On Tue, Feb 23, 2016 at 03:04:24PM +0000, Mel Gorman wrote:

ac->classzone_idx is determined by the index of the preferred zone and cached
to avoid repeated calculations. wake_all_kswapds() should use it instead of
using zone_idx() within a loop.

Signed-off-by: Mel Gorman <redacted>

Acked-by: Johannes Weiner <hannes@cmpxchg.org>

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