On Tue, Jan 22, 2013 at 11:21 AM, sandeep kumar
[off-list ref] wrote:

Hi all
As far as I know jiffie counter is incremented HZ times/second. And it is
used to measure the time lapses in the kernel code.

I m seeing a case where, actualy time spent in some module using giffies is
zero, but while seeing UART logs i am seein 2 sec time difference. I dont

Please post the code here regarding how did you find out it is zero.

know how to interpret this. The case which i am seeing, hrtimers are not
enabled yet, so only thing i can rely are on jiffies.

My question here is,
Is it possible that the measured time lapse shown is "0"(jiffie count is
same before and after), but actually some time is spent?(say some 2 sec)

In another way..can jiffies may freeze for some time?

Is your watchdog enabled?If it is then you will see panic happening
i.e. soft lockup.

Please clarify...


--
With regards,
Sandeep Kumar Anantapalli,

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