Thanks Michal!! On 11/14/2023 4:18 PM, Michal Hocko wrote: >> At least in my particular stress test case it just delayed the OOM as i >> can see that at the time of OOM kill, there are no free pcp pages. My >> understanding of the OOM is that it should be the last resort and only >> after doing the enough reclaim retries. CMIW here. > Yes it is a last resort but it is a heuristic as well. So the real > questoin is whether this makes any practical difference outside of > artificial workloads. I do not see anything particularly worrying to > drain the pcp cache but it should be noted that this won't be 100% > either as racing freeing of memory will end up on pcp lists first. Okay, I don't have any practical scenario where this helped me in avoiding the OOM. Will comeback If I ever encounter this issue in practical scenario. Also If you have any comments on [PATCH V2 2/3] mm: page_alloc: correct high atomic reserve calculations will help me. Thanks.
