[parisc-linux] sched_clock implementation
Matthew Wilcox
willy@debian.org
Thu, 18 Sep 2003 21:35:10 +0100
Anyone want to do better than the lame implementation? ;-)
----- Forwarded message from Andrew Morton <akpm@osdl.org> -----
I'll be merging Ingo & Con's CPOU scheduler changes into Linus's tree soon.
It does require that the architecture provides a new timing function:
A lame implementation is:
/*
* Returns nanoseconds
*/
unsigned long long sched_clock(void)
{
return (unsigned long long)jiffies * (1000000000 / HZ);
}
But for best CPU scheduler results the architecture should try to return a
higher-resolution number than this of course.
sched_clock() has no absolute time requirements: it just has to return some
number which goes up by 1,000,000,000 times per second.
I already have implementations for x86, ppc, sparc64 and ia64.
I have a completely stupid ppc64 implementation which is only accurate on
1GHz CPUs. Anton please note!
As for the rest, it'll break the build, sorry.
----- End forwarded message -----
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