Messages in this thread | | | Date | Fri, 16 Nov 2018 10:57:20 +0100 | From | Michal Hocko <> | Subject | Re: [PATCH] mm: use managed_zone() for more exact check in zone iteration |
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On Thu 15-11-18 13:37:35, Andrew Morton wrote: [...] > Worse, the situations in which managed_zone() != populated_zone() are > rare(?), so it will take a long time for problems to be discovered, I > expect.
We would basically have to deplete the whole zone by the bootmem allocator or pull out all pages from the page allocator. E.g. memory hotplug decreases both managed and present counters. I am actually not sure that is 100% correct (put on my TODO list to check). There is no consistency in that regards.
That being said, I will review the patch (today hopefully) but fundamentally most users should indeed care about managed pages when iterating zones with memory. There should be a good reason why they might want to look at reserved pages.
-- Michal Hocko SUSE Labs
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