On Wed 28-08-19 18:39:22, Bharath Vedartham wrote: [...] > > Therefore I would like to shift the discussion towards existing APIs and > > whether they are suitable for such an advance auto-tuning. I haven't > > heard any arguments about missing pieces. > I understand your concern here. Just confirming, by APIs you are > referring to sysctls, sysfs files and stuff like that right? Yup > > > If memory exhaustion > > > occurs, we reclaim some more memory. kswapd stops reclaim when > > > hwmark is reached. hwmark is usually set to a fairly low percentage of > > > total memory, in my system for zone Normal hwmark is 13% of total pages. > > > So there is scope for reclaiming more pages to make sure system does not > > > suffer from a lack of pages. > > > > Yes and we have ways to control those watermarks that your monitoring > > tool can use to alter the reclaim behavior. > Just to confirm here, I am aware of one way which is to alter > min_kfree_bytes values. What other ways are there to alter watermarks > from user space? /proc/sys/vm/watermark_*factor -- Michal Hocko SUSE Labs
