Messages in this thread | | | Date | Tue, 17 Dec 2002 13:41:55 -0800 | From | "H. Peter Anvin" <> | Subject | Re: Intel P6 vs P7 system call performance |
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Benjamin LaHaise wrote: > On Tue, Dec 17, 2002 at 11:11:19AM -0800, H. Peter Anvin wrote: > >>>against 0xfffffxxx and "rollback" (or complete) any incomplete >>>gettimeofday call prior to saving a task's state. but i bet that test is >>>undesirable on all interrupt paths. >>> >> >>Exactly. This is a real problem. > > > No, just take the number of context switches before and after the attempt > to read the time of day. >
How do you do that from userspace, atomically? A counter in the shared page?
-hpa
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