Messages in this thread | | | Subject | Re: [PATCH] Use uname not sysctl to get the kernel revision | From | Arjan van de Ven <> | Date | Wed, 12 Jul 2006 23:29:26 +0200 |
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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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