context_tracking: User/kernel broundary cross trace events

This can be useful to track all kernel/user round trips.
And it's also helpful to debug the context tracking subsystem.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Kevin Hilman <khilman@linaro.org>

diff --git a/include/trace/events/context_tracking.h b/include/trace/events/context_tracking.h
new file mode 100644 (file)
index 0000000..ce8007c
--- /dev/null
+++ b/include/trace/events/context_tracking.h
@@ -0,0 +1,58 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM context_tracking
+
+#if !defined(_TRACE_CONTEXT_TRACKING_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_CONTEXT_TRACKING_H
+
+#include <linux/tracepoint.h>
+
+DECLARE_EVENT_CLASS(context_tracking_user,
+
+       TP_PROTO(int dummy),
+
+       TP_ARGS(dummy),
+
+       TP_STRUCT__entry(
+               __field( int,   dummy   )
+       ),
+
+       TP_fast_assign(
+               __entry->dummy          = dummy;
+       ),
+
+       TP_printk("%s", "")
+);
+
+/**
+ * user_enter - called when the kernel resumes to userspace
+ * @dummy:     dummy arg to make trace event macro happy
+ *
+ * This event occurs when the kernel resumes to userspace  after
+ * an exception or a syscall.
+ */
+DEFINE_EVENT(context_tracking_user, user_enter,
+
+       TP_PROTO(int dummy),
+
+       TP_ARGS(dummy)
+);
+
+/**
+ * user_exit - called when userspace enters the kernel
+ * @dummy:     dummy arg to make trace event macro happy
+ *
+ * This event occurs when userspace enters the kernel through
+ * an exception or a syscall.
+ */
+DEFINE_EVENT(context_tracking_user, user_exit,
+
+       TP_PROTO(int dummy),
+
+       TP_ARGS(dummy)
+);
+
+
+#endif /*  _TRACE_CONTEXT_TRACKING_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>

diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
index c178226..247091b 100644 (file)
--- a/kernel/context_tracking.c
+++ b/kernel/context_tracking.c
@@ -20,6 +20,9 @@
 #include <linux/hardirq.h>
 #include <linux/export.h>
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/context_tracking.h>
+
 struct static_key context_tracking_enabled = STATIC_KEY_INIT_FALSE;
 EXPORT_SYMBOL_GPL(context_tracking_enabled);
 
@@ -64,6 +67,7 @@ void context_tracking_user_enter(void)
        local_irq_save(flags);
        if ( __this_cpu_read(context_tracking.state) != IN_USER) {
                if (__this_cpu_read(context_tracking.active)) {
+                       trace_user_enter(0);
                        /*
                         * At this stage, only low level arch entry code remains and
                         * then we'll run in userspace. We can assume there won't be
@@ -159,6 +163,7 @@ void context_tracking_user_exit(void)
                         */
                        rcu_user_exit();
                        vtime_user_exit(current);
+                       trace_user_exit(0);
                }
                __this_cpu_write(context_tracking.state, IN_KERNEL);
        }