[PATCH] AArch64: Check kernel version for SVE ifuncs

Florian Weimer fweimer@redhat.com
Thu Mar 14 09:02:09 GMT 2024


* Adhemerval Zanella Netto:

> Yes, I understand this. My point it won't be possible to backport this 
> kernel fix to get the performance improvement of SVE routines without 
> hacking the glibc as well.  It is not really a blocker, but I would
> expect kernel to do proper advertise for such performance change that
> might interfere with ifunc selection. Maybe we can add a tunable to
> force SVE selection, but I don't have a strong opinion.

I think the kernel change went into the other direction: it eliminated
the SVE trap after system calls.

Thanks,
Florian



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