]->alloc,
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+ priv->machineName) < 0)
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+ goto cleanup;
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+ }
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+
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+ ret = 0;
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+ cleanup:
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+ virObjectUnref(caps);
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+ return ret;
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+}
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+
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+
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static int
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qemuProcessInitPasswords(virConnectPtr conn,
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virQEMUDriverPtr driver,
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@@ -5015,12 +5041,26 @@ qemuProcessSetupVcpu(virDomainObjPtr vm,
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{
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pid_t vcpupid = qemuDomainGetVcpuPid(vm, vcpuid);
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virDomainVcpuDefPtr vcpu = virDomainDefGetVcpu(vm->def, vcpuid);
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+ size_t i = 0;
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- return qemuProcessSetupPid(vm, vcpupid, VIR_CGROUP_THREAD_VCPU,
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- vcpuid, vcpu->cpumask,
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- vm->def->cputune.period,
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- vm->def->cputune.quota,
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- &vcpu->sched);
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+ if (qemuProcessSetupPid(vm, vcpupid, VIR_CGROUP_THREAD_VCPU,
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+ vcpuid, vcpu->cpumask,
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+ vm->def->cputune.period,
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+ vm->def->cputune.quota,
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+ &vcpu->sched) < 0)
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+ return -1;
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+
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+ for (i = 0; i < vm->def->ncachetunes; i++) {
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+ virDomainCachetuneDefPtr ct = vm->def->cachetunes[i];
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+
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+ if (virBitmapIsBitSet(ct->vcpus, vcpuid)) {
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+ if (virResctrlAllocAddPID(ct->alloc, vcpupid) < 0)
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+ return -1;
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+ break;
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+ }
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+ }
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+
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+ return 0;
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}
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@@ -5892,6 +5932,10 @@ qemuProcessLaunch(virConnectPtr conn,
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if (qemuProcessSetupEmulator(vm) < 0)
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goto cleanup;
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+ VIR_DEBUG("Setting up resctrlfs");
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+ if (qemuProcessResctrlCreate(driver, vm) < 0)
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+ goto cleanup;
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+
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VIR_DEBUG("Setting domain security labels");
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if (qemuSecuritySetAllLabel(driver,
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vm,
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@@ -6540,6 +6584,12 @@ void qemuProcessStop(virQEMUDriverPtr driver,
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vm->def->name);
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}
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+ /* Remove resctrl allocation after cgroups are cleaned up which makes it
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+ * kind of safer (although removing the allocation should work even with
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+ * pids in tasks file */
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+ for (i = 0; i < vm->def->ncachetunes; i++)
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+ virResctrlAllocRemove(vm->def->cachetunes[i]->alloc);
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+
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qemuProcessRemoveDomainStatus(driver, vm);
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/* Remove VNC and Spice ports from port reservation bitmap, but only if
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--
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2.16.1
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