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    SubjectRe: [PATCH 11/31] mm: vmscan: do not reclaim from kswapd if there is any eligible zone
    On Thu, Jul 07, 2016 at 03:27:01PM +0900, Minchan Kim wrote:
    > > I'm not going to go with it for now because buffer_heads_over_limit is not
    > > necessarily a problem unless lowmem is factor. We don't want background
    > > reclaim to go ahead unnecessarily just because buffer_heads_over_limit.
    > > It could be distinguished by only forcing reclaim to go ahead on systems
    > > with highmem.
    >
    > If you don't think it's a problem, I don't want to insist on it because I don't
    > have any report/workload right now. Instead, please write some comment in there
    > for others to understand why kswapd is okay to ignore buffer_heads_over_limit
    > unlike direct reclaim. Such non-symmetric behavior is really hard to follow
    > without any description.

    Ok, I'll add a patch later in the series that addresses the issue.
    Currently it's called "mm, vmscan: Have kswapd reclaim from all zones if
    reclaiming and buffer_heads_over_limit".

    --
    Mel Gorman
    SUSE Labs

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