On Tue, Jul 09, 2024 at 05:30:38PM +0100, Matthew Wilcox wrote: > 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/ Thank you for the citations!
