Re: [patch] hrtimer: round up relative start time on low-res arches

From: Roman Zippel
Date: Wed Feb 15 2006 - 07:30:18 EST


On Wed, 15 Feb 2006, Ingo Molnar wrote:

> yeah, agreed. That will be accurately fixed via GTOD's per-hwclock
> resolution values. It will have another advantage as well: e.g. the
> whole of m68k wont be penalized via CONFIG_TIME_LOW_RES for having a
> handful of sub-arches (Apollo, Sun3x, Q40) that dont have a higher
> resolution timer - every clock can define its own resolution. You could
> help that effort by porting m68k to use GTOD ;-)

I'll do that as soon as the perfomance is equal or better than what we
have right now and expensive 64bit math in the fast path, where it's
provably a waste, is not exactly encouraging. I already provided all the
math and code to keep it cheap and (relatively) simple, but I don't have
the time to work constantly on it, so if you'd help to integrate it into
John's work it would go a lot faster.

bye, Roman
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