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Fix CMA compaction regression (Raspberry Pi and others)

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Peter Robinson 2017-01-31 16:40:57 +00:00
parent 753b803d17
commit 44d72048f4
2 changed files with 47 additions and 0 deletions
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5
kernel.spec
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@ -529,6 +529,8 @@ Patch432: bcm283x-fixes.patch
# http://www.spinics.net/lists/linux-mmc/msg41151.html
Patch433: bcm283x-mmc-imp-speed.patch
Patch434: mm-alloc_contig-re-allow-CMA-to-compact-FS-pages.patch
Patch440: AllWinner-net-emac.patch
Patch442: ARM-Drop-fixed-200-Hz-timer-requirement-from-Samsung-platforms.patch
@ -2184,6 +2186,9 @@ fi
#
#
%changelog
* Tue Jan 31 2017 Peter Robinson <pbrobinson@fedoraproject.org>
- Fix CMA compaction regression (Raspberry Pi and others)
* Thu Jan 26 2017 Peter Robinson <pbrobinson@fedoraproject.org>
- arm64: dma-mapping: Fix dma_mapping_error() when bypassing SWIOTLB

42
mm-alloc_contig-re-allow-CMA-to-compact-FS-pages.patch Normal file
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@ -0,0 +1,42 @@
From 424f6c4818bbf1b8ccf58aa012ecc19c0bb9b446 Mon Sep 17 00:00:00 2001
From: Lucas Stach <l.stach@pengutronix.de>
Date: Tue, 24 Jan 2017 15:18:05 -0800
Subject: [PATCH 179/273] 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@pengutronix.de
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
mm/page_alloc.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d604d25..41d5e2e 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -7248,6 +7248,7 @@ 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);
--
2.9.3