Re: [PATCH 04/04] Cpuset: skip rcu check if task is in root cpuset

[Paul Jackson <pj@sgi.com>]

Paul wrote:
> But it seems like you could gain this
> benefit and more simply by disabling CONFIG_DEBUG_PREEMPT.

Yup - that would save oodles more than what we're dickering over here.

> My usual position would be to avoid putting too much effort into optimizing
> debug code, but please feel free to educate me on this one!

My position too ;).

I should quit wasting your time (and mine) with further fine tuning
of this test to skip rcu check if task->cpuset == &top_cpuset, and
instead consider removing CONFIG_DEBUG_PREEMPT from at least ia64
(sn2), if not also from the other defconfigs that have it:

    collie            simpad            s390              se7705
    lpd7a400          bigsur            dreamcast         sh03
    lpd7a404          microdev          systemh           mx1ads

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@sgi.com> 1.925.600.0401
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