On Thu, Sep 01, 2022 at 10:34:48AM -0700, Suren Baghdasaryan wrote: > This is a proof of concept for per-vma locks idea that was discussed > during SPF [1] discussion at LSF/MM this year [2], which concluded with > suggestion that “a reader/writer semaphore could be put into the VMA > itself; that would have the effect of using the VMA as a sort of range > lock. There would still be contention at the VMA level, but it would be an > improvement.” This patchset implements this suggested approach. The whole reason I started the SPF thing waay back when was because one of the primary reporters at the time had very large VMAs and a per-vma lock wouldn't actually help anything at all. IIRC it was either scientific code initializing a huge matrix or a database with a giant table; I'm sure the archives have better memory than me.
