Improving the kernel/i386
timecounter performance (GSoC proposal)
julian at elischer.org
Sat Mar 28 22:20:16 PDT 2009
David Xu wrote:
> Julian Elischer wrote:
>> Scott Long wrote:
>>> I've been talking about this for years. All I need is help with the
>>> VM magic to create the page on fork. I also want two pages, one global
>>> for gettimeofday (and any other global data we can think of) and one
>>> per-process for static data like getpid/getgid.
>> interestingly it is even feasible to have a per-thread page..
>> it requires that the scheduler change a page table entry tough.
> I will knock his door at midnight if he added such a heavy weight
> task in the scheduler, TLB shutdown is horrible, and big code size
> squeezing out data from CPU cache is not idea model.
> scheduler should be as simple as just a context switching routine.
> David Xu
depends on the hardware.
anyhow I was only saying it was possible, not necessarily
good or even useful.
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