Re: sched: 64-bit nr_running

[Daniel Walker]

On Mon, 2006-05-15 at 18:25 +0200, Ingo Molnar wrote:
> * Daniel Walker <dwalker@xxxxxxxxxx> wrote:
> 
> > There was a conversation over the mtd redboot bug related to unsigned 
> > long vs. unsigned int . On a 64-bit machine unsigned long is 64-bits , 
> > and unsigned int is 32-bits . However, both are 32-bits on a 32-bit 
> > machine .
> > 
> > Looking over the scheduler I found a few places that use "unsigned 
> > long" for task counting variables (nr_running, nr_active, 
> > nr_interruptible) . The problem is that these variables are all bound 
> > to 29 bits (according to kernel/pid.c) , but they get expanded to 
> > 64-bits on 64-bit machines .
> 
> your point being?


We could make them unsigned int, and save the extra bits .. Or that's
what I was thinking about ..

Daniel

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