Messages in this thread | | | Date | Thu, 31 May 2001 15:43:34 -0700 (PDT) | From | "H. Peter Anvin" <> | Subject | Re: How to know HZ from userspace? |
| |
On Fri, 1 Jun 2001, Peter Waltenberg wrote:
> Yes, I know we have a chance of being rescheduled simply because "something > else" has also yielded. However thats fairly hit and miss. > > I don't disagree with your statement that thats how the interface should be > designed, but the most of the apps that could use it still have an unreliable > interface. i.e. you ask to be woken in 2.54mS, on X86 it'll likely be ~10mS, > on Alpha ~3mS. Now and then you'll get woken somewhere near the time you > requested. >
First of all, the unit of time is the second (s), not the siemens (S).
Second, I think we're talking about different things. I'm talking about interfaces (/proc, ioctl, etc.) in which durations are specified in jiffies. This is unacceptable.
What you seem to be talking about is user-space insight into the scheduling algorithm, which is another matter.
-hpa
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |