On Wed, Feb 23, 2022 at 1:28 AM Huang, Ying <ying.huang@xxxxxxxxx> wrote: > > Hi, Yu, > > Yu Zhao <yuzhao@xxxxxxxxxx> writes: > > > To avoid confusions, the terms "promotion" and "demotion" will be > > applied to the multigenerational LRU, as a new convention; the terms > > "activation" and "deactivation" will be applied to the active/inactive > > LRU, as usual. > > In the memory tiering related commits and patchset, for example as follows, > > commit 668e4147d8850df32ca41e28f52c146025ca45c6 > Author: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx> > Date: Thu Sep 2 14:59:19 2021 -0700 > > mm/vmscan: add page demotion counter > > https://lore.kernel.org/linux-mm/20220221084529.1052339-1-ying.huang@xxxxxxxxx/ > > "demote" and "promote" is used for migrating pages between different > types of memory. Is it better for us to avoid overloading these words > too much to avoid the possible confusion? Given that LRU and migration are usually different contexts, I think we'd be fine, unless we want a third pair of terms. > > +static int get_swappiness(struct mem_cgroup *memcg) > > +{ > > + return mem_cgroup_get_nr_swap_pages(memcg) >= MIN_LRU_BATCH ? > > + mem_cgroup_swappiness(memcg) : 0; > > +} > > After we introduced demotion support in Linux kernel. The anonymous > pages in the fast memory node could be demoted to the slow memory node > via the page reclaiming mechanism as in the following commit. Can you > consider that too? Sure. How do I check whether there is still space on the slow node?
