[lttng-dev] [RFC-Patch 1/2] Add page fault trace event definitions

[Francis Deslauriers]

Add page_fault_entry and page_fault_exit event definitions. It will
allow each architecture to instrument their page faults.

Signed-off-by: Francis Deslauriers <fdeslaur at gmail.com>
Reviewed-by: Raphaël Beamonte <raphael.beamonte at gmail.com>
---
 include/trace/events/fault.h |   51 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 include/trace/events/fault.h

diff --git a/include/trace/events/fault.h b/include/trace/events/fault.h
new file mode 100644
index 0000000..522ddee
--- /dev/null
+++ b/include/trace/events/fault.h
@@ -0,0 +1,51 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM fault
+
+#if !defined(_TRACE_FAULT_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_FAULT_H
+
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(page_fault_entry,
+
+	TP_PROTO(struct pt_regs *regs, unsigned long address,
+					int write_access),
+
+	TP_ARGS(regs, address, write_access),
+
+	TP_STRUCT__entry(
+		__field(	unsigned long,	ip	)
+		__field(	unsigned long,	addr	)
+		__field(	uint8_t,	write	)
+	),
+
+	TP_fast_assign(
+		__entry->ip	= regs ? instruction_pointer(regs) : 0UL;
+		__entry->addr	= address;
+		__entry->write	= !!write_access;
+	),
+
+	TP_printk("ip=%lu addr=%lu write_access=%d",
+		__entry->ip, __entry->addr, __entry->write)
+);
+
+TRACE_EVENT(page_fault_exit,
+
+	TP_PROTO(int result),
+
+	TP_ARGS(result),
+
+	TP_STRUCT__entry(
+		__field(	int,	res	)
+	),
+
+	TP_fast_assign(
+		__entry->res	= result;
+	),
+
+	TP_printk("result=%d", __entry->res)
+);
+
+#endif /* _TRACE_FAULT_H */
+/* This part must be outside protection */
+#include <trace/define_trace.h>
-- 
1.7.10.4