[PATCH v2] tracing/sysprof: add missing tracing_{start,stop}_record_cmdline()

[Frederic Weisbecker]

Add the missing pair tracing_{start,stop}_record_cmdline() to record well
the cmdline associated with pid.

Changes in v2:

_ fix a build error, the sched_switch tracer is needed to record the
cmdline.

Reported-by: Ingo Molnar <mingo@xxxxxxx>
Acked-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
---
 kernel/trace/Kconfig         |    1 +
 kernel/trace/trace_sysprof.c |    3 +++
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 79be773..620f9cd 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -134,6 +134,7 @@ config SYSPROF_TRACER
 	bool "Sysprof Tracer"
 	depends on X86
 	select TRACING
+	select CONTEXT_SWITCH_TRACER
 	help
 	  This tracer provides the trace needed by the 'Sysprof' userspace
 	  tool.
diff --git a/kernel/trace/trace_sysprof.c b/kernel/trace/trace_sysprof.c
index 84ca9d8..9902c15 100644
--- a/kernel/trace/trace_sysprof.c
+++ b/kernel/trace/trace_sysprof.c
@@ -238,6 +238,8 @@ static int stack_trace_init(struct trace_array *tr)
 {
 	sysprof_trace = tr;
 
+	tracing_start_cmdline_record();
+
 	mutex_lock(&sample_timer_lock);
 	start_stack_timers();
 	tracer_enabled = 1;
@@ -247,6 +249,7 @@ static int stack_trace_init(struct trace_array *tr)
 
 static void stack_trace_reset(struct trace_array *tr)
 {
+	tracing_stop_cmdline_record();
 	stop_stack_trace(tr);
 }
 
-- 
1.6.1



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