Re: 2.6.23-rc2-mm1: rcutorture xtime usage

Andrew Morton
2007-08-10T17:12:47Z

On Fri, 10 Aug 2007 08:12:08 -0700 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> wrote:

> > One used to use sched_clock() for this, then get frowned at. Now we
> > have cpu_clock()...
>
> Hmmm... And cpu_clock() is not in 2.6.22, so must appear in some later
> release. Which means that the rate of API change in this area is a
> bit high, so I should avoid it like the plague.

eh, it's been there for weeks. It is dust-encrusted.

> Therefore, I should
> look for some other convenient source of entropy.
>
> One convenient source would the per-CPU statistics that rcutorture
> maintains. Of course, a given CPU's RNG is nearly in lock-step with
> its own statistics, but not with the adjacent CPU's statistics...
>
> I will send a patch.

Please use cpu_clock(). It ain't going away.