Re: [PATCH v2 1/6] x86/bugs: Add asm helpers for executing VERW

Peter Zijlstra
2023-10-24T22:31:52Z

On Tue, Oct 24, 2023 at 06:49:07PM +0000, Luck, Tony wrote:
> > the only overhead to modules other than load time (including the runtime linking) is that modules can't realistically be mapped using large page entries.
>
> If there were some significant win for using large pages, couldn't the

There is. The 4k TLBs really hurt. Thomas and me ran into that when
doing the retbleed call depth crud. Similarly Song ran into it with BPF,
they really want eBPF JIT to write to large pages.