Re: [PATCH] x86: Export tsc related information in sysfs

From: H. Peter Anvin
Date: Tue May 18 2010 - 15:30:00 EST

On 05/18/2010 12:16 PM, Dan Magenheimer wrote:
> Oops, hit send too soon.
> And the reason I expect tglx/arjan/andi/mingo to disagree is because
> their position is that there is NO safe use for rdtsc in userspace EVER!
> Whereas your position stated earlier:
>> There are restricted uses of the TSC in userspace which are still
>> useful
>> (mainly involving performance analysis and/or CPU-locked processes).
> says there are.
> While the engineer in me agrees with tglx/arjan/andi/mingo, the
> realist in me agrees with you.

I should have added "that are not related to wall time" to the statement

Furthermore, vsyscalls are user space from a CPU perspective.


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