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SubjectRe: [PATCH v3 -mm 1/3] mm: reclaim at order 0 when compaction is enabled
On Thu, Jan 26, 2012 at 02:59:14PM -0500, Rik van Riel wrote:
> When built with CONFIG_COMPACTION, kswapd should not try to free
> contiguous pages, because it is not trying hard enough to have
> a real chance at being successful, but still disrupts the LRU
> enough to break other things.
> Do not do higher order page isolation unless we really are in
> lumpy reclaim mode.
> Stop reclaiming pages once we have enough free pages that
> compaction can deal with things, and we hit the normal order 0
> watermarks used by kswapd.
> Also remove a line of code that increments balanced right before
> exiting the function.
> Signed-off-by: Rik van Riel <>

Acked-by: Mel Gorman <>

Mel Gorman

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