On Mon, Nov 07, 2016 at 03:08:49PM +0800, Chen Feng wrote: > > > On 2016/11/7 14:15, Joonsoo Kim wrote: > > On Tue, Nov 01, 2016 at 03:58:32PM +0800, Chen Feng wrote: > >> Hello, I hava a question on cma zone. > >> > >> When we have cma zone, cma zone will be the highest zone of system. > >> > >> In android system, the most memory allocator is ION. Media system will > >> alloc unmovable memory from it. > >> > >> On low memory scene, will the CMA zone always do balance? > > > > Allocation request for low zone (normal zone) would not cause CMA zone > > to be balanced since it isn't helpful. > > > Yes. But the cma zone will run out soon. And it always need to do balance. > > How about use migrate cma before movable and let cma type to fallback movable. > > https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1263745.html
ZONE_CMA approach will act like as your solution. Could you elaborate more on the problem of zone approach? Thanks.
