On Thu, Jun 02, 2016 at 12:07:06PM -0400, Johannes Weiner wrote: > right before the test is running? I wonder if it's mostly filled with > cache, and the increase in watermarks causes a higher portion of the > anon allocs and frees to spill to the remote node, but never enough to > enter the allocator slowpath and waking kswapd to fix it. > > Another suspect is the fair zone allocator, whose allocation batches > increased as well. It shouldn't affect NUMA placement, but I wonder if > there is a bug in there that causes false spilling to foreign nodes > that was only bounded by the allocation batch of the foreign zone. > Mel, does such a symptom sound familiar in any way? >
Unfortunately not. The closest I've seen recently is bugs in the page allocator patches that artifically enters the slow path prematurely but that does not appear to apply here. -- Mel Gorman SUSE Labs
