On Sat, May 1, 2021 at 8:39 PM Yu Zhao <yuzhao@xxxxxxxxxx> wrote: > > On Sat, May 1, 2021 at 8:31 PM Alexandre Frade <kernel@xxxxxxxxxx> wrote: > > > > Dear Yu Zhao, > > > > I don't know if it's a known issue with the 5.12 kernel released [9f4ad9e]: > > > > LRU_GEN v2 & v5.12 final: > > Hi Alexandre, > > I think I hit this problem with Ubuntu too. Does your config include > the following? > CONFIG_MAXSMP=y > CONFIG_NODES_SHIFT=10 > CONFIG_NR_CPUS=8192 > If so, then it's the same problem: there are no spare bits left in > page->flags. Disabling > CONFIG_MAXSMP should fix it, unless you really want to use 8192 CPUs > and 1024 NUMA nodes :) > > Please let me know. Thanks! Sorry I forgot to clarify that this option should be disabled regardless whether you want to use the multigenerational lru or not. This option is for debugging and will bring unnecessary memory overhead to production systems.
