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    SubjectRe: [PATCH] mm: use managed_zone() for more exact check in zone iteration
    On Fri 16-11-18 12:05:04, osalvador wrote:
    > On Fri, 2018-11-16 at 10:57 +0100, Michal Hocko wrote:
    [...]
    > > 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.
    >
    > We can only offline non-reserved pages (so, managed pages).

    Yes

    > Since present pages holds reserved_pages + managed_pages, decreasing
    > both should be fine unless I am mistaken.

    Well, present_pages is defined as "physical pages existing within the zone"
    and those pages are still existing but they are offline. But as I've
    said I have to think about it some more
    --
    Michal Hocko
    SUSE Labs

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