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authorFrederic Weisbecker <fweisbec@gmail.com>2008-12-06 03:43:41 +0100
committerIngo Molnar <mingo@elte.hu>2008-12-08 15:11:45 +0100
commit380c4b1411ccd6885f92b2c8ceb08433a720f44e (patch)
treef3b571e1caff2de3e6b4cace87c2b1ec332667d7 /include
parent8e1b82e0866befaa0b2920be296c6e4c3fc7f422 (diff)
tracing/function-graph-tracer: append the tracing_graph_flag
Impact: Provide a way to pause the function graph tracer As suggested by Steven Rostedt, the previous patch that prevented from spinlock function tracing shouldn't use the raw_spinlock to fix it. It's much better to follow lockdep with normal spinlock, so this patch adds a new flag for each task to make the function graph tracer able to be paused. We also can send an ftrace_printk whithout worrying of the irrelevant traced spinlock during insertion. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include')
-rw-r--r--include/linux/ftrace.h13
-rw-r--r--include/linux/sched.h2
2 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 449fa8e9e34..11cac81eed0 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -401,6 +401,16 @@ static inline int task_curr_ret_stack(struct task_struct *t)
{
return t->curr_ret_stack;
}
+
+static inline void pause_graph_tracing(void)
+{
+ atomic_inc(&current->tracing_graph_pause);
+}
+
+static inline void unpause_graph_tracing(void)
+{
+ atomic_dec(&current->tracing_graph_pause);
+}
#else
#define __notrace_funcgraph
@@ -412,6 +422,9 @@ static inline int task_curr_ret_stack(struct task_struct *tsk)
{
return -1;
}
+
+static inline void pause_graph_tracing(void) { }
+static inline void unpause_graph_tracing(void) { }
#endif
#ifdef CONFIG_TRACING
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 4c152e0acc9..4b81fc5f773 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1379,6 +1379,8 @@ struct task_struct {
* because of depth overrun.
*/
atomic_t trace_overrun;
+ /* Pause for the tracing */
+ atomic_t tracing_graph_pause;
#endif
#ifdef CONFIG_TRACING
/* state flags for use by tracers */