On 01/23/2011 05:58 PM, David Rientjes wrote:
0e093d99763e (writeback: do not sleep on the congestion queue if there are no congested BDIs or if significant congestion is not being encountered in the current zone) uncovered a livelock in the page allocator that resulted in tasks infinitely looping trying to find memory and kswapd running at 100% cpu. The issue occurs because drain_all_pages() is called immediately following direct reclaim when no memory is freed and try_to_free_pages() returns non-zero because all zones in the zonelist do not have their all_unreclaimable flag set.
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