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.
