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ftrace: fix boot trace sched startup

Browse source 
Impact: boot tracer startup modified

The boot tracer calls into some of the schedule tracing private functions
that should not be exported. This patch cleans it up, and makes
way for further changes in the ftrace infrastructure.

This patch adds a api to assign a tracer array to the schedule
context switch tracer.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Rostedt 2008-11-07 22:36:02 -05:00 committed by Ingo Molnar
parent 0183fb1c94
commit 75f5c47da3
3 changed files with 22 additions and 4 deletions
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2
kernel/trace/trace.h
View file

@ -49,7 +49,6 @@ struct ftrace_entry {
unsigned long parent_ip;
};
extern struct tracer boot_tracer;
extern struct tracer sched_switch_trace; /* Used by the boot tracer */
/*
* Context switch trace entry - which task (and prio) we switched from/to:
@ -325,6 +324,7 @@ void trace_function(struct trace_array *tr,
void tracing_start_cmdline_record(void);
void tracing_stop_cmdline_record(void);
void tracing_cmdline_assign_trace(struct trace_array *tr);
int register_tracer(struct tracer *type);
void unregister_tracer(struct tracer *type);

9
kernel/trace/trace_boot.c
View file

@ -39,7 +39,12 @@ void disable_boot_trace(void)
static void reset_boot_trace(struct trace_array *tr)
{
sched_switch_trace.reset(tr);
int cpu;
tr->time_start = ftrace_now(tr->cpu);
for_each_online_cpu(cpu)
tracing_reset(tr, cpu);
}
static void boot_trace_init(struct trace_array *tr)
@ -50,7 +55,7 @@ static void boot_trace_init(struct trace_array *tr)
for_each_cpu_mask(cpu, cpu_possible_map)
tracing_reset(tr, cpu);
sched_switch_trace.init(tr);
tracing_cmdline_assign_trace(tr);
}
static void boot_trace_ctrl_update(struct trace_array *tr)

15
kernel/trace/trace_sched_switch.c
View file

@ -152,6 +152,19 @@ void tracing_stop_cmdline_record(void)
tracing_stop_sched_switch();
}
/**
* tracing_cmdline_assign_trace - assign a trace array for ctx switch
* @tr: trace array pointer to assign
*
* Some tracers might want to record the context switches in their
* trace. This function lets those tracers assign the trace array
* to use.
*/
void tracing_cmdline_assign_trace(struct trace_array *tr)
{
ctx_trace = tr;
}
static void start_sched_trace(struct trace_array *tr)
{
sched_switch_reset(tr);
@ -197,7 +210,7 @@ static void sched_switch_trace_stop(struct trace_array *tr)
tracing_stop_sched_switch();
}
struct tracer sched_switch_trace __read_mostly =
static struct tracer sched_switch_trace __read_mostly =
{
.name = "sched_switch",
.init = sched_switch_trace_init,