Messages in this thread | | | Date | Mon, 10 Feb 2003 17:06:59 -0500 (EST) | From | Bill Davidsen <> | Subject | Re: [RFC][PATCH] linux-2.5.59_getcycles_A0 |
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On Sat, 8 Feb 2003, Andi Kleen wrote:
> Regarding the watchdog: what it basically wants is a POSIX > CLOCK_MONOTONIC clock. This isn't currently implemented by Linux, > but I expect it will be eventually because it's really useful for a lot > of applications who just need an increasing time stamp in user space, > and who do not want to fight ntpd for this. One example for such > an application is the X server who needs this for its internal > event sequencing. > > Implementing it based on the current time infrastructure is very easy - > you just do not add xtime and wall jiffies in, but only jiffies. > > I don't think doing any special hacks and complicating get_cycles() > for it is the right way. Just implement a new monotonic clock primitive > (and eventually export it to user space too)
That seems to be the right way to go, rather than slow get_cycles() have a separate functionality which does what you need. Didn't know about CLOCK_MONOTONIC by that name, but I agree it's useful in various places.
-- bill davidsen <davidsen@tmr.com> CTO, TMR Associates, Inc Doing interesting things with little computers since 1979.
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