The patch titled
Subject: mm: alloc_contig: re-allow CMA to compact FS pages
has been added to the -mm tree. Its filename is
mm-alloc_contig-re-allow-cma-to-compact-fs-pages.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-alloc_contig-re-allow-cma-to-compact-fs-pages.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-alloc_contig-re-allow-cma-to-compact-fs-pages.patch
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------------------------------------------------------
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);
_
Patches currently in -mm which might be from l.stach@xxxxxxxxxxxxxx are
mm-alloc_contig-re-allow-cma-to-compact-fs-pages.patch
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