Re: scheduler times/upcalls

Larry McVoy (lm@bitmover.com)
Wed, 30 Sep 1998 01:30:41 -0600

: > if you had a light weight way to get out to user space when an event occurs
: > you could do some rally cool things - it could well amount to you having
: > the speed of kernel code and the ease of use of user code.
:
: Do I take it then that you'd be a fan of having upcalls implemented
: under Linux ?

I'd sure like to see what you had in mind, yes. Absolutely. There is a
benchmark for how good they have to be, however: it has to be possible to
upcall into a process faster than context switching into the process and
having it downcall to get the data.

Anyway, yes, I'm interested. I think most people don't know what upcalls
are so maybe you could start with a description? I tried and botched it.

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