Eric W. Biederman wrote:
"H. Peter Anvin" <[email protected]> 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.
The practical challenge is that topology information is not fixed but
potentially varies at runtime.
Ulrich what would be interesting besides the possibility of having
multiple cpus?
Something that might make sense to ask CPU vendors for in the future: an
instruction that can either trap or be a noop (or better, cpu_relax)
based on a control register.
Not that that solves any problem any time soon.
-hpa
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