On Fri, 8 Sep 2006, Christoph Lameter wrote:
> > one or more, it is unnecessary for the common case.
>
> The common case is an arch with much less cpus. The maxinum on i386
> f.e. is 255 meaning 8 bytes. That fits in the cacheline that is already
> used for the stack frame of the calling function.
Ughh. Wrong. 255 cpus require 32 bytes. System rarely have that
much. If you configure a kernel with less than 32 cpus then this will be
one word on the stack.
Also note that the patch restricts the search to online cpus. The
scheduler will check offline cpus without this patch. That may actually
result in speed improvements since the cachelines from offline cpus are
no longer brought in during the search for the busiest group / cpu.
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