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From 424f6c4818bbf1b8ccf58aa012ecc19c0bb9b446 Mon Sep 17 00:00:00 2001
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From: Lucas Stach <l.stach@pengutronix.de>
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Date: Tue, 24 Jan 2017 15:18:05 -0800
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Subject: [PATCH 179/273] mm: alloc_contig: re-allow CMA to compact FS pages
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Commit 73e64c51afc5 ("mm, compaction: allow compaction for GFP_NOFS
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requests") changed compation to skip FS pages if not explicitly allowed
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to touch them, but missed to update the CMA compact_control.
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This leads to a very high isolation failure rate, crippling performance
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of CMA even on a lightly loaded system. Re-allow CMA to compact FS
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pages by setting the correct GFP flags, restoring CMA behavior and
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performance to the kernel 4.9 level.
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Fixes: 73e64c51afc5 (mm, compaction: allow compaction for GFP_NOFS requests)
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Link: http://lkml.kernel.org/r/20170113115155.24335-1-l.stach@pengutronix.de
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Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
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Acked-by: Michal Hocko <mhocko@suse.com>
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Acked-by: Vlastimil Babka <vbabka@suse.cz>
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Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
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Cc: Mel Gorman <mgorman@techsingularity.net>
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Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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---
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mm/page_alloc.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/mm/page_alloc.c b/mm/page_alloc.c
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index d604d25..41d5e2e 100644
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--- a/mm/page_alloc.c
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+++ b/mm/page_alloc.c
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@@ -7248,6 +7248,7 @@ int alloc_contig_range(unsigned long start, unsigned long end,
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.zone = page_zone(pfn_to_page(start)),
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.mode = MIGRATE_SYNC,
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.ignore_skip_hint = true,
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+ .gfp_mask = GFP_KERNEL,
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};
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INIT_LIST_HEAD(&cc.migratepages);
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--
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2.9.3
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