i'm worried about a thread that uses rdtsc in user space migrating
from cpu to cpu, and getting very different values from each counter.
i looked at the intel docs that i could track down on the web, but
couldn't find an answer to this. i don't understand the kernel
code that plays with this stuff.
does linux do anything to prevent the use of the cycle counters from
being used as extremely accurate real time clocks (i'm thinking of the
idle stuff - does this in anyway stop the cycle counter from
advancing ?)
--p
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