use iterator to loop over first 1000 entries (#2359)

selfdrive/debug/live_cpu_and_temp.py

@@ -49,7 +49,7 @@ if __name__ == "__main__":
 
     if sm.updated['thermal']:
       t = sm['thermal']
-      last_temp = np.mean([t.cpu0, t.cpu1, t.cpu2, t.cpu3]) / 10.
+      last_temp = np.mean(t.cpu)
       last_mem = t.memUsedPercent
 
     if sm.updated['procLog']:

selfdrive/tombstoned.py

@@ -17,10 +17,12 @@ def get_tombstones():
   files = []
   for folder in ["/data/tombstones/", "/var/crash/"]:
     if os.path.exists(folder):
-      for fn in os.listdir(folder):
-        if fn.startswith("tombstone") or fn.endswith(".crash"):
-          path = os.path.join(folder, fn)
-          files.append((path, int(os.stat(path).st_ctime)))
+      with os.scandir(folder) as d:
+
+        # Loop over first 1000 directory entries
+        for _, f in zip(range(1000), d):
+          if f.name.startswith("tombstone") or f.name.endswith(".crash"):
+            files.append((f.path, int(f.stat().st_ctime)))
   return files