On Tue, 2 May 2006, Andi Kleen wrote:
> On Tuesday 02 May 2006 18:50, Russell King wrote:
>
> > You're right assuming you have a 64-bit TSC, but ARM has at best a
> > 32-bit cycle counter which rolls over about every 179 seconds - with
> > gives a range of values from sched_clock from 0 to 178956970625 or
> > 0x29AAAAAA81.
> >
> > That's rather more of a problem than having it happen every 208 days.
>
> Ok but you know it's always 32bit right? You can fix it up then
> with your proposal of a sched_diff()
>
> The problem would be fixing it up with a unknown number of bits.
Just shift it left so you know you always have the most significant bits
valid. The sched_diff() would take care of scaling it back to nanosecs.
Nicolas
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
