Re: [patch 05/11] syslets: core code

[Ingo Molnar]

* Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:

> > case. (but with some crazier hacks i got the one-shot atom overhead 
> > [compared to a simple synchronous null syscall] to below 10 nsecs, 
> > so there's room in there for further optimizations. Our current null 
> > syscall latency is around ~150 nsecs.)
> 
> You are not counting the whole setup cost there, then, because your 
> setup cost is going to be at a minimum more expensive than the null 
> system call.

hm, this one-time cost was never on my radar. [ It's really dwarved by 
other startup costs (a single fork() takes 100 usecs, an exec() takes 
800 usecs.) ]

In any case, we can delay this cost into the first cachemiss, or can 
eliminate it by making it a globally pooled thing. It does not seem like 
a big issue.

	Ingo
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