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/
