Messages in this thread | | | Date | Thu, 7 May 2009 18:09:09 +0100 | From | Alan Cox <> | Subject | Re: [PATCH] x86: Reduce the default HZ value |
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On Thu, 07 May 2009 12:55:05 -0400 Jeff Garzik <jeff@garzik.org> wrote:
> H. Peter Anvin wrote: > > Alan Cox wrote: > >> Hooray - finally someone admits the *real* problem here, and for power > >> management too. Otherwise known as "referencing jiffies as a variable must > >> die" > > > > Amen. Also, "using HZ as a unit of measurement must die, too." > > Love to -- now, what will it be replaced with? > > grep for 'deadline' in drivers/ata/libata* to find an example not so > easily converted away from jiffies.
I don't see any.
I do see a complicated interface that appears to actually really want to implement
add_timer(&foo->expiry_timer);
and checks against the timer completing. In fact it looks as if all the stuff in there is really down to
add a timer check if it expired check how long until it expires delete it
And you might as well measure that in HZ=1000's better known as "milliseconds"
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