Re: [PATCH 00/10] perf/uprobe: Optimize uprobes

[Matthew Wilcox]

On Tue, Jul 09, 2024 at 05:10:45PM +0100, Matthew Wilcox wrote:
> > So I fundamentally do not believe in per-VMA locking. Specifically for
> > this case that would be trading one hot line for another. I tried
> > telling people that, but it doesn't seem to stick :/
> 
> SRCU also had its own performance problems, so we've got problems one
> way or the other.  The per-VMA lock probably doesn't work quite the way
> you think it does, but it absoutely can be a hot cacheline.
> 
> I did propose a store-free variant at LSFMM 2022 and again at 2023,
> but was voted down.  https://lwn.net/Articles/932298/

Actually, the 2022 version has a bit more of the flavour of the
argument: https://lwn.net/Articles/893906/