Hi,
On Thu, Jul 17, 2008 at 12:07 PM, Wang Yu <wangyuict@xxxxxxxxx> wrote:
> Hi, all
>
> if I input "iostat -dx" in shell, it will output the followings:
>
> Linux 2.6.20 (genode003) 07/17/2008
>
> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s
> avgrq-sz avgqu-sz await svctm %util
> sda 0.02 0.68 0.10 0.28 2.34 7.71 1.17 3.85
> 26.05 0.01 14.26 1.48 0.06
>
> I want to get the %util field in kernel space, what can i do? or how can I
> calculate this value by other means?
You need to look 2.6.20 kernel source. %util is actually coming
from output of
cat /proc/diskstat and you can find its source code in block/genhd.c line no.586
I think its %utils is output of jiffies_to_msecs(disk_stat_read(gp,
time_in_queue)).
Check that code and work on what you need.
Regards,
Parag.
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