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[libvirt] [PATH v9 05/12] Qemu: Set cache tune while booting a new domain.



While user can assign some specific vcpus list in <cachetune>, adds the
vcpus' pids to cache bank, else vm->pid will be added to cache bank.

Signed-off-by: Eli Qiao <liyong qiao intel com>
---
 src/qemu/qemu_driver.c  |  6 ++++--
 src/qemu/qemu_process.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+), 2 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 7995511..1e3ed1a 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -850,8 +850,10 @@ qemuStateInitialize(bool privileged,
         run_gid = cfg->group;
     }
 
-    if (virResCtrlAvailable() && virResCtrlInit() < 0)
-        VIR_WARN("Faild to initialize resource control.");
+    if (virResCtrlAvailable() && virResCtrlInit() < 0) {
+        VIR_ERROR(_("Faild to initialize resource control"));
+        goto error;
+    }
 
     qemu_driver->qemuCapsCache = virQEMUCapsCacheNew(cfg->libDir,
                                                      cfg->cacheDir,
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 184440d..f3e1c4c 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -76,6 +76,7 @@
 #include "configmake.h"
 #include "nwfilter_conf.h"
 #include "netdev_bandwidth_conf.h"
+#include "virresctrl.h"
 
 #define VIR_FROM_THIS VIR_FROM_QEMU
 
@@ -5021,6 +5022,50 @@ qemuProcessVcpusSortOrder(const void *a,
     return vcpua->order - vcpub->order;
 }
 
+static int
+qemuProcessSetCacheBanks(virDomainObjPtr vm)
+{
+    size_t i, j;
+    virDomainCachetunePtr cachetune;
+    unsigned int max_vcpus = virDomainDefGetVcpusMax(vm->def);
+    pid_t *pids = NULL;
+    virDomainVcpuDefPtr vcpu;
+    size_t npid = 0;
+    size_t count = 0;
+    int ret = -1;
+
+    cachetune = &(vm->def->cachetune);
+
+    for (i = 0; i < cachetune->n_banks; i++) {
+        if (cachetune->cache_banks[i].vcpus) {
+            for (j = 0; j < max_vcpus; j++) {
+                if (virBitmapIsBitSet(cachetune->cache_banks[i].vcpus, j)) {
+
+                    vcpu = virDomainDefGetVcpu(vm->def, j);
+                    if (!vcpu->online)
+                        continue;
+
+                    if (VIR_RESIZE_N(pids, npid, count, 1) < 0)
+                        goto cleanup;
+                    pids[count ++] = qemuDomainGetVcpuPid(vm, j);
+                }
+            }
+        }
+    }
+
+    /* If not specific vcpus in cachetune, add vm->pid */
+    if (pids == NULL) {
+        if (VIR_ALLOC_N(pids, 1) < 0)
+            goto cleanup;
+        pids[0] = vm->pid;
+        count = 1;
+    }
+    ret = virResCtrlSetCacheBanks(cachetune, vm->def->uuid, pids, count);
+
+ cleanup:
+    VIR_FREE(pids);
+    return ret;
+}
 
 static int
 qemuProcessSetupHotpluggableVcpus(virQEMUDriverPtr driver,
@@ -5714,6 +5759,11 @@ qemuProcessLaunch(virConnectPtr conn,
         qemuProcessAutoDestroyAdd(driver, vm, conn) < 0)
         goto cleanup;
 
+    VIR_DEBUG("Cache allocation");
+
+    if (virResCtrlAvailable() && qemuProcessSetCacheBanks(vm) < 0)
+        goto cleanup;
+
     ret = 0;
 
  cleanup:
@@ -6216,6 +6266,10 @@ void qemuProcessStop(virQEMUDriverPtr driver,
     virPerfFree(priv->perf);
     priv->perf = NULL;
 
+    if (virResCtrlAvailable() && virResCtrlUpdate(vm->def->uuid) < 0)
+        VIR_WARN("Failed to update resource control for %s",
+                 vm->def->name);
+
     qemuProcessRemoveDomainStatus(driver, vm);
 
     /* Remove VNC and Spice ports from port reservation bitmap, but only if
-- 
1.9.1


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