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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 <zhouchengming@bytedance.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Chengming Zhou 2020-07-30 20:31:04 +08:00 committed by Jens Axboe
parent d9012a59db
commit 1bf6ece573
1 changed files with 1 additions and 1 deletions
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tools/cgroup/iocost_monitor.py
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@ -173,7 +173,7 @@ class IocgStat:
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)