Messages in this thread | | | Date | Wed, 27 Aug 2003 09:01:33 -0700 | From | William Lee Irwin III <> | Subject | Re: [PATCH] 2.6.0-test4 -- add context switch counters |
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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.
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