Hello,
(Please CC me, thank you)
Ulrich Drepper wrote:
> The attached test program fails on a dual core (and probably SMP)
> machine on x86-64. Depending on where the thread starts, in one of the
> iterations the sched_setffinity() call succeeds but then sched_getcpu()
> fails to report the correct CPU.
>
> In set_cpus_allowed migrate_task() is called if the new CPU set does not
> include the current CPU. I hope that migrate_task() also works for
> p==current.
>
> This leaves the x86-64 vgetcpu() implementation as the weak point. Is
> the caching causing problems? Should migrate_task() make sure the cache
> is reset?
>
> You need a very recent glibc to compile (glibc-2.5.90-22 in rawhide).
> If this is not available replace the sched_getcpu() call. But make sure
> you pass a pointer to a cache.
>
>
A question not related to this problem, but may I ask why the libc don't
use[1] the linux/getcpu.h header to get the opaque struct vgetcpu_cache?
Thank You
Bert Wesarg
[1]: http://sourceware.org/ml/glibc-cvs/2007-q2/msg00098.html
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