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    SubjectRe: [PATCH] Use uname not sysctl to get the kernel revision
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    On Wed, 2006-07-12 at 15:23 -0600, Eric W. Biederman wrote:
    > "H. Peter Anvin" <hpa@zytor.com> writes:
    >
    > > Jakub Jelinek wrote:
    > >> On Wed, Jul 12, 2006 at 12:33:56PM -0700, Ulrich Drepper wrote:
    > >>> Roland McGrath wrote:
    > >>>> We could also put the uname info (modulo nodename) into the vDSO.
    > >>> Or even better: real topology information.
    > >> AND rather than OR would be even better. So glibc could find kernel
    > >> version, etc. and topology in the vDSO cheaply.
    > >
    > > Wouldn't it make more sense for this to be in ELF tags, rather than the vdso?
    > > Another alternative, I guess, would be to put a pointer in the ELF tags, which
    > > may point into the vdso.
    >
    > Cheap and simple access to topology information would be interesting.
    >
    > Glibc just wants to know if our kernel is SMP so it can know if it is
    > ok to busy wait for a bit waiting for a mutex. Or if busy waiting is
    > a complete loss.


    with current power management... busy waiting pretty much is a loss even
    on UP

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