Messages in this thread | | | Date | Wed, 4 Nov 2020 08:58:19 +0100 | From | Michal Hocko <> | Subject | Re: [RFC PATCH 0/2] mm: fix OOMs for binding workloads to movable zone only node |
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On Wed 04-11-20 15:38:26, Feng Tang wrote: [...] > > Could you be more specific about the usecase here? Why do you need a > > binding to a pure movable node? > > One common configuration for a platform is small size of DRAM plus huge > size of PMEM (which is slower but cheaper), and my guess of their use > is to try to lead the bulk of user space allocation (GFP_HIGHUSER_MOVABLE) > to PMEM node, and only let DRAM be used as less as possible.
While this is possible, it is a tricky configuration. It is essentially get us back to 32b and highmem...
As I've said in reply to your second patch. I think we can make the oom killer behavior more sensible in this misconfigured cases but I do not think we want break the cpuset isolation for such a configuration. -- Michal Hocko SUSE Labs
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