Re: dynamic-hz

linux-os
2004-12-15T20:00:03Z

On Wed, 15 Dec 2004, Alan Cox wrote:

> On Maw, 2004-12-14 at 00:16, Eric St-Laurent wrote:
>> Alan,
>>
>> On a related subject, a few months ago you posted a patch which added a
>> nice add_timeout()/timeout_pending() API and converted many (if not
>> most) drivers to use it.
>>
>> If I remember correctly it did not generate much comments and the work
>> was not pushed into mainline.
>>
>> I think it's a nice cleanup, IMHO the time_(before|after)(jiffies, ...)
>> construct is horrible.
>>
>> Any chance to resurrect this work ?
>
> I plan to ressurect it when I have a little time but with some small
> additions from the original work. Several people said "it should be mS
> not HZ" and someone at OLS proposed that the API also includes an
> accuracy guide so that systems using programmed wakeups can aggregate
> timers when accuracy doesn't matter.

I sure hope it isn't mS. Transconductance or its reciprocal doesn't
work very well for timing unless you supply the capacitor ;^)

FYI, mS means milli-Siemens. Seconds is lower-case --always.

Cheers,
Dick Johnson
Penguin : Linux version 2.6.9 on an i686 machine (5537.79 BogoMips).
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