[REPOST 3/4] Revert "qemu: do not put a task into machine cgroup"

[John Ferlan <jferlan@xxxxxxxxxx>]

This reverts commit a41c00b472efaa192d2deae51ab732e65903238f.

The patch was causing erroneous updates to the /proc/$pid/cgroup file.
This resulted in some unexpected behavoirs.

Signed-off-by: John Ferlan <jferlan@xxxxxxxxxx>
---
 src/qemu/qemu_cgroup.c  | 15 +++++++++++----
 src/qemu/qemu_process.c | 12 ++++++------
 2 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/src/qemu/qemu_cgroup.c b/src/qemu/qemu_cgroup.c
index 515d76a..16c6492 100644
--- a/src/qemu/qemu_cgroup.c
+++ b/src/qemu/qemu_cgroup.c
@@ -789,6 +789,17 @@ qemuInitCgroup(virQEMUDriverPtr driver,
         goto cleanup;
     }
 
+    if (virCgroupAddTask(priv->cgroup, vm->pid) < 0) {
+        virErrorPtr saved = virSaveLastError();
+        virCgroupRemove(priv->cgroup);
+        virCgroupFree(&priv->cgroup);
+        if (saved) {
+            virSetError(saved);
+            virFreeError(saved);
+        }
+        goto cleanup;
+    }
+
  done:
     ret = 0;
  cleanup:
@@ -1157,10 +1168,6 @@ qemuSetupCgroupForEmulator(virDomainObjPtr vm)
             goto cleanup;
     }
 
-    /* consider the first thread an emulator-thread */
-    if (virCgroupAddTask(cgroup_emulator, vm->pid) < 0)
-        goto cleanup;
-
     virCgroupFree(&cgroup_emulator);
     return 0;
 
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 3d9e0e5..76df860 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -4894,6 +4894,12 @@ qemuProcessLaunch(virConnectPtr conn,
     if (qemuSetupCgroup(driver, vm, nnicindexes, nicindexes) < 0)
         goto cleanup;
 
+    /* This must be done after cgroup placement to avoid resetting CPU
+     * affinity */
+    if (!vm->def->cputune.emulatorpin &&
+        qemuProcessInitCpuAffinity(vm) < 0)
+        goto cleanup;
+
     VIR_DEBUG("Setting domain security labels");
     if (virSecurityManagerSetAllLabel(driver->securityManager,
                                       vm->def,
@@ -4940,12 +4946,6 @@ qemuProcessLaunch(virConnectPtr conn,
     if (qemuSetupCgroupForEmulator(vm) < 0)
         goto cleanup;
 
-    /* This must be done after cgroup placement to avoid resetting CPU
-     * affinity */
-    if (!vm->def->cputune.emulatorpin &&
-        qemuProcessInitCpuAffinity(vm) < 0)
-        goto cleanup;
-
     VIR_DEBUG("Setting affinity of emulator threads");
     if (qemuProcessSetEmulatorAffinity(vm) < 0)
         goto cleanup;
-- 
2.5.0

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