[PATCH 1/2] perf, x86-mm: Add exit-fault tracing

[Alexis Berlemont]

Signed-off-by: Alexis Berlemont <alexis.berlem...@gmail.com>
---
 arch/x86/include/asm/trace/exceptions.h | 21 +++++++++++++++++++++
 arch/x86/mm/fault.c                     |  1 +
 2 files changed, 22 insertions(+)

diff --git a/arch/x86/include/asm/trace/exceptions.h 
b/arch/x86/include/asm/trace/exceptions.h
index 2fbc66c..39f78bb 100644
--- a/arch/x86/include/asm/trace/exceptions.h
+++ b/arch/x86/include/asm/trace/exceptions.h
@@ -43,6 +43,27 @@ DEFINE_EVENT_FN(x86_exceptions, name,                        
        \
 DEFINE_PAGE_FAULT_EVENT(page_fault_user);
 DEFINE_PAGE_FAULT_EVENT(page_fault_kernel);
 
+TRACE_EVENT_FN(page_fault_exit,
+
+       TP_PROTO(unsigned long address),
+
+       TP_ARGS(address),
+
+       TP_STRUCT__entry(
+               __field(unsigned long, address)
+       ),
+
+       TP_fast_assign(
+               __entry->address = address;
+       ),
+
+       TP_printk("address=%lx", __entry->address),
+
+       trace_irq_vector_regfunc,
+
+       trace_irq_vector_unregfunc
+);
+
 #undef TRACE_INCLUDE_PATH
 #define TRACE_INCLUDE_PATH .
 #define TRACE_INCLUDE_FILE exceptions
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 9f72ca3..e31e8ef 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -1488,6 +1488,7 @@ trace_do_page_fault(struct pt_regs *regs, unsigned long 
error_code)
        prev_state = exception_enter();
        trace_page_fault_entries(address, regs, error_code);
        __do_page_fault(regs, error_code, address);
+       trace_page_fault_exit(address);
        exception_exit(prev_state);
 }
 NOKPROBE_SYMBOL(trace_do_page_fault);
-- 
2.10.1