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

[Dave Hansen]

On 4/15/21 9:24 AM, Andy Lutomirski wrote:
> In the patches, *as submitted*, if you trip the XFD #NM *once* and you
> are the only thread on the system to do so, you will eat the cost of a
> WRMSR on every subsequent context switch.

I think you're saying: If a thread trips XFD #NM *once*, every switch to
and from *that* thread will incur the WRMSR cost.

The first time I read this, I thought you were saying that all threads
would incur a WRMSR cost on every context switch.  If that's the case, I
grossly misread the patches. :)