On 02/22/2011 11:04 AM, Mel Gorman wrote:

To avoid an excessive number of pages being reclaimed from the larger zones,
explicitely defines the "balance gap" to be either 1% of the zone or the
low watermark for the zone, whichever is smaller.  While kswapd will check
all zones to apply pressure, it'll ignore zones that meets the (high_wmark +
balance_gap) watermark.

To test this, 80G were copied from a partition and the amount of memory
being used was recorded. A comparison of a patch and unpatched kernel
can be seen at
http://www.csn.ul.ie/~mel/postings/minfree-20110222/memory-usage-hydra.ps
and shows that kswapd is not reclaiming as much memory with the patch
applied.

Signed-off-by: Andrea Arcangeli<redacted>
Signed-off-by: Mel Gorman<redacted>

Acked-by: Rik van Riel <redacted>

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