On Mon, Oct 09, 2017 at 10:34:25AM +0100, Alex Bennée wrote: > > Dave Martin <Dave.Martin@xxxxxxx> writes: > > > On Fri, Oct 06, 2017 at 04:43:43PM +0100, Szabolcs Nagy wrote: > >> On 31/08/17 18:00, Dave Martin wrote: > >> > +9. System runtime configuration > >> > +-------------------------------- > >> > + > >> > +* To mitigate the ABI impact of expansion of the signal frame, a policy > >> > + mechanism is provided for administrators, distro maintainers and developers > >> > + to set the default vector length for userspace processes: > >> > + > >> > +/proc/cpu/sve_default_vector_length > >> > >> > >> elsewhere in the patch series i see > >> > >> /proc/sys/abi/sve_default_vector_length > >> > >> is this supposed to be the same? > > > > Good spot, thanks! > > > > /proc/cpu/ was the old location: they should both say /proc/abi/. > > I'll fix it. > > Isn't /sys (or rather sysfs) the preferred location for modern control > knobs that mirror the kernels object model or is SVE a special case for > extending /proc? I couldn't figure out which kernel object this maps to. There's no device, no driver. This isn't even per-cpu. sysctl is already used for similar knobs to this one, so I followed that precedent -- though if someone argues strongly enough it could be changed. Are there already examples of arch controls like this in sysfs? I wasn't aware of any, but I didn't look all that hard... Cheers ---Dave _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
