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Add a simple test to check the percpu memory accounting. The test creates a cgroup tree with 1000 child cgroups and checks values of memory.current and memory.stat::percpu. Signed-off-by: Roman Gushchin <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Cc: Christoph Lameter <[email protected]> Cc: David Rientjes <[email protected]> Cc: Dennis Zhou <[email protected]> Cc: Johannes Weiner <[email protected]> Cc: Joonsoo Kim <[email protected]> Cc: Mel Gorman <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Pekka Enberg <[email protected]> Cc: Shakeel Butt <[email protected]> Cc: Tejun Heo <[email protected]> Cc: Tobin C. Harding <[email protected]> Cc: Vlastimil Babka <[email protected]> Cc: Waiman Long <[email protected]> Cc: Michal Koutný <[email protected]> Cc: Bixuan Cui <[email protected]> Cc: Stephen Rothwell <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Linus Torvalds <[email protected]>