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authorJoonsoo Kim <js1304@gmail.com>2016-01-15 02:18:42 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-15 03:00:49 +0300
commit0f0848e5118a4cb2cb92cef0c3af6f647649ff47 (patch)
tree0300cded0b507d813a3133cb80944c047997d1fe /include/trace
parentfea85cff11de4377040deff0e85eb2793fb078aa (diff)
downloadlinux-0f0848e5118a4cb2cb92cef0c3af6f647649ff47.tar.xz
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 'include/trace')
-rw-r--r--include/trace/events/page_isolation.h38
1 files changed, 38 insertions, 0 deletions
diff --git a/include/trace/events/page_isolation.h b/include/trace/events/page_isolation.h
new file mode 100644
index 000000000000..6fb644029c80
--- /dev/null
+++ b/include/trace/events/page_isolation.h
@@ -0,0 +1,38 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM page_isolation
+
+#if !defined(_TRACE_PAGE_ISOLATION_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_PAGE_ISOLATION_H
+
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(test_pages_isolated,
+
+ TP_PROTO(
+ unsigned long start_pfn,
+ unsigned long end_pfn,
+ unsigned long fin_pfn),
+
+ TP_ARGS(start_pfn, end_pfn, fin_pfn),
+
+ TP_STRUCT__entry(
+ __field(unsigned long, start_pfn)
+ __field(unsigned long, end_pfn)
+ __field(unsigned long, fin_pfn)
+ ),
+
+ TP_fast_assign(
+ __entry->start_pfn = start_pfn;
+ __entry->end_pfn = end_pfn;
+ __entry->fin_pfn = fin_pfn;
+ ),
+
+ TP_printk("start_pfn=0x%lx end_pfn=0x%lx fin_pfn=0x%lx ret=%s",
+ __entry->start_pfn, __entry->end_pfn, __entry->fin_pfn,
+ __entry->end_pfn == __entry->fin_pfn ? "success" : "fail")
+);
+
+#endif /* _TRACE_PAGE_ISOLATION_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>