On Fri 13-01-17 12:51:55, Lucas Stach wrote: > Commit 73e64c51afc5 (mm, compaction: allow compaction for GFP_NOFS requests) > changed compation to skip FS pages if not explicitly allowed to touch them, > but missed to update the CMA compact_control. > > This leads to a very high isolation failure rate, crippling performance of > CMA even on a lightly loaded system. Re-allow CMA to compact FS pages by > setting the correct GFP flags, restoring CMA behavior and performance to > the kernel 4.9 level. > > Fixes: 73e64c51afc5 (mm, compaction: allow compaction for GFP_NOFS requests) > Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx> Acked-by: Michal Hocko <mhocko@xxxxxxxx> Thanks for catching that. > --- > mm/page_alloc.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 8d5d82c8a85a..eced9fee582b 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -7255,6 +7255,7 @@ int alloc_contig_range(unsigned long start, unsigned long end, > .zone = page_zone(pfn_to_page(start)), > .mode = MIGRATE_SYNC, > .ignore_skip_hint = true, > + .gfp_mask = GFP_KERNEL, > }; > INIT_LIST_HEAD(&cc.migratepages); > > -- > 2.11.0 > -- Michal Hocko SUSE Labs -- 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>