Messages in this thread | | | Date | Tue, 18 May 2010 02:00:52 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH] x86: Export tsc related information in sysfs |
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* Dan Magenheimer <dan.magenheimer@oracle.com> wrote:
> OK, well ignoring the metaphor, it's clear we > disagree on a point that neither one of us can > prove: You think your decision to avoid sharing > kernel information will stop system programmers > from using rdtsc, and I think some are going to use > rdtsc anyway and blame Linux when something > eventually and silently breaks.
Applications can do various unreliable things, the kernel cannot do anything about that.
The point is for the kernel to not be complicit in practices that are technically not reliable.
So the kernel wont 'signal' that something is safe to use if it is not safe to use.
One suggestion in this thread makes sense i think: to signal via sysfs that gettimeofday is slow.
Plus lets hope that we really can figure out a fast, TSC based gettimeofday implementation. If that is possible then user-space will get a fast gettimeofday right out of box.
Thanks,
Ingo
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