2013/12/4 Mel Gorman <mgorman@xxxxxxx>: > On Tue, Dec 03, 2013 at 06:30:28PM -0800, Florian Fainelli wrote: >> Hi all, >> >> I am experiencing high kswapd CPU usage on an ARMv7 system running >> 3.8.13 when executing relatively large binaries from NFS. When this >> happens kswapd consumes around 55-60% CPU usage and the applications >> takes a huge time to load. >> > > There were a number of changes made related to how and when kswapd > stalls, particularly when pages are dirty. Brief check confirms that > > git log v3.8..v3.12 --pretty=one --author "Mel Gorman" mm/vmscan.c > > NFS dirty pages are problematic for compaction as dirty pages cannot be > migrated until cleaned. I'd suggest checking if current mainline suffers > the same problem and if not, focus on patches related to dirty page > handling and kswapd throttling in mm/vmscan.c as backport candidates. I have just backported these patches to 3.8.13 and am still seeing the problem, although kswapd usage dropped considerably (by half approximately). Will keep you updated once I have properly tested current mainline on my platform. Thanks! -- Florian -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>