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authorJoonsoo Kim <js1304@gmail.com>2016-01-14 15:18:42 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-14 16:00:49 -0800
commit0f0848e5118a4cb2cb92cef0c3af6f647649ff47 (patch)
tree0300cded0b507d813a3133cb80944c047997d1fe /mm/page_isolation.c
parentfea85cff11de4377040deff0e85eb2793fb078aa (diff)
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mm/page_isolation.c: add new tracepoint, test_pages_isolated
cma allocation should be guranteeded to succeed. But sometimes it can fail in the current implementation. To track down the problem, we need to know which page is problematic and this new tracepoint will report it. Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Acked-by: Michal Nazarewicz <mina86@mina86.com> Acked-by: David Rientjes <rientjes@google.com> Cc: Minchan Kim <minchan@kernel.org> Acked-by: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_isolation.c')
-rw-r--r--mm/page_isolation.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index 029a171d35dc..f484b9300fe3 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -9,6 +9,9 @@
#include <linux/hugetlb.h>
#include "internal.h"
+#define CREATE_TRACE_POINTS
+#include <trace/events/page_isolation.h>
+
static int set_migratetype_isolate(struct page *page,
bool skip_hwpoisoned_pages)
{
@@ -268,6 +271,8 @@ int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
skip_hwpoisoned_pages);
spin_unlock_irqrestore(&zone->lock, flags);
+ trace_test_pages_isolated(start_pfn, end_pfn, pfn);
+
return pfn < end_pfn ? -EBUSY : 0;
}