Messages in this thread | | | From | Thomas Gleixner <> | Subject | Re: Candidate Linux ABI for Intel AMX and hypothetical new related features | Date | Fri, 21 May 2021 11:26:26 +0200 |
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Len,
On Thu, May 20 2021 at 17:49, Len Brown wrote: > On Thu, May 20, 2021 at 5:41 PM Thomas Gleixner <tglx@linutronix.de> wrote: >> 2) It has effects on power/thermal and therefore effects which reach >> outside of the core scope > > FWIW, this is true of *every* instruction in the CPU. > Indeed, even when the CPU is executing *no* instructions at all, > the C-state chosen by that CPU has power/thermal impacts on its peers. > > Granted, high performance instructions such as AVX-512 and TMUL > are the most extreme case.
Right and we have to draw the line somewhere.
>> 3) Your approach of making it unconditionally available via the >> proposed #NM prevents the OS and subsequently the system admin / >> system designer to implement fine grained control over that >> resource. >> >> And no, an opt-in approach by providing a non-mandatory >> preallocation prctl does not solve that problem. > > I'm perfectly fine with making the explicit allocation (aka opt-in) mandatory, > and enforcing it.
Great!
Thanks,
tglx
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