From: Lucas Stach <l.stach@xxxxxxxxxxxxxx> Subject: mm: alloc_contig: re-allow CMA to compact FS pages 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) Link: http://lkml.kernel.org/r/20170113115155.24335-1-l.stach@xxxxxxxxxxxxxx Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx> Acked-by: Michal Hocko <mhocko@xxxxxxxx> Acked-by: Vlastimil Babka <vbabka@xxxxxxx> Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/page_alloc.c | 1 + 1 file changed, 1 insertion(+) diff -puN mm/page_alloc.c~mm-alloc_contig-re-allow-cma-to-compact-fs-pages mm/page_alloc.c --- a/mm/page_alloc.c~mm-alloc_contig-re-allow-cma-to-compact-fs-pages +++ a/mm/page_alloc.c @@ -7248,6 +7248,7 @@ int alloc_contig_range(unsigned long sta .zone = page_zone(pfn_to_page(start)), .mode = MIGRATE_SYNC, .ignore_skip_hint = true, + .gfp_mask = GFP_KERNEL, }; INIT_LIST_HEAD(&cc.migratepages); _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
