On 09/27/23 14:47, Johannes Weiner wrote: > On Wed, Sep 27, 2023 at 01:21:20PM +0200, Michal Hocko wrote: > > On Tue 26-09-23 12:49:47, Nhat Pham wrote: > > So that if you use 80% hugetlb, the other memory is forced to stay in > the remaining 20%, or it OOMs; and that if you don't use hugetlb, the > group is still allowed to use the full 100% of its host memory > allowance, without requiring some outside agent continuously > monitoring and adjusting the container limits. Jumping in late here as I was traveling last week. In addition, I want to state my limited cgroup knowledge up front. I was thinking of your scenario above a little differently. Suppose a group is up and running at almost 100% memory usage. However, the majority of that memory is reclaimable. Now, someone wants to allocate a 2M hugetlb page. There is not 2MB free, but we could easily reclaim 2MB to make room for the hugetlb page. I may be missing something, but I do not see how that is going to happen. It seems like we would really want that behavior. -- Mike Kravetz
