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@xxxxxxxxx>
---
src/libvirt_private.syms | 1 +
src/util/virresctrl.c | 79 ++++++++++++++++++++++++++++++++++++++++++++----
src/util/virresctrl.h | 9 ++++++
3 files changed, 83 insertions(+), 6 deletions(-)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 335210c..d2573c5 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -2680,6 +2680,7 @@ virResctrlInfoGetCache;
virResctrlInfoGetMonitorPrefix;
virResctrlInfoMonFree;
virResctrlInfoNew;
+virResctrlMonitorNew;
# util/virrotatingfile.h
diff --git a/src/util/virresctrl.c b/src/util/virresctrl.c
index 91bd341..6530801 100644
--- a/src/util/virresctrl.c
+++ b/src/util/virresctrl.c
@@ -36,9 +36,9 @@ VIR_LOG_INIT("util.virresctrl")
/* Resctrl is short for Resource Control. It might be implemented for various
- * resources. Currently this supports cache allocation technology (aka CAT) and
- * memory bandwidth allocation (aka MBA). More resources technologies may be
- * added in the future.
+ * resources. Currently this supports cache allocation technology (aka CAT),
+ * memory bandwidth allocation (aka MBA) and cache monitoring technology (aka
+ * CMT). More resources technologies may be added in the future.
*/
@@ -105,6 +105,7 @@ typedef virResctrlAllocMemBW *virResctrlAllocMemBWPtr;
/* Class definitions and initializations */
static virClassPtr virResctrlInfoClass;
static virClassPtr virResctrlAllocClass;
+static virClassPtr virResctrlMonitorClass;
/* virResctrlInfo */
@@ -224,11 +225,16 @@ virResctrlInfoMonFree(virResctrlInfoMonPtr mon)
}
-/* virResctrlAlloc */
+/* virResctrlAlloc and virResctrlMonitor*/
/*
- * virResctrlAlloc represents one allocation (in XML under cputune/cachetune and
- * consequently a directory under /sys/fs/resctrl). Since it can have multiple
+ * virResctrlAlloc and virResctrlMonitor are representing a resource control
+ * group (in XML under cputune/cachetune and consequently a directory under
+ * /sys/fs/resctrl). virResctrlAlloc is the data structure for resource
+ * allocation, while the virResctrlMonitor represents the resource monitoring
+ * part.
+ *
+ * virResctrlAlloc represents one allocation. Since it can have multiple
* parts of multiple caches allocated it is represented as bunch of nested
* sparse arrays (by sparse I mean array of pointers so that each might be NULL
* in case there is no allocation for that particular cache allocation (level,
@@ -275,6 +281,18 @@ virResctrlInfoMonFree(virResctrlInfoMonPtr mon)
* a sparse array to represent whether a memory bandwidth allocation happens
* on corresponding node. The available memory controller number is collected
* in 'virResctrlInfo'.
+ *
+ * =====Cache monitoring technology (CMT)=====
+ *
+ * Cache monitoring technology is used to perceive how many cache the process
+ * is using actually. virResctrlMonitor represents the resource control
+ * monitoring group, it is supported to monitor resource utilization
+ * information on granularity of vcpu.
+ *
+ * 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 resctl
+ * group if no specific CAT or MBA entries are provided for the guest."
*/
struct _virResctrlAllocPerType {
/* There could be bool saying whether this is set or not, but since everything
@@ -320,6 +338,29 @@ struct _virResctrlAlloc {
char *path;
};
+/*
+ * 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.
+ */
+struct _virResctrlMonitor {
+ virObject parent;
+
+ /* In resctrl, each monitor is associated with one specific allocation,
+ * either the allocation under / sys / fs / resctrl or allocation of the
+ * root directory itself. This pointer points to the allocation
+ * this monitor associated with. */
+ virResctrlAllocPtr alloc;
+ /* The monitor identifier. For a monitor has the same @path name as its
+ * @alloc, the @id will be set to the same value as it is in @alloc->id.
+ */
+ char *id;
+ /* libvirt-generated path in /sys/fs/resctrl for this particular
+ * monitor */
+ char *path;
+};
+
static void
virResctrlAllocDispose(void *obj)
@@ -369,6 +410,17 @@ 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)
@@ -379,6 +431,9 @@ virResctrlOnceInit(void)
if (!VIR_CLASS_NEW(virResctrlAlloc, virClassForObject()))
return -1;
+ if (!VIR_CLASS_NEW(virResctrlMonitor, virClassForObject()))
+ return -1;
+
return 0;
}
@@ -2373,3 +2428,15 @@ 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..eaa077d 100644
--- a/src/util/virresctrl.h
+++ b/src/util/virresctrl.h
@@ -185,4 +185,13 @@ 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
--
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