Re: [PATCH] rudimentary tracing for Classic RCU

[Paul E. McKenney]

On Thu, Oct 09, 2008 at 08:55:29AM +0200, Andi Kleen wrote:
> > In this case, why not define it as:
> > static char buf[20*NR_CPUS + 100];
> 
> Actually you should near never use NR_CPUS now but always num_possible_cpus()
> (or even num_online_cpus()) Using NR_CPUS can lead to extreme waste
> of memory on kernels which are compiled for 4096 CPUs for example.
> 
> And with num_possible_cpus() kmalloc is needed.

OK, new one on me!  Thank you for the pointer!

							Thanx, Paul
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