iocost_monitor: start from the oldest usage index

iocg usage_idx is the latest usage index, we should start from the
oldest usage index to show the consecutive NR_USAGE_SLOTS usages.

Signed-off-by: Chengming Zhou <[email protected]>
Acked-by: Tejun Heo <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>

Author: Chengming Zhou

tools/cgroup/iocost_monitor.py

@@ -173,7 +173,7 @@ def __init__(self, iocg):
         self.usages = []
         self.usage = 0
         for i in range(NR_USAGE_SLOTS):
-            usage = iocg.usages[(usage_idx + i) % NR_USAGE_SLOTS].value_()
+            usage = iocg.usages[(usage_idx + 1 + i) % NR_USAGE_SLOTS].value_()
             upct = usage * 100 / HWEIGHT_WHOLE
             self.usages.append(upct)
             self.usage = max(self.usage, upct)