[libvirt] [PATCHv8 04/17] util: Add interface to determine monitor path
Add interface for resctrl monitor to determine the path.
Signed-off-by: Wang Huaqiang <huaqiang.wang(a)intel.com>
Reviewed-by: John Ferlan <jferlan(a)redhat.com>
---
src/libvirt_private.syms | 1 +
src/util/virresctrl.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++
src/util/virresctrl.h | 5 ++++-
3 files changed, 60 insertions(+), 1 deletion(-)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index d2573c5..5235046 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -2680,6 +2680,7 @@ virResctrlInfoGetCache;
virResctrlInfoGetMonitorPrefix;
virResctrlInfoMonFree;
virResctrlInfoNew;
+virResctrlMonitorDeterminePath;
virResctrlMonitorNew;
diff --git a/src/util/virresctrl.c b/src/util/virresctrl.c
index 463555c..aa062c3 100644
--- a/src/util/virresctrl.c
+++ b/src/util/virresctrl.c
@@ -2462,3 +2462,58 @@ virResctrlMonitorNew(void)
return virObjectNew(virResctrlMonitorClass);
}
+
+
+/*
+ * virResctrlMonitorDeterminePath
+ *
+ * @monitor: Pointer to a resctrl monitor
+ * @machinename: Name string of the VM
+ *
+ * Determines the directory path that the underlying resctrl group will be
+ * created with.
+ *
+ * A monitor represents a directory under resource control file system,
+ * its directory path could be the same path as @monitor->alloc, could be a
+ * path of directory under 'mon_groups' of @monitor->alloc, or a path of
+ * directory under '/sys/fs/resctrl/mon_groups' if @monitor->alloc is NULL.
+ *
+ * Returns 0 on success, -1 on error.
+ */
+int
+virResctrlMonitorDeterminePath(virResctrlMonitorPtr monitor,
+ const char *machinename)
+{
+ VIR_AUTOFREE(char *) parentpath = NULL;
+
+ if (!monitor) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("Invalid resctrl monitor"));
+ return -1;
+ }
+
+ if (monitor->path) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("Resctrl monitor path is already set to
'%s'"),
+ monitor->path);
+ return -1;
+ }
+
+ if (monitor->id && monitor->alloc && monitor->alloc->id)
{
+ if (STREQ(monitor->id, monitor->alloc->id)) {
+ if (VIR_STRDUP(monitor->path, monitor->alloc->path) < 0)
+ return -1;
+ return 0;
+ }
+ }
+
+ if (virAsprintf(&parentpath, "%s/mon_groups",
monitor->alloc->path) < 0)
+ return -1;
+
+ monitor->path = virResctrlDeterminePath(parentpath, machinename,
+ monitor->id);
+ if (!monitor->path)
+ return -1;
+
+ return 0;
+}
diff --git a/src/util/virresctrl.h b/src/util/virresctrl.h
index eaa077d..baae554 100644
--- a/src/util/virresctrl.h
+++ b/src/util/virresctrl.h
@@ -191,7 +191,10 @@ virResctrlInfoGetMonitorPrefix(virResctrlInfoPtr resctrl,
typedef struct _virResctrlMonitor virResctrlMonitor;
typedef virResctrlMonitor *virResctrlMonitorPtr;
-
virResctrlMonitorPtr
virResctrlMonitorNew(void);
+
+int
+virResctrlMonitorDeterminePath(virResctrlMonitorPtr monitor,
+ const char *machinename);
#endif /* __VIR_RESCTRL_H__ */
--
2.7.4