Btw, jiffies is now stored as a 64 bit variable internally in the kernel (not 32 bit), although to maintain compatibility with the older code, it can be still 'treated' as a 32-bit variable. In reality, overflow would take a lot more time than 497 days, but if you read only the first 32 bits, then you are right about the 497 day thing.

~Gaurav

On Thu, Sep 20, 2012 at 8:30 PM, Dave Hylands <dhylands@gmail.com> wrote:

Hi,

On Thu, Sep 20, 2012 at 7:09 AM, Fan Yang <lljyangfan@gmail.com> wrote:
> hi all:
> As far as I known, the var jiffies in the kernel will overflow after
> 497days as the Hz defined 100. So what waill happen when the jiffies
> overflow?

It will start back at zero.

Everything should continue to work as before.

In fact, jiffies are initialized to -300 seconds, so that it will
overflow 5 minutes after startup, just to verify that everything works
properly.

--
Dave Hylands
Shuswap, BC, Canada
http://www.davehylands.com

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Gaurav Jain

Associate Software Engineer

VxVM Escalations Team, SAMG

Symantec Software India Pvt. Ltd.