Re: [PATCH 12/13] x86/jitalloc: prepare to allocate exectuatble memory as ROX

On Thu, Jun 01, 2023 at 08:50:39PM +0000, Edgecombe, Rick P wrote:

quoted

Ahh! Thanks for that; perhaps the comment in text_poke() about IPIs
could be a bit clearer.

What is it (if anything) you don't like about text_poke() then? It
looks
like it's doing broadly similar things to kmap_local(), so should be
in the same ballpark from a performance POV?

The way text_poke() is used here, it is creating a new writable alias
and flushing it for *each* write to the module (like for each write of
an individual relocation, etc). I was just thinking it might warrant
some batching or something.

Ah, I see. A kmap_local type interface might get us that kind of
batching, if it supported mapping compound pages - currently kmap_local
still only maps single pages, but with folios getting plumbed around I
assume someone will make it handle compound pages eventually.