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

[Francis Deslauriers]

Signed-off-by: Francis Deslauriers <fdeslaur at gmail.com>
Reviewed-by: Raphaël Beamonte <raphael.beamonte at polymtl.ca>
---
 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 <asm/fixmap.h>			/* VSYSCALL_START		*/
 #include <asm/context_tracking.h>	/* exception_enter(), ...	*/
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/fault.h>		/* 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