Messages in this thread | | | Subject | Re: It hurts when I shoot myself in the foot | Date | Fri, 24 May 2002 17:09:39 +0100 (BST) | From | Alan Cox <> |
| |
> Couldn't that be solved in one of the following ways? > > 1) Disable pre-emption while reading TSC and CPU nr. > 2) Use affinity for processes pre-empted in kernel mode. > 3) Disable pre-emption for SMP systems.
You can solve it by disabling pre-emption (and given its questionable value doing so permanently might not be a bad idea). However if you simply disable pre-emption during udelay() calls then you've just screwed yourself by removing 99% of the use pre-emption had.
Given all the pain its probably better to not use the TSC - 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/
| |