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    SubjectRe: [PATCH 1/12] memcg avoid accounting special mappings not on LRU
    KAMEZAWA Hiroyuki wrote:
    > There are not-on-LRU pages which can be mapped and they are not worth to
    > be accounted. (becasue we can't shrink them and need dirty codes to handle
    > specical case) We'd like to make use of usual objrmap/radix-tree's protcol
    > and don't want to account out-of-vm's control pages.
    >
    > When special_mapping_fault() is called, page->mapping is tend to be NULL
    > and it's charged as Anonymous page.
    > insert_page() also handles some special pages from drivers.
    >
    > This patch is for avoiding to account special pages.
    >

    Hmm... I am a little concerned that with these changes actual usage will much
    more than what we report in memory.usage_in_bytes. Why not move them to
    non-reclaimable LRU list as unevictable pages (once those patches go in, we can
    push this as well). I suspect the size of special pages is too short to affect
    anything or are you seeing something very different?
    --
    Balbir


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