Re: Improving the kernel/i386 timecounter performance (GSoC proposal)

Julian Elischer wrote:
David Xu wrote:
Julian Elischer wrote:
David Xu wrote:
David Xu wrote:
Julian Elischer wrote:

depends on the hardware.
anyhow I was only saying it was possible, not necessarily
good or even useful.



I had done some works for thread private page shared by kernel
and userland when I was doing userland spinlock, if userland asks
a page, kernel will allocate it and put some interesting thing in
it by scheduler etcs, these code may be useful.

FYI:
http://people.freebsd.org/~davidxu/schedctl/

reading this quickly, you allocate a separately addressed page for
each thread, but, how do you use it?


I store the address in userland TLS area, then get it when I want to
check some scheduling informations.

and the scheduler writes out interesting information to that
location?...


Yes.
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