[virt-tools-list] [PATCH] Attempt empty path on virDomainBlockStats

[Thorsten Behrens]

libvirt for some backends yields summary domain stats for empty
disk path - which saves us the looping on our side.
---
Note:
 - recent change for lxc driver in libvirt, will be in the 1.2.2
   release
 - tries only once, so hopefully acceptable for all domain flavours

 virtManager/domain.py | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/virtManager/domain.py b/virtManager/domain.py
index 8d0c95f..8716af8 100644
--- a/virtManager/domain.py
+++ b/virtManager/domain.py
@@ -270,6 +270,7 @@ class vmmDomain(vmmLibvirtObject):
         self._enable_disk_poll = False
         self._stats_disk_supported = True
         self._stats_disk_skip = []
+        self._summary_disk_stats_skip = False
 
         self.inspection = vmmInspectionData()
 
@@ -1769,6 +1770,18 @@ class vmmDomain(vmmLibvirtObject):
             self._stats_disk_skip = []
             return rd, wr
 
+        # attempt to retrieve summary stats for domain
+        if not self._summary_disk_stats_skip:
+            try:
+                io = self._backend.blockStats('')
+                if io:
+                    rd = io[1]
+                    wr = io[3]
+                    return rd, wr
+            except libvirt.libvirtError:
+                self._summary_disk_stats_skip = True
+
+        # did not work, iterate over all disks
         for disk in self.get_disk_devices(refresh_if_nec=False):
             dev = disk.target
             if not dev:
-- 
1.8.4.5