Re: [PATCH] Use uname not sysctl to get the kernel revision

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 location

Except 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.

	-hpa
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• References:
  • Re: [PATCH] Use uname not sysctl to get the kernel revision
    • From: Roland McGrath <[email protected]>
  • Re: [PATCH] Use uname not sysctl to get the kernel revision
    • From: Ulrich Drepper <[email protected]>
  • Re: [PATCH] Use uname not sysctl to get the kernel revision
    • From: Jakub Jelinek <[email protected]>
  • Re: [PATCH] Use uname not sysctl to get the kernel revision
    • From: "H. Peter Anvin" <[email protected]>
  • Re: [PATCH] Use uname not sysctl to get the kernel revision
    • From: [email protected] (Eric W. Biederman)
  • Re: [PATCH] Use uname not sysctl to get the kernel revision
    • From: Arjan van de Ven <[email protected]>
  • Re: [PATCH] Use uname not sysctl to get the kernel revision
    • From: [email protected] (Eric W. Biederman)
  • Re: [PATCH] Use uname not sysctl to get the kernel revision
    • From: Arjan van de Ven <[email protected]>
  • Re: [PATCH] Use uname not sysctl to get the kernel revision
    • From: "H. Peter Anvin" <[email protected]>
  • Re: [PATCH] Use uname not sysctl to get the kernel revision
    • From: [email protected] (Eric W. Biederman)
  • Re: [PATCH] Use uname not sysctl to get the kernel revision
    • From: Alan Cox <[email protected]>
  • Re: [PATCH] Use uname not sysctl to get the kernel revision
    • From: Benjamin Herrenschmidt <[email protected]>

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