On Wed, Jul 29, 2015 at 11:49:45AM +0100, Mel Gorman wrote: > On Mon, Jul 13, 2015 at 05:35:15PM +0900, Gioh Kim wrote: > > My ARM-based platform occured severe fragmentation problem after long-term > > (several days) test. Sometimes even order-3 page allocation failed. It has > > memory size 512MB ~ 1024MB. 30% ~ 40% memory is consumed for graphic processing > > and 20~30 memory is reserved for zram. > > > > The primary motivation of this series is to reduce fragmentation by allowing > more kernel pages to be moved. Conceptually that is a worthwhile goal but > there should be at least one major in-kernel user and while balloon > pages were a good starting point, I think we really need to see what the > zram changes look like at the same time. I think gpu drivers really would be the perfect candidate for compacting kernel page allocations. And this also seems the primary motivation for this patch series, so I think that's really what we should use to judge these patches. Of course then there's the seemingly eternal chicken/egg problem of upstream gpu drivers for SoCs :( -Daniel -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch -- 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>