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After introducing commit 5b18b5a73760 ("block: delete part_round_stats
and switch to less precise counting"), '%util' accounted by iostat
will be over reality data. In fact, the device is quite idle, but
iostat may show '%util' as a big number (e.g. 50%). It can produce by fio:
fio --name=1 --direct=1 --bs=4k --rw=read --filename=/dev/sda \
--thinktime=4ms --runtime=180
We fix this by using a switch(precise_iostat=1) to control whether or not
acconut ioticks precisely.
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