Re: [PATCH V3] Fix Committed_AS underflow

[Dave Hansen]

On Mon, 2009-04-20 at 10:09 +0100, Eric B Munson wrote:
> 1. Change NR_CPUS to min(64, NR_CPUS)
>    This will limit the amount of possible skew on kernels compiled for very
>    large SMP machines.  64 is an arbitrary number selected to limit the worst
>    of the skew without using more cache lines.  min(64, NR_CPUS) is used
>    instead of nr_online_cpus() because nr_online_cpus() requires a shared
>    cache line and a call to hweight to make the calculation.  Its runtime
>    overhead and keeping this counter accurate showed up in profiles and it's
>    possible that nr_online_cpus() would also show.



-- Dave

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