Re: Candidate Linux ABI for Intel AMX and hypothetical new related features

[Len Brown]

On Fri, May 21, 2021 at 7:06 PM Dave Hansen <dave.hansen@xxxxxxxxx> wrote:
>
> On 5/21/21 3:07 PM, Len Brown wrote:
> > My concern about synchronous allocation is that it will be very easy
> > to abuse.  programs and threads can ask for buffers they will never
> > use.  With on-demand allocation, we allocate buffers only if they are
> > actually needed.
>
> If someone wants to abuse the on-demand allocation, they will simply
> write a single bit to an AMX register.  That does *NOT* mean they will
> actually execute an instruction that actually uses AMX to do something
> meaningful.
>
> In the face of abuse, I think the two approaches are very similar.

I didn't mean "abuse" in terms of malicious resource hogging.
I meant "abuse" in terms of unnecessarily using resources out of laziness.