tracing: Add trace_dump_stack()

[net-next-2.6.git] / kernel / trace / trace.c

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 88bd9ae2a9ed9b71b881c665f7cdb4eb722cf309..f531301b7a3bee66dcd151e411c8fa986481cec3 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1151,6 +1151,22 @@ void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
        __ftrace_trace_stack(tr->buffer, flags, skip, pc);
 }
 
+/**
+ * trace_dump_stack - record a stack back trace in the trace buffer
+ */
+void trace_dump_stack(void)
+{
+       unsigned long flags;
+
+       if (tracing_disabled || tracing_selftest_running)
+               return 0;
+
+       local_save_flags(flags);
+
+       /* skipping 3 traces, seems to get us at the caller of this function */
+       __ftrace_trace_stack(global_trace.buffer, flags, 3, preempt_count());
+}
+
 void
 ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, int pc)
 {