On Fri, Jun 17, 2016 at 03:38:49PM +0800, Chen Feng wrote: > Hi Kim & feng, > > Thanks for the share. In our platform also has the same use case. > > We only let the alloc with GFP_HIGHUSER_MOVABLE in memory.c to use cma memory. > > If we add zone_cma, It seems can resolve the cma migrate issue. > > But when free_hot_cold_page, we need let the cma page goto system directly not the pcp. > It can be fail while cma_alloc and cma_release. If we alloc the whole cma pages which > declared before. Hmm...I'm not sure I understand your explanation. So, if I miss something, please let me know. We calls drain_all_pages() when isolating pageblock and alloc_contig_range() also has one drain_all_pages() calls to drain pcp pages. And, after pageblock isolation, freed pages belonging to MIGRATE_ISOLATE pageblock will go to the buddy directly so there would be no problem you mentioned. Isn't it? Thanks. -- 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>