Re: [PATCH] cpumask 5/10 rewrite cpumask.h - single bitmap based implementation

William Lee Irwin III
2004-06-04T18:44:02Z

William Lee Irwin III wrote:
>> Without any way to reliably determine this, luserspace is fscked.

On Fri, Jun 04, 2004 at 11:42:19AM -0700, Paul Jackson wrote:
> I don't see why user code needs to determine NR_CPUS exactly. Any
> reasonable upper bound should work - reasonable meaning doesn't waste
> too many unused words of memory.
> It's not really NR_CPUS that users need - its a reasonably close upper
> bound to the size of the space that sched_getaffinity() must be provided
> they need. And your code does a pretty good job of providing that.

Wrong. Apps that want to reconfigure the system to e.g. online more cpus
in response to heightened load want to know.

-- wli