diff options
| author |   Frederic Weisbecker <fweisbec@gmail.com> | 2008-12-06 03:43:41 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2008-12-08 15:11:45 +0100 |
| commit | 380c4b1411ccd6885f92b2c8ceb08433a720f44e (patch) | |
| tree | f3b571e1caff2de3e6b4cace87c2b1ec332667d7 /include | |
| parent | tracing/function-graph-tracer: turn tracing_selftest_running into an int (diff) | |
| download | linux-dev-380c4b1411ccd6885f92b2c8ceb08433a720f44e.tar.xz linux-dev-380c4b1411ccd6885f92b2c8ceb08433a720f44e.zip | |
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.h | 13 | ||||
| -rw-r--r-- | include/linux/sched.h | 2 |
2 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index 449fa8e9e34f..11cac81eed08 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(¤t->tracing_graph_pause); +} + +static inline void unpause_graph_tracing(void) +{ + atomic_dec(¤t->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 4c152e0acc9e..4b81fc5f7731 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 */ |