Re: [PATCH v17 02/16] preempt: Track NMI nesting to separate per-CPU counter

[Peter Zijlstra]

On Thu, Feb 05, 2026 at 08:24:40PM -0500, Joel Fernandes wrote:

> > I guess Peter was trying to say it's not a slow path if you consider
> > perf event interrupts on x86? [1]
> 
> How are we handling this performance issue then on 32-bit x86 architecture with
> perf? Or are we saying we don't care about performance on 32-bit?

Yeah, in general I don't consider any 32bit architecture performance
critical at this point. Its pure legacy code, to be removed at some
point.

To x86_32 in particular, we make it limp along. It sorta builds and
sorta boots but meh. It doesn't even have most of the speculation fixes.
You really, as in *REALLY* should not be running a x86_32 kernel.

I mean, if you still want to run Linux on your museum grade Pentium-II
processor, don't let me stop you. Just don't expect miracles.