Timers and timing, was: MySQL Performance 6.0rc1

[Robert Watson]

On Fri, 28 Oct 2005, David Xu wrote:

> Poul-Henning Kamp wrote:
>
>>> On the other hand, a lower risk change might be to simply add a new 
>>> CLOCK_ type for lower resolution, and have a timer synchronize a 
>>> variable to the system clock once every 1/10 of a second.  This avoids 
>>> having to muck with VM layout, etc.
>> 
>> Is the CLOCK_* namespace ours to muck about with in the first place ?
>> 
> I prefer this way, can you implement it? The global page idea is a 
> complex, someone can slowly work on it, there are many things can be 
> done, for example, fast syscall using sysenter/sysexit.

I'm happy to take a stab at this.

We still need someone to grab the context switch time keeping by the horns 
and Do Something, though.

Robert N M Watson