On Mon, 8 Mar 2010 11:48:20 +0000 Mel Gorman <mel@xxxxxxxxx> wrote: > Under memory pressure, the page allocator and kswapd can go to sleep using > congestion_wait(). In two of these cases, it may not be the appropriate > action as congestion may not be the problem. clear_bdi_congested() is called each time a write completes and the queue is below the congestion threshold. So if the page allocator or kswapd call congestion_wait() against a non-congested queue, they'll wake up on the very next write completion. Hence the above-quoted claim seems to me to be a significant mis-analysis and perhaps explains why the patchset didn't seem to help anything? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>