The patch titled
Subject: mm/cma: always check which page cause allocation failure
has been added to the -mm tree. Its filename is
mm-cma-always-check-which-page-cause-allocation-failure-v2.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-cma-always-check-which-page-cause-allocation-failure-v2.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-cma-always-check-which-page-cause-allocation-failure-v2.patch
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------------------------------------------------------
From: Joonsoo Kim <js1304@xxxxxxxxx>
Subject: mm/cma: always check which page cause allocation failure
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Michal Nazarewicz <mina86@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff -puN mm/page_alloc.c~mm-cma-always-check-which-page-cause-allocation-failure-v2 mm/page_alloc.c
--- a/mm/page_alloc.c~mm-cma-always-check-which-page-cause-allocation-failure-v2
+++ a/mm/page_alloc.c
@@ -6763,6 +6763,19 @@ int alloc_contig_range(unsigned long sta
outer_start &= ~0UL << order;
}
+ if (outer_start != start) {
+ order = page_order(pfn_to_page(outer_start));
+
+ /*
+ * outer_start page could be small order buddy page and
+ * it doesn't include start page. Adjust outer_start
+ * in this case to report failed page properly
+ * on tracepoint in test_pages_isolated()
+ */
+ if (outer_start + (1UL << order) <= start)
+ outer_start = start;
+ }
+
/* Make sure the range is really isolated. */
if (test_pages_isolated(outer_start, end, false)) {
pr_info("%s: [%lx, %lx) PFNs busy\n",
_
Patches currently in -mm which might be from js1304@xxxxxxxxx are
mm-page_isolation-return-last-tested-pfn-rather-than-failure-indicator.patch
mm-page_isolation-add-new-tracepoint-test_pages_isolated.patch
mm-cma-always-check-which-page-cause-allocation-failure.patch
mm-cma-always-check-which-page-cause-allocation-failure-v2.patch
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