Thanks David for the review comments!! On 2/18/2021 11:46 PM, David Hildenbrand wrote: >> I would like to start discussion about balancing the occupancy of >> memory zones in a node in the system whose imabalance may be caused by >> migration of pages to other zones during hotremove and then hotadding >> same memory. In this case there is a lot of free memory in newly hotadd >> memory which can be filled up by the previous migrated pages(as part of >> offline/hotremove) thus may free up some pressure in other zones of the >> node. > > Why is this specific to memory hot(un)plug? I think the problem is more > generic: > > Assume > > 1. Application 1 allocates a lot of memory and gets ZONE_MOVABLE. > 2. Application 2 allocates a lot of memory and gets ZONE_NORMAL. > 3. Application 1 quits. > > Same problem, no? Thanks for simplifying this problem. Yeah, this looks more generic problem. But for these type of problems, user/system administrator has clear view about the state of the system and thus may need to take some decisions to maintain the the node zones balancing e.g. like this change where migrate the eligible pages to other zones. -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
