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    SubjectRe: [PATCH] 2.6.0-test4 -- add context switch counters
    On Wed, Aug 27, 2003 at 08:52:46AM -0700, Larry McVoy wrote:
    > I normally hate ifdefs but this might be a good place to use a bunch of
    > macros and make them conditional on config_stats or something. Updating
    > counters is going to add to the size of the data cache footprint and it
    > would be nice, for those people working on embedded low speed processors,
    > if they could config this out. I personally would leave it in, I like
    > this stats. I just know that the path to slowness is paved one cache
    > miss at a time.

    I've profiled this and know the memory stats don't do any harm; the
    rest I'd have to see profiled. AFAICT all the damage is done after
    ticking mm->rss in the various pagetable copying/blitting operations,
    and once we've taken that hit (in mainline!) the other counters are
    noise-level. The integral counters are another story; I've not seen
    those in action.

    -- wli
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