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authorSteven Rostedt <srostedt@redhat.com>2009-03-24 23:17:58 -0400
committerSteven Rostedt <srostedt@redhat.com>2009-03-24 23:41:11 -0400
commita2a16d6a3156ef7309ca7328a20c35df9418e670 (patch)
tree8f21d9c56eb34f9bd1057929661c96d04329dd69 /kernel/trace/trace_functions_graph.c
parentcafb168a1c92e4c9e1731fe3d666c39611762c49 (diff)
downloadop-kernel-dev-a2a16d6a3156ef7309ca7328a20c35df9418e670.zip
op-kernel-dev-a2a16d6a3156ef7309ca7328a20c35df9418e670.tar.gz
function-graph: add option to calculate graph time or not
graph time is the time that a function is executing another function. Thus if function A calls B, if graph-time is set, then the time for A includes B. This is the default behavior. But if graph-time is off, then the time spent executing B is subtracted from A. Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Diffstat (limited to 'kernel/trace/trace_functions_graph.c')
-rw-r--r--kernel/trace/trace_functions_graph.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 85bba0f..10f6ad7 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -78,13 +78,14 @@ ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth)
current->ret_stack[index].ret = ret;
current->ret_stack[index].func = func;
current->ret_stack[index].calltime = calltime;
+ current->ret_stack[index].subtime = 0;
*depth = index;
return 0;
}
/* Retrieve a function return address to the trace stack on thread info.*/
-void
+static void
ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret)
{
int index;
@@ -104,9 +105,6 @@ ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret)
trace->calltime = current->ret_stack[index].calltime;
trace->overrun = atomic_read(&current->trace_overrun);
trace->depth = index;
- barrier();
- current->curr_ret_stack--;
-
}
/*
@@ -121,6 +119,8 @@ unsigned long ftrace_return_to_handler(void)
ftrace_pop_return_trace(&trace, &ret);
trace.rettime = trace_clock_local();
ftrace_graph_return(&trace);
+ barrier();
+ current->curr_ret_stack--;
if (unlikely(!ret)) {
ftrace_graph_stop();
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