On Mon, 28 Nov 2016, Mel Gorman wrote:

Yes, that's a problem for SLUB with or without this patch. It's always
been the case that SLUB relying on high-order pages for performance is
problematic.

This is a general issue in the kernel. Performance often requires larger
contiguous ranges of memory.

quoted

that only insiders know how to tune and an overall fragile solution.

While I agree with all of this, it's also a problem independent of this
patch.

It is related. The fundamental issue with fragmentation remain and IMHO we
really need to tackle this.

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