[libvirt] [PATCHv4 02/18] util: Introduce resctrl monitor for CMT
Cache Monitoring Technology (aka CMT) provides the capability
to report cache utilization information of system task.
This patch introduces the concept of resctrl monitor through
data structure virResctrlMonitor.
Signed-off-by: Wang Huaqiang <huaqiang.wang(a)intel.com>
---
src/libvirt_private.syms | 1 +
src/util/virresctrl.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++
src/util/virresctrl.h | 7 ++++++
3 files changed, 64 insertions(+)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 9236391..754578f 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -2677,6 +2677,7 @@ virResctrlInfoGetCache;
virResctrlInfoGetMonitorPrefix;
virResctrlInfoMonFree;
virResctrlInfoNew;
+virResctrlMonitorNew;
# util/virrotatingfile.h
diff --git a/src/util/virresctrl.c b/src/util/virresctrl.c
index 74d9b6b..bd36406 100644
--- a/src/util/virresctrl.c
+++ b/src/util/virresctrl.c
@@ -105,6 +105,7 @@ typedef virResctrlAllocMemBW *virResctrlAllocMemBWPtr;
/* Class definitions and initializations */
static virClassPtr virResctrlInfoClass;
static virClassPtr virResctrlAllocClass;
+static virClassPtr virResctrlMonitorClass;
/* virResctrlInfo */
@@ -319,6 +320,35 @@ struct _virResctrlAlloc {
char *path;
};
+/* virResctrlMonitor */
+
+/*
+ * virResctrlMonitor is the data structure for resctrl monitor. Resctrl
+ * monitor represents a resctrl monitoring group, which can be used to
+ * monitor the resource utilization information for either cache or
+ * memory bandwidth.
+ *
+ * From hardware perspective, cache monitoring technology (CMT), memory
+ * bandwidth technology (MBM), as well as the CAT and MBA, are all orthogonal
+ * features. The monitor will be created under the scope of default allocation
+ * if no CAT or MBA supported in the system.
+ */
+struct _virResctrlMonitor {
+ virObject parent;
+
+ /* In resctrl, each monitor is associated with one specific allocation,
+ * either the allocation under /sys/fs/resctrl or the default allocation.
+ * If this pointer is NULL, then the monitor will be associated with
+ * default allocation, otherwise, this pointer points to the allocation
+ * this monitor associated with. */
+ virResctrlAllocPtr alloc;
+ /* The monitor identifier */
+ char *id;
+ /* libvirt-generated path in /sys/fs/resctrl for this particular
+ * monitor */
+ char *path;
+};
+
static void
virResctrlAllocDispose(void *obj)
@@ -368,6 +398,17 @@ virResctrlAllocDispose(void *obj)
}
+static void
+virResctrlMonitorDispose(void *obj)
+{
+ virResctrlMonitorPtr monitor = obj;
+
+ virObjectUnref(monitor->alloc);
+ VIR_FREE(monitor->id);
+ VIR_FREE(monitor->path);
+}
+
+
/* Global initialization for classes */
static int
virResctrlOnceInit(void)
@@ -378,6 +419,9 @@ virResctrlOnceInit(void)
if (!VIR_CLASS_NEW(virResctrlAlloc, virClassForObject()))
return -1;
+ if (!VIR_CLASS_NEW(virResctrlMonitor, virClassForObject()))
+ return -1;
+
return 0;
}
@@ -2374,3 +2418,15 @@ virResctrlAllocRemove(virResctrlAllocPtr alloc)
return ret;
}
+
+
+/* virResctrlMonitor-related definitions */
+
+virResctrlMonitorPtr
+virResctrlMonitorNew(void)
+{
+ if (virResctrlInitialize() < 0)
+ return NULL;
+
+ return virObjectNew(virResctrlMonitorClass);
+}
diff --git a/src/util/virresctrl.h b/src/util/virresctrl.h
index 10505e9..f59a9aa 100644
--- a/src/util/virresctrl.h
+++ b/src/util/virresctrl.h
@@ -185,4 +185,11 @@ int
virResctrlInfoGetMonitorPrefix(virResctrlInfoPtr resctrl,
const char *prefix,
virResctrlInfoMonPtr *monitor);
+
+/* Monitor-related things */
+typedef struct _virResctrlMonitor virResctrlMonitor;
+typedef virResctrlMonitor *virResctrlMonitorPtr;
+
+virResctrlMonitorPtr
+virResctrlMonitorNew(void);
#endif /* __VIR_RESCTRL_H__ */
--
2.7.4