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util: Add interface to determine monitor path
Add interface for resctrl monitor to determine the path. Signed-off-by: Wang Huaqiang <huaqiang.wang@intel.com> Reviewed-by: John Ferlan <jferlan@redhat.com>
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@ -2681,6 +2681,7 @@ virResctrlInfoGetCache;
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virResctrlInfoGetMonitorPrefix;
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virResctrlInfoMonFree;
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virResctrlInfoNew;
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virResctrlMonitorDeterminePath;
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virResctrlMonitorNew;
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@ -2462,3 +2462,62 @@ virResctrlMonitorNew(void)
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return virObjectNew(virResctrlMonitorClass);
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}
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/*
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* virResctrlMonitorDeterminePath
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*
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* @monitor: Pointer to a resctrl monitor
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* @machinename: Name string of the VM
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*
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* Determines the directory path that the underlying resctrl group will be
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* created with.
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*
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* A monitor represents a directory under resource control file system,
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* its directory path could be the same path as @monitor->alloc, could be a
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* path of directory under 'mon_groups' of @monitor->alloc, or a path of
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* directory under '/sys/fs/resctrl/mon_groups' if @monitor->alloc is NULL.
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*
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* Returns 0 on success, -1 on error.
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*/
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int
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virResctrlMonitorDeterminePath(virResctrlMonitorPtr monitor,
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const char *machinename)
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{
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VIR_AUTOFREE(char *) parentpath = NULL;
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if (!monitor) {
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virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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_("Invalid resctrl monitor"));
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return -1;
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}
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if (!monitor->alloc) {
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virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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_("Missing resctrl monitor alloc"));
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return -1;
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}
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if (monitor->path) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("Resctrl monitor path is already set to '%s'"),
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monitor->path);
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return -1;
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}
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if (STREQ_NULLABLE(monitor->id, monitor->alloc->id)) {
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if (VIR_STRDUP(monitor->path, monitor->alloc->path) < 0)
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return -1;
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return 0;
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}
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if (virAsprintf(&parentpath, "%s/mon_groups", monitor->alloc->path) < 0)
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return -1;
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monitor->path = virResctrlDeterminePath(parentpath, machinename,
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monitor->id);
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if (!monitor->path)
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return -1;
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return 0;
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}
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@ -191,7 +191,10 @@ virResctrlInfoGetMonitorPrefix(virResctrlInfoPtr resctrl,
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typedef struct _virResctrlMonitor virResctrlMonitor;
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typedef virResctrlMonitor *virResctrlMonitorPtr;
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virResctrlMonitorPtr
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virResctrlMonitorNew(void);
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int
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virResctrlMonitorDeterminePath(virResctrlMonitorPtr monitor,
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const char *machinename);
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#endif /* __VIR_RESCTRL_H__ */
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