On Sun, Feb 11, 2024 at 5:58 AM Chengming Zhou <zhouchengming@xxxxxxxxxxxxx> wrote: > > All zswap entries will take a reference of zswap_pool when > zswap_store(), and drop it when free. Change it to use the > percpu_ref is better for scalability performance. > > Testing kernel build in tmpfs with memory.max=2GB > (zswap shrinker and writeback enabled with one 50GB swapfile). > > mm-unstable zswap-global-lru > real 63.20 63.12 > user 1061.75 1062.95 > sys 268.74 264.44 Are these numbers from a single run or the average of multiple runs? It just seems that the improvement is small, and percpu refcnt is slightly less intuitive (and uses a bit more memory), so let's make sure there is a real performance gain first. It would also be useful to mention how many threads/CPUs are being used here.
