From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: [for-next][PATCH 15/25] tracing: Do not create function tracer options when not compiled in
Date: Thu, 01 Oct 2015 07:55:39 -0400 [thread overview]
Message-ID: <20151001115638.586772817@goodmis.org> (raw)
In-Reply-To: 20151001115524.066462793@goodmis.org
[-- Attachment #1: 0015-tracing-Do-not-create-function-tracer-options-when-n.patch --]
[-- Type: text/plain, Size: 8211 bytes --]
From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>
When the function tracer is not compiled in, do not create the option files
for it.
Fix up both the sched_wakeup and irqsoff tracers to handle the change.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
kernel/trace/trace.c | 4 ++--
kernel/trace/trace.h | 11 +++++++++-
kernel/trace/trace_irqsoff.c | 28 +++++++++++++++++++++-----
kernel/trace/trace_sched_wakeup.c | 42 ++++++++++++++++++++++++++-------------
4 files changed, 63 insertions(+), 22 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 68fcb40fc764..cb223ad51cdf 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -490,11 +490,11 @@ static inline void ftrace_trace_stack(struct ring_buffer *buffer,
/* trace_flags holds trace_options default values */
unsigned long trace_flags =
- FUNCTION_GRAPH_DEFAULT_FLAGS |
+ FUNCTION_DEFAULT_FLAGS | FUNCTION_GRAPH_DEFAULT_FLAGS |
TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |
TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO |
TRACE_ITER_RECORD_CMD | TRACE_ITER_OVERWRITE |
- TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS | TRACE_ITER_FUNCTION
+ TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS
;
static void tracer_tracing_on(struct trace_array *tr)
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 3f1cc45b7007..b389d409b952 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -902,6 +902,15 @@ extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
# define BRANCH_FLAGS
#endif
+#ifdef CONFIG_FUNCTION_TRACER
+# define FUNCTION_FLAGS \
+ C(FUNCTION, "function-trace"),
+# define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION
+#else
+# define FUNCTION_FLAGS
+# define FUNCTION_DEFAULT_FLAGS 0UL
+#endif
+
/*
* trace_iterator_flags is an enumeration that defines bit
* positions into trace_flags that controls the output.
@@ -931,7 +940,7 @@ extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
C(STOP_ON_FREE, "disable_on_free"), \
C(IRQ_INFO, "irq-info"), \
C(MARKERS, "markers"), \
- C(FUNCTION, "function-trace"), \
+ FUNCTION_FLAGS \
FGRAPH_FLAGS \
BRANCH_FLAGS
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index bd9cd0e2c13c..c834b95cbe0b 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -31,7 +31,6 @@ enum {
static int trace_type __read_mostly;
static int save_flags;
-static bool function_enabled;
static void stop_irqsoff_tracer(struct trace_array *tr, int graph);
static int start_irqsoff_tracer(struct trace_array *tr, int graph);
@@ -249,21 +248,23 @@ __trace_function(struct trace_array *tr,
#else
#define __trace_function trace_function
+#ifdef CONFIG_FUNCTION_TRACER
static int irqsoff_graph_entry(struct ftrace_graph_ent *trace)
{
return -1;
}
+#endif
static enum print_line_t irqsoff_print_line(struct trace_iterator *iter)
{
return TRACE_TYPE_UNHANDLED;
}
-static void irqsoff_graph_return(struct ftrace_graph_ret *trace) { }
static void irqsoff_trace_open(struct trace_iterator *iter) { }
static void irqsoff_trace_close(struct trace_iterator *iter) { }
#ifdef CONFIG_FUNCTION_TRACER
+static void irqsoff_graph_return(struct ftrace_graph_ret *trace) { }
static void irqsoff_print_header(struct seq_file *s)
{
trace_default_header(s);
@@ -507,6 +508,9 @@ void trace_preempt_off(unsigned long a0, unsigned long a1)
}
#endif /* CONFIG_PREEMPT_TRACER */
+#ifdef CONFIG_FUNCTION_TRACER
+static bool function_enabled;
+
static int register_irqsoff_function(struct trace_array *tr, int graph, int set)
{
int ret;
@@ -540,21 +544,35 @@ static void unregister_irqsoff_function(struct trace_array *tr, int graph)
function_enabled = false;
}
-static int irqsoff_function_set(struct trace_array *tr, int set)
+static int irqsoff_function_set(struct trace_array *tr, u32 mask, int set)
{
+ if (!(mask & TRACE_ITER_FUNCTION))
+ return 0;
+
if (set)
register_irqsoff_function(tr, is_graph(), 1);
else
unregister_irqsoff_function(tr, is_graph());
+ return 1;
+}
+#else
+static int register_irqsoff_function(struct trace_array *tr, int graph, int set)
+{
return 0;
}
+static void unregister_irqsoff_function(struct trace_array *tr, int graph) { }
+static inline int irqsoff_function_set(struct trace_array *tr, u32 mask, int set)
+{
+ return 0;
+}
+#endif /* CONFIG_FUNCTION_TRACER */
static int irqsoff_flag_changed(struct trace_array *tr, u32 mask, int set)
{
struct tracer *tracer = tr->current_trace;
- if (mask & TRACE_ITER_FUNCTION)
- return irqsoff_function_set(tr, set);
+ if (irqsoff_function_set(tr, mask, set))
+ return 0;
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
if (mask & TRACE_ITER_DISPLAY_GRAPH)
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index a6c350c681cc..4a20f61274d1 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -34,11 +34,8 @@ static arch_spinlock_t wakeup_lock =
static void wakeup_reset(struct trace_array *tr);
static void __wakeup_reset(struct trace_array *tr);
-static int wakeup_graph_entry(struct ftrace_graph_ent *trace);
-static void wakeup_graph_return(struct ftrace_graph_ret *trace);
static int save_flags;
-static bool function_enabled;
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
static int wakeup_display_graph(struct trace_array *tr, int set);
@@ -46,7 +43,7 @@ static int wakeup_display_graph(struct trace_array *tr, int set);
#else
static inline int wakeup_display_graph(struct trace_array *tr, int set)
{
- return -EINVAL;
+ return 0;
}
# define is_graph() false
#endif
@@ -54,6 +51,11 @@ static inline int wakeup_display_graph(struct trace_array *tr, int set)
#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;
+
/*
* Prologue for the wakeup function tracers.
*
@@ -123,7 +125,6 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip,
atomic_dec(&data->disabled);
preempt_enable_notrace();
}
-#endif /* CONFIG_FUNCTION_TRACER */
static int register_wakeup_function(struct trace_array *tr, int graph, int set)
{
@@ -158,21 +159,35 @@ static void unregister_wakeup_function(struct trace_array *tr, int graph)
function_enabled = false;
}
-static int wakeup_function_set(struct trace_array *tr, int set)
+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(), 1);
else
unregister_wakeup_function(tr, is_graph());
+ 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 (mask & TRACE_ITER_FUNCTION)
- return wakeup_function_set(tr, set);
+ if (wakeup_function_set(tr, mask, set))
+ return 0;
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
if (mask & TRACE_ITER_DISPLAY_GRAPH)
@@ -302,21 +317,20 @@ __trace_function(struct trace_array *tr,
#else
#define __trace_function trace_function
-static int wakeup_graph_entry(struct ftrace_graph_ent *trace)
-{
- return -1;
-}
-
static enum print_line_t wakeup_print_line(struct trace_iterator *iter)
{
return TRACE_TYPE_UNHANDLED;
}
-static void wakeup_graph_return(struct ftrace_graph_ret *trace) { }
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);
--
2.5.1
next prev parent reply other threads:[~2015-10-01 12:01 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-01 11:55 [for-next][PATCH 00/25] tracing: Have instances have their own options + clean ups Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 01/25] kernel/trace_probe: is_good_name can be boolean Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 02/25] tracing: Move non perf code out of perf.h Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 03/25] tracing: Remove ftrace_trace_stack_regs() Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 04/25] tracing: Remove unused function trace_current_buffer_lock_reserve() Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 05/25] tracing: Pass trace_array into trace_buffer_unlock_commit() Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 06/25] tracing: Make ftrace_trace_stack() static Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 07/25] tracing: Inject seq_print_userip_objs() into its only user Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 08/25] tracing: Turn seq_print_user_ip() into a static function Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 09/25] tracing: Move "display-graph" option to main options Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 10/25] tracing: Remove unused tracing option "ftrace_preempt" Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 11/25] tracing: Use enums instead of hard coded bitmasks for TRACE_ITER flags Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 12/25] tracing: Use TRACE_FLAGS macro to keep enums and strings matched Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 13/25] tracing: Only create function graph options when it is compiled in Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 14/25] tracing: Only create branch tracer options when " Steven Rostedt
2015-10-01 11:55 ` Steven Rostedt [this message]
2015-10-01 11:55 ` [for-next][PATCH 16/25] tracing: Only create stacktrace option when STACKTRACE is configured Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 17/25] tracing: Always show all tracer options in the options directory Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 18/25] tracing: Add build bug if we have more trace_flags than bits Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 19/25] tracing: Remove access to trace_flags in trace_printk.c Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 20/25] tracing: Move sleep-time and graph-time options out of the core trace_flags Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 21/25] tracing: Move trace_flags from global to a trace_array field Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 22/25] tracing: Add a method to pass in trace_array descriptor to option files Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 23/25] tracing: Make ftrace_trace_stack() depend on general trace_array flag Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 24/25] tracing: Add trace options for core options to instances Steven Rostedt
2015-10-01 11:55 ` [for-next][PATCH 25/25] tracing: Add trace options for tracer " Steven Rostedt
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