FYI, this bug has nothing to do with the use of swap. It just happens that the slow writeback incurred by using a swap device backed by non-volatile memory makes kswapd's bouts of page thrashing last longer, enough to the point where there's a visual freeze.
FYI, this bug has nothing to do with the use of swap. It just happens that the slow writeback incurred by using a swap device backed by non-volatile memory makes kswapd's bouts of page thrashing last longer, enough to the point where there's a visual freeze.