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SubjectRe: [PATCH] sched: reorder root_domain to remove 64 bit alignment padding
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On Fri, 2011-07-15 at 12:44 +0200, Peter Zijlstra wrote:
> On Fri, 2011-07-15 at 11:41 +0100, Richard Kennedy wrote:
> > Reorder root_domain to remove 8 bytes of alignment padding on 64 bit
> > builds, this shrinks the size from 1736 to 1728 bytes, therefore using
> > one fewer cachelines.
>
> depends a bit on how insane struct cpupri is, but yeah, good compaction.
> Thanks!

Thanks Peter,

argh -- I hadn't spotted that cpupri used NR_CPUS and was so variable in
size. I guess there won't be much benefit then, as the distros seem to
always set NR_CPUS to some insanely huge value ;)

regards
Richard




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