[lttng-dev] [RFC-Patch 2/2] x86:Instruments page fault trace event

[Francis Deslauriers]

Signed-off-by: Francis Deslauriers 
Reviewed-by: Raphaël Beamonte 
---
 arch/x86/mm/fault.c |5 +
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 2b97525..f41a5a0 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -20,6 +20,9 @@
 #include /* VSYSCALL_START   
*/
 #include   /* exception_enter(), ...   */
 
+#define CREATE_TRACE_POINTS
+#include /* trace_page_fault_*(), ...
*/
+
 /*
  * Page fault error code bits:
  *
@@ -1183,7 +1186,9 @@ good_area:
 * make sure we exit gracefully rather than endlessly redo
 * the fault:
 */
+   trace_page_fault_entry(regs, address, write);
fault = handle_mm_fault(mm, vma, address, flags);
+   trace_page_fault_exit(fault);
 
if (unlikely(fault & (VM_FAULT_RETRY|VM_FAULT_ERROR))) {
if (mm_fault_error(regs, error_code, address, fault))
-- 
1.7.10.4


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[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 
Reviewed-by: Raphaël Beamonte 
---
 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 000..7256b40
--- /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 
+
+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(int,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 
-- 
1.7.10.4


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