Benjamin Herrenschmidt wrote:
If you want to do the job right then do this - Stick an indicator of how much else wants to run on this CPU in the vsyscall page or similar locationExcept that "this cpu" doesn't really mean anything in userspace, and while I think Andi has some tricks to get some sort of CPU number to userspace (though it's really only valid during the execution of the instruction that reads it :) I haven't yet found an equivalent for powerpc (and possibly other architectures will have the same problem).
Sure it does... although its validity in terms of a locality metric decays with time.
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