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Message-Id: <20181205234829.854565087@goodmis.org>
Date: Wed, 05 Dec 2018 18:47:59 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org
Cc: Ingo Molnar <mingo@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Namhyung Kim <namhyung@...nel.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Tom Zanussi <zanussi@...nel.org>,
Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Subject: [for-next][PATCH 10/30] tracing: Rearrange functions in trace_sched_wakeup.c
From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>
Rearrange the functions in trace_sched_wakeup.c so that there are fewer
#ifdef CONFIG_FUNCTION_TRACER and #ifdef CONFIG_FUNCTION_GRAPH_TRACER,
instead of having the #ifdefs spread all over.
No functional change is made.
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
kernel/trace/trace_sched_wakeup.c | 272 ++++++++++++++----------------
1 file changed, 130 insertions(+), 142 deletions(-)
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index 7d04b9890755..2ce78100b4d3 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -35,26 +35,19 @@ static arch_spinlock_t wakeup_lock =
static void wakeup_reset(struct trace_array *tr);
static void __wakeup_reset(struct trace_array *tr);
+static int start_func_tracer(struct trace_array *tr, int graph);
+static void stop_func_tracer(struct trace_array *tr, int graph);
static int save_flags;
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
-static int wakeup_display_graph(struct trace_array *tr, int set);
# define is_graph(tr) ((tr)->trace_flags & TRACE_ITER_DISPLAY_GRAPH)
#else
-static inline int wakeup_display_graph(struct trace_array *tr, int set)
-{
- return 0;
-}
# define is_graph(tr) false
#endif
-
#ifdef CONFIG_FUNCTION_TRACER
-static int wakeup_graph_entry(struct ftrace_graph_ent *trace);
-static void wakeup_graph_return(struct ftrace_graph_ret *trace);
-
static bool function_enabled;
/*
@@ -104,122 +97,8 @@ func_prolog_preempt_disable(struct trace_array *tr,
return 0;
}
-/*
- * wakeup uses its own tracer function to keep the overhead down:
- */
-static void
-wakeup_tracer_call(unsigned long ip, unsigned long parent_ip,
- struct ftrace_ops *op, struct pt_regs *pt_regs)
-{
- struct trace_array *tr = wakeup_trace;
- struct trace_array_cpu *data;
- unsigned long flags;
- int pc;
-
- if (!func_prolog_preempt_disable(tr, &data, &pc))
- return;
-
- local_irq_save(flags);
- trace_function(tr, ip, parent_ip, flags, pc);
- local_irq_restore(flags);
-
- atomic_dec(&data->disabled);
- preempt_enable_notrace();
-}
-
-static int register_wakeup_function(struct trace_array *tr, int graph, int set)
-{
- int ret;
-
- /* 'set' is set if TRACE_ITER_FUNCTION is about to be set */
- if (function_enabled || (!set && !(tr->trace_flags & TRACE_ITER_FUNCTION)))
- return 0;
-
- if (graph)
- ret = register_ftrace_graph(&wakeup_graph_return,
- &wakeup_graph_entry);
- else
- ret = register_ftrace_function(tr->ops);
-
- if (!ret)
- function_enabled = true;
-
- return ret;
-}
-
-static void unregister_wakeup_function(struct trace_array *tr, int graph)
-{
- if (!function_enabled)
- return;
-
- if (graph)
- unregister_ftrace_graph();
- else
- unregister_ftrace_function(tr->ops);
-
- function_enabled = false;
-}
-
-static int wakeup_function_set(struct trace_array *tr, u32 mask, int set)
-{
- if (!(mask & TRACE_ITER_FUNCTION))
- return 0;
-
- if (set)
- register_wakeup_function(tr, is_graph(tr), 1);
- else
- unregister_wakeup_function(tr, is_graph(tr));
- return 1;
-}
-#else
-static int register_wakeup_function(struct trace_array *tr, int graph, int set)
-{
- return 0;
-}
-static void unregister_wakeup_function(struct trace_array *tr, int graph) { }
-static int wakeup_function_set(struct trace_array *tr, u32 mask, int set)
-{
- return 0;
-}
-#endif /* CONFIG_FUNCTION_TRACER */
-
-static int wakeup_flag_changed(struct trace_array *tr, u32 mask, int set)
-{
- struct tracer *tracer = tr->current_trace;
-
- if (wakeup_function_set(tr, mask, set))
- return 0;
-
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
- if (mask & TRACE_ITER_DISPLAY_GRAPH)
- return wakeup_display_graph(tr, set);
-#endif
-
- return trace_keep_overwrite(tracer, mask, set);
-}
-static int start_func_tracer(struct trace_array *tr, int graph)
-{
- int ret;
-
- ret = register_wakeup_function(tr, graph, 0);
-
- if (!ret && tracing_is_enabled())
- tracer_enabled = 1;
- else
- tracer_enabled = 0;
-
- return ret;
-}
-
-static void stop_func_tracer(struct trace_array *tr, int graph)
-{
- tracer_enabled = 0;
-
- unregister_wakeup_function(tr, graph);
-}
-
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
static int wakeup_display_graph(struct trace_array *tr, int set)
{
if (!(is_graph(tr) ^ set))
@@ -318,20 +197,94 @@ static void wakeup_print_header(struct seq_file *s)
else
trace_default_header(s);
}
+#else /* CONFIG_FUNCTION_GRAPH_TRACER */
+static int wakeup_graph_entry(struct ftrace_graph_ent *trace)
+{
+ return -1;
+}
+static void wakeup_graph_return(struct ftrace_graph_ret *trace) { }
+#endif /* else CONFIG_FUNCTION_GRAPH_TRACER */
+/*
+ * wakeup uses its own tracer function to keep the overhead down:
+ */
static void
-__trace_function(struct trace_array *tr,
- unsigned long ip, unsigned long parent_ip,
- unsigned long flags, int pc)
+wakeup_tracer_call(unsigned long ip, unsigned long parent_ip,
+ struct ftrace_ops *op, struct pt_regs *pt_regs)
{
- if (is_graph(tr))
- trace_graph_function(tr, ip, parent_ip, flags, pc);
+ struct trace_array *tr = wakeup_trace;
+ struct trace_array_cpu *data;
+ unsigned long flags;
+ int pc;
+
+ if (!func_prolog_preempt_disable(tr, &data, &pc))
+ return;
+
+ local_irq_save(flags);
+ trace_function(tr, ip, parent_ip, flags, pc);
+ local_irq_restore(flags);
+
+ atomic_dec(&data->disabled);
+ preempt_enable_notrace();
+}
+
+static int register_wakeup_function(struct trace_array *tr, int graph, int set)
+{
+ int ret;
+
+ /* 'set' is set if TRACE_ITER_FUNCTION is about to be set */
+ if (function_enabled || (!set && !(tr->trace_flags & TRACE_ITER_FUNCTION)))
+ return 0;
+
+ if (graph)
+ ret = register_ftrace_graph(&wakeup_graph_return,
+ &wakeup_graph_entry);
else
- trace_function(tr, ip, parent_ip, flags, pc);
+ ret = register_ftrace_function(tr->ops);
+
+ if (!ret)
+ function_enabled = true;
+
+ return ret;
}
-#else
-#define __trace_function trace_function
+static void unregister_wakeup_function(struct trace_array *tr, int graph)
+{
+ if (!function_enabled)
+ return;
+
+ if (graph)
+ unregister_ftrace_graph();
+ else
+ unregister_ftrace_function(tr->ops);
+
+ function_enabled = false;
+}
+
+static int wakeup_function_set(struct trace_array *tr, u32 mask, int set)
+{
+ if (!(mask & TRACE_ITER_FUNCTION))
+ return 0;
+
+ if (set)
+ register_wakeup_function(tr, is_graph(tr), 1);
+ else
+ unregister_wakeup_function(tr, is_graph(tr));
+ return 1;
+}
+#else /* CONFIG_FUNCTION_TRACER */
+static int register_wakeup_function(struct trace_array *tr, int graph, int set)
+{
+ return 0;
+}
+static void unregister_wakeup_function(struct trace_array *tr, int graph) { }
+static int wakeup_function_set(struct trace_array *tr, u32 mask, int set)
+{
+ return 0;
+}
+#endif /* else CONFIG_FUNCTION_TRACER */
+
+#ifndef CONFIG_FUNCTION_GRAPH_TRACER
static enum print_line_t wakeup_print_line(struct trace_iterator *iter)
{
return TRACE_TYPE_UNHANDLED;
@@ -340,23 +293,58 @@ static enum print_line_t wakeup_print_line(struct trace_iterator *iter)
static void wakeup_trace_open(struct trace_iterator *iter) { }
static void wakeup_trace_close(struct trace_iterator *iter) { }
-#ifdef CONFIG_FUNCTION_TRACER
-static int wakeup_graph_entry(struct ftrace_graph_ent *trace)
-{
- return -1;
-}
-static void wakeup_graph_return(struct ftrace_graph_ret *trace) { }
static void wakeup_print_header(struct seq_file *s)
{
trace_default_header(s);
}
-#else
-static void wakeup_print_header(struct seq_file *s)
+#endif /* !CONFIG_FUNCTION_GRAPH_TRACER */
+
+static void
+__trace_function(struct trace_array *tr,
+ unsigned long ip, unsigned long parent_ip,
+ unsigned long flags, int pc)
+{
+ if (is_graph(tr))
+ trace_graph_function(tr, ip, parent_ip, flags, pc);
+ else
+ trace_function(tr, ip, parent_ip, flags, pc);
+}
+
+static int wakeup_flag_changed(struct trace_array *tr, u32 mask, int set)
{
- trace_latency_header(s);
+ struct tracer *tracer = tr->current_trace;
+
+ if (wakeup_function_set(tr, mask, set))
+ return 0;
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ if (mask & TRACE_ITER_DISPLAY_GRAPH)
+ return wakeup_display_graph(tr, set);
+#endif
+
+ return trace_keep_overwrite(tracer, mask, set);
+}
+
+static int start_func_tracer(struct trace_array *tr, int graph)
+{
+ int ret;
+
+ ret = register_wakeup_function(tr, graph, 0);
+
+ if (!ret && tracing_is_enabled())
+ tracer_enabled = 1;
+ else
+ tracer_enabled = 0;
+
+ return ret;
+}
+
+static void stop_func_tracer(struct trace_array *tr, int graph)
+{
+ tracer_enabled = 0;
+
+ unregister_wakeup_function(tr, graph);
}
-#endif /* CONFIG_FUNCTION_TRACER */
-#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
/*
* Should this new latency be reported/recorded?
--
2.19.1
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