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

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Date:   Wed, 26 Oct 2016 01:51:59 +0200
From:   Alexis Berlemont <alexis.berlemont@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Alexis Berlemont <alexis.berlemont@...il.com>,
        peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com
Subject: [PATCH 1/2] perf, x86-mm: Add exit-fault tracing

Signed-off-by: Alexis Berlemont <alexis.berlemont@...il.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