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 >> Should we transmit the highest available zone to kswapd？ > > It is already done when necessary. > > Thanks. > > > . >
