Messages in this thread | | | Subject | Re: dynamic-hz | From | john stultz <> | Date | Mon, 13 Dec 2004 12:56:29 -0800 |
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On Sat, 2004-12-11 at 06:23, Andrea Arcangeli wrote: > This patch is quite intrusive since many HZ visible to userspace have to > be converted to USER_HZ, and most important because HZ isn't available > at compile time anymore and every variable in function of HZ must be > either changed to be in function of USER_HZ or it must be initialized at > runtime. The code has debugging code (optional at compile time) so that > I can guarantee that there cannot be any regression.
Interesting patch, I know some folks have been asking about HZ=10k recently, so this could help.
The only bit that worries me a bit is the change from HZ->USER_HZ for internal calculations. In my mind, USER_HZ should only be used for converting internal system ticks to userspace-visible ticks. Changing drivers to think about things in user-ticks confuses things a bit since suddenly some kernel code is thinking in user-ticks and others in system-ticks. It just muddles things a bit.
thanks -john
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