On Thu, 2017-05-04 at 14:52 +0200, Michal Hocko wrote: > But the direct reclaim would be effective only _after_ all other nodes > are full. > > I thought that kswapd reclaim is a problem because the HW doesn't > support aging properly but as the direct reclaim works then what is the > actual problem? Ageing isn't isn't completely broken. The ATS MMU supports dirty/accessed just fine. However the TLB invalidations are quite expensive with a GPU so too much harvesting is detrimental, and the GPU tends to check pages out using a special "read with intend to write" mode, which means it almost always set the dirty bit if the page is writable to begin with. Cheers, Ben. -- 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>
