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    SubjectRe: [PATCH 12/12] vmscan: Do not writeback pages in direct reclaim
    On 06/15/2010 08:17 PM, KAMEZAWA Hiroyuki wrote:
    > On Tue, 15 Jun 2010 15:16:01 +0100
    > Mel Gorman<mel@csn.ul.ie> wrote:

    >> But in turn, where is mem_cgroup_hierarchical_reclaim called from direct
    >> reclaim? It appears to be only called from the fault path or as a result
    >> of the memcg changing size.
    >>
    > yes. It's only called from
    > - page fault
    > - add_to_page_cache()
    >
    > I think we'll see no stack problem. Now, memcg doesn't wakeup kswapd for
    > reclaiming memory, it needs direct writeback.

    Of course, a memcg page fault could still be triggered
    from copy_to_user or copy_from_user, with a fairly
    arbitrary stack frame above...

    --
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