Re: Illegal use of reserved word in system.h

[Helge Hafting]

Ben Greear wrote:

> Arjan van de Ven wrote:
>
> > HZ may not exist. At all; people are trying to remove it. And userspace
> > has no business knowing about it either.
>
>
> It can be helpful to know what HZ you are running at, for instance if 
> you care
> very much about the (average) precision of a select/poll timeout.
Will  knowing it help?  You may find out that you don't have much precision,
but then theres nothing to do about it.  And there may not even be a HZ,
as mentioned.  Less cpu is used if there is no periodic interrupts when
there is nothing to do.  People are trying to *not* have a regular timer
interrupt; instead, a one-shot timer can be programmed for the next
necessary timeout which may very well be quite a few "ticks" into
the future. In this case there is no notion of HZ at all.

Helge Hafting


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