Messages in this thread | | | Date | Sun, 28 Jul 2002 18:36:58 -0300 (BRT) | From | Rik van Riel <> | Subject | Re: inlines in kernel/sched.c |
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On Sun, 28 Jul 2002, Ingo Molnar wrote: > On Sun, 28 Jul 2002, Andrew Morton wrote: > > > Ingo, could you please review the use of inlines in the > > scheduler sometime? They seem to be excessive. > > > > For example, this patch reduces the sched.d icache footprint > > by 1.5 kilobytes. > > the patch also hurts context-switch latencies - it went > from 1.35 usecs to 1.42 usecs - a 5% drop.
That's 140 cpu cycles on a 2 GHz CPU, probably less time than what a single cache miss would cost for non-scheduler-intensive workloads.
This would mean that for a workload which is doing real work, and pushes the scheduler out of the L1 cache, the slowdown would be a lot more simply due to the extra cache misses the extra inlines generate.
regards,
Rik -- Bravely reimplemented by the knights who say "NIH".
http://www.surriel.com/ http://distro.conectiva.com/
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