mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 03:10:12 +00:00
![Dmitry Safonov](/assets/img/avatar_default.png)
There is no reason to do it twice: from commit b6f11df26f
("trace: Call tracing_reset_online_cpus before tracer->init()")
resetting of per-CPU buffers done before tracer->init() call.
tracer->init() calls {irqs,preempt,preemptirqs}off_tracer_init() and it
calls __irqsoff_tracer_init(), which resets per-CPU ringbuffer second
time.
It's slowpath, but anyway.
Link: http://lkml.kernel.org/r/1445278226-16187-1-git-send-email-0x7f454c46@gmail.com
Signed-off-by: Dmitry Safonov <0x7f454c46@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
771 lines
18 KiB
C
771 lines
18 KiB
C
/*
|
|
* trace irqs off critical timings
|
|
*
|
|
* Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>
|
|
* Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>
|
|
*
|
|
* From code in the latency_tracer, that is:
|
|
*
|
|
* Copyright (C) 2004-2006 Ingo Molnar
|
|
* Copyright (C) 2004 Nadia Yvette Chambers
|
|
*/
|
|
#include <linux/kallsyms.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/module.h>
|
|
#include <linux/ftrace.h>
|
|
|
|
#include "trace.h"
|
|
|
|
static struct trace_array *irqsoff_trace __read_mostly;
|
|
static int tracer_enabled __read_mostly;
|
|
|
|
static DEFINE_PER_CPU(int, tracing_cpu);
|
|
|
|
static DEFINE_RAW_SPINLOCK(max_trace_lock);
|
|
|
|
enum {
|
|
TRACER_IRQS_OFF = (1 << 1),
|
|
TRACER_PREEMPT_OFF = (1 << 2),
|
|
};
|
|
|
|
static int trace_type __read_mostly;
|
|
|
|
static int save_flags;
|
|
|
|
static void stop_irqsoff_tracer(struct trace_array *tr, int graph);
|
|
static int start_irqsoff_tracer(struct trace_array *tr, int graph);
|
|
|
|
#ifdef CONFIG_PREEMPT_TRACER
|
|
static inline int
|
|
preempt_trace(void)
|
|
{
|
|
return ((trace_type & TRACER_PREEMPT_OFF) && preempt_count());
|
|
}
|
|
#else
|
|
# define preempt_trace() (0)
|
|
#endif
|
|
|
|
#ifdef CONFIG_IRQSOFF_TRACER
|
|
static inline int
|
|
irq_trace(void)
|
|
{
|
|
return ((trace_type & TRACER_IRQS_OFF) &&
|
|
irqs_disabled());
|
|
}
|
|
#else
|
|
# define irq_trace() (0)
|
|
#endif
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
static int irqsoff_display_graph(struct trace_array *tr, int set);
|
|
# define is_graph(tr) ((tr)->trace_flags & TRACE_ITER_DISPLAY_GRAPH)
|
|
#else
|
|
static inline int irqsoff_display_graph(struct trace_array *tr, int set)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
# define is_graph(tr) false
|
|
#endif
|
|
|
|
/*
|
|
* Sequence count - we record it when starting a measurement and
|
|
* skip the latency if the sequence has changed - some other section
|
|
* did a maximum and could disturb our measurement with serial console
|
|
* printouts, etc. Truly coinciding maximum latencies should be rare
|
|
* and what happens together happens separately as well, so this doesn't
|
|
* decrease the validity of the maximum found:
|
|
*/
|
|
static __cacheline_aligned_in_smp unsigned long max_sequence;
|
|
|
|
#ifdef CONFIG_FUNCTION_TRACER
|
|
/*
|
|
* Prologue for the preempt and irqs off function tracers.
|
|
*
|
|
* Returns 1 if it is OK to continue, and data->disabled is
|
|
* incremented.
|
|
* 0 if the trace is to be ignored, and data->disabled
|
|
* is kept the same.
|
|
*
|
|
* Note, this function is also used outside this ifdef but
|
|
* inside the #ifdef of the function graph tracer below.
|
|
* This is OK, since the function graph tracer is
|
|
* dependent on the function tracer.
|
|
*/
|
|
static int func_prolog_dec(struct trace_array *tr,
|
|
struct trace_array_cpu **data,
|
|
unsigned long *flags)
|
|
{
|
|
long disabled;
|
|
int cpu;
|
|
|
|
/*
|
|
* Does not matter if we preempt. We test the flags
|
|
* afterward, to see if irqs are disabled or not.
|
|
* If we preempt and get a false positive, the flags
|
|
* test will fail.
|
|
*/
|
|
cpu = raw_smp_processor_id();
|
|
if (likely(!per_cpu(tracing_cpu, cpu)))
|
|
return 0;
|
|
|
|
local_save_flags(*flags);
|
|
/*
|
|
* Slight chance to get a false positive on tracing_cpu,
|
|
* although I'm starting to think there isn't a chance.
|
|
* Leave this for now just to be paranoid.
|
|
*/
|
|
if (!irqs_disabled_flags(*flags) && !preempt_count())
|
|
return 0;
|
|
|
|
*data = per_cpu_ptr(tr->trace_buffer.data, cpu);
|
|
disabled = atomic_inc_return(&(*data)->disabled);
|
|
|
|
if (likely(disabled == 1))
|
|
return 1;
|
|
|
|
atomic_dec(&(*data)->disabled);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* irqsoff uses its own tracer function to keep the overhead down:
|
|
*/
|
|
static void
|
|
irqsoff_tracer_call(unsigned long ip, unsigned long parent_ip,
|
|
struct ftrace_ops *op, struct pt_regs *pt_regs)
|
|
{
|
|
struct trace_array *tr = irqsoff_trace;
|
|
struct trace_array_cpu *data;
|
|
unsigned long flags;
|
|
|
|
if (!func_prolog_dec(tr, &data, &flags))
|
|
return;
|
|
|
|
trace_function(tr, ip, parent_ip, flags, preempt_count());
|
|
|
|
atomic_dec(&data->disabled);
|
|
}
|
|
#endif /* CONFIG_FUNCTION_TRACER */
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
static int irqsoff_display_graph(struct trace_array *tr, int set)
|
|
{
|
|
int cpu;
|
|
|
|
if (!(is_graph(tr) ^ set))
|
|
return 0;
|
|
|
|
stop_irqsoff_tracer(irqsoff_trace, !set);
|
|
|
|
for_each_possible_cpu(cpu)
|
|
per_cpu(tracing_cpu, cpu) = 0;
|
|
|
|
tr->max_latency = 0;
|
|
tracing_reset_online_cpus(&irqsoff_trace->trace_buffer);
|
|
|
|
return start_irqsoff_tracer(irqsoff_trace, set);
|
|
}
|
|
|
|
static int irqsoff_graph_entry(struct ftrace_graph_ent *trace)
|
|
{
|
|
struct trace_array *tr = irqsoff_trace;
|
|
struct trace_array_cpu *data;
|
|
unsigned long flags;
|
|
int ret;
|
|
int pc;
|
|
|
|
if (!func_prolog_dec(tr, &data, &flags))
|
|
return 0;
|
|
|
|
pc = preempt_count();
|
|
ret = __trace_graph_entry(tr, trace, flags, pc);
|
|
atomic_dec(&data->disabled);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void irqsoff_graph_return(struct ftrace_graph_ret *trace)
|
|
{
|
|
struct trace_array *tr = irqsoff_trace;
|
|
struct trace_array_cpu *data;
|
|
unsigned long flags;
|
|
int pc;
|
|
|
|
if (!func_prolog_dec(tr, &data, &flags))
|
|
return;
|
|
|
|
pc = preempt_count();
|
|
__trace_graph_return(tr, trace, flags, pc);
|
|
atomic_dec(&data->disabled);
|
|
}
|
|
|
|
static void irqsoff_trace_open(struct trace_iterator *iter)
|
|
{
|
|
if (is_graph(iter->tr))
|
|
graph_trace_open(iter);
|
|
|
|
}
|
|
|
|
static void irqsoff_trace_close(struct trace_iterator *iter)
|
|
{
|
|
if (iter->private)
|
|
graph_trace_close(iter);
|
|
}
|
|
|
|
#define GRAPH_TRACER_FLAGS (TRACE_GRAPH_PRINT_CPU | \
|
|
TRACE_GRAPH_PRINT_PROC | \
|
|
TRACE_GRAPH_PRINT_ABS_TIME | \
|
|
TRACE_GRAPH_PRINT_DURATION)
|
|
|
|
static enum print_line_t irqsoff_print_line(struct trace_iterator *iter)
|
|
{
|
|
/*
|
|
* In graph mode call the graph tracer output function,
|
|
* otherwise go with the TRACE_FN event handler
|
|
*/
|
|
if (is_graph(iter->tr))
|
|
return print_graph_function_flags(iter, GRAPH_TRACER_FLAGS);
|
|
|
|
return TRACE_TYPE_UNHANDLED;
|
|
}
|
|
|
|
static void irqsoff_print_header(struct seq_file *s)
|
|
{
|
|
struct trace_array *tr = irqsoff_trace;
|
|
|
|
if (is_graph(tr))
|
|
print_graph_headers_flags(s, GRAPH_TRACER_FLAGS);
|
|
else
|
|
trace_default_header(s);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
#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_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);
|
|
}
|
|
#else
|
|
static void irqsoff_print_header(struct seq_file *s)
|
|
{
|
|
trace_latency_header(s);
|
|
}
|
|
#endif /* CONFIG_FUNCTION_TRACER */
|
|
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
|
|
|
|
/*
|
|
* Should this new latency be reported/recorded?
|
|
*/
|
|
static bool report_latency(struct trace_array *tr, cycle_t delta)
|
|
{
|
|
if (tracing_thresh) {
|
|
if (delta < tracing_thresh)
|
|
return false;
|
|
} else {
|
|
if (delta <= tr->max_latency)
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static void
|
|
check_critical_timing(struct trace_array *tr,
|
|
struct trace_array_cpu *data,
|
|
unsigned long parent_ip,
|
|
int cpu)
|
|
{
|
|
cycle_t T0, T1, delta;
|
|
unsigned long flags;
|
|
int pc;
|
|
|
|
T0 = data->preempt_timestamp;
|
|
T1 = ftrace_now(cpu);
|
|
delta = T1-T0;
|
|
|
|
local_save_flags(flags);
|
|
|
|
pc = preempt_count();
|
|
|
|
if (!report_latency(tr, delta))
|
|
goto out;
|
|
|
|
raw_spin_lock_irqsave(&max_trace_lock, flags);
|
|
|
|
/* check if we are still the max latency */
|
|
if (!report_latency(tr, delta))
|
|
goto out_unlock;
|
|
|
|
__trace_function(tr, CALLER_ADDR0, parent_ip, flags, pc);
|
|
/* Skip 5 functions to get to the irq/preempt enable function */
|
|
__trace_stack(tr, flags, 5, pc);
|
|
|
|
if (data->critical_sequence != max_sequence)
|
|
goto out_unlock;
|
|
|
|
data->critical_end = parent_ip;
|
|
|
|
if (likely(!is_tracing_stopped())) {
|
|
tr->max_latency = delta;
|
|
update_max_tr_single(tr, current, cpu);
|
|
}
|
|
|
|
max_sequence++;
|
|
|
|
out_unlock:
|
|
raw_spin_unlock_irqrestore(&max_trace_lock, flags);
|
|
|
|
out:
|
|
data->critical_sequence = max_sequence;
|
|
data->preempt_timestamp = ftrace_now(cpu);
|
|
__trace_function(tr, CALLER_ADDR0, parent_ip, flags, pc);
|
|
}
|
|
|
|
static inline void
|
|
start_critical_timing(unsigned long ip, unsigned long parent_ip)
|
|
{
|
|
int cpu;
|
|
struct trace_array *tr = irqsoff_trace;
|
|
struct trace_array_cpu *data;
|
|
unsigned long flags;
|
|
|
|
if (!tracer_enabled || !tracing_is_enabled())
|
|
return;
|
|
|
|
cpu = raw_smp_processor_id();
|
|
|
|
if (per_cpu(tracing_cpu, cpu))
|
|
return;
|
|
|
|
data = per_cpu_ptr(tr->trace_buffer.data, cpu);
|
|
|
|
if (unlikely(!data) || atomic_read(&data->disabled))
|
|
return;
|
|
|
|
atomic_inc(&data->disabled);
|
|
|
|
data->critical_sequence = max_sequence;
|
|
data->preempt_timestamp = ftrace_now(cpu);
|
|
data->critical_start = parent_ip ? : ip;
|
|
|
|
local_save_flags(flags);
|
|
|
|
__trace_function(tr, ip, parent_ip, flags, preempt_count());
|
|
|
|
per_cpu(tracing_cpu, cpu) = 1;
|
|
|
|
atomic_dec(&data->disabled);
|
|
}
|
|
|
|
static inline void
|
|
stop_critical_timing(unsigned long ip, unsigned long parent_ip)
|
|
{
|
|
int cpu;
|
|
struct trace_array *tr = irqsoff_trace;
|
|
struct trace_array_cpu *data;
|
|
unsigned long flags;
|
|
|
|
cpu = raw_smp_processor_id();
|
|
/* Always clear the tracing cpu on stopping the trace */
|
|
if (unlikely(per_cpu(tracing_cpu, cpu)))
|
|
per_cpu(tracing_cpu, cpu) = 0;
|
|
else
|
|
return;
|
|
|
|
if (!tracer_enabled || !tracing_is_enabled())
|
|
return;
|
|
|
|
data = per_cpu_ptr(tr->trace_buffer.data, cpu);
|
|
|
|
if (unlikely(!data) ||
|
|
!data->critical_start || atomic_read(&data->disabled))
|
|
return;
|
|
|
|
atomic_inc(&data->disabled);
|
|
|
|
local_save_flags(flags);
|
|
__trace_function(tr, ip, parent_ip, flags, preempt_count());
|
|
check_critical_timing(tr, data, parent_ip ? : ip, cpu);
|
|
data->critical_start = 0;
|
|
atomic_dec(&data->disabled);
|
|
}
|
|
|
|
/* start and stop critical timings used to for stoppage (in idle) */
|
|
void start_critical_timings(void)
|
|
{
|
|
if (preempt_trace() || irq_trace())
|
|
start_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
|
|
}
|
|
EXPORT_SYMBOL_GPL(start_critical_timings);
|
|
|
|
void stop_critical_timings(void)
|
|
{
|
|
if (preempt_trace() || irq_trace())
|
|
stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
|
|
}
|
|
EXPORT_SYMBOL_GPL(stop_critical_timings);
|
|
|
|
#ifdef CONFIG_IRQSOFF_TRACER
|
|
#ifdef CONFIG_PROVE_LOCKING
|
|
void time_hardirqs_on(unsigned long a0, unsigned long a1)
|
|
{
|
|
if (!preempt_trace() && irq_trace())
|
|
stop_critical_timing(a0, a1);
|
|
}
|
|
|
|
void time_hardirqs_off(unsigned long a0, unsigned long a1)
|
|
{
|
|
if (!preempt_trace() && irq_trace())
|
|
start_critical_timing(a0, a1);
|
|
}
|
|
|
|
#else /* !CONFIG_PROVE_LOCKING */
|
|
|
|
/*
|
|
* Stubs:
|
|
*/
|
|
|
|
void trace_softirqs_on(unsigned long ip)
|
|
{
|
|
}
|
|
|
|
void trace_softirqs_off(unsigned long ip)
|
|
{
|
|
}
|
|
|
|
inline void print_irqtrace_events(struct task_struct *curr)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* We are only interested in hardirq on/off events:
|
|
*/
|
|
void trace_hardirqs_on(void)
|
|
{
|
|
if (!preempt_trace() && irq_trace())
|
|
stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
|
|
}
|
|
EXPORT_SYMBOL(trace_hardirqs_on);
|
|
|
|
void trace_hardirqs_off(void)
|
|
{
|
|
if (!preempt_trace() && irq_trace())
|
|
start_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
|
|
}
|
|
EXPORT_SYMBOL(trace_hardirqs_off);
|
|
|
|
__visible void trace_hardirqs_on_caller(unsigned long caller_addr)
|
|
{
|
|
if (!preempt_trace() && irq_trace())
|
|
stop_critical_timing(CALLER_ADDR0, caller_addr);
|
|
}
|
|
EXPORT_SYMBOL(trace_hardirqs_on_caller);
|
|
|
|
__visible void trace_hardirqs_off_caller(unsigned long caller_addr)
|
|
{
|
|
if (!preempt_trace() && irq_trace())
|
|
start_critical_timing(CALLER_ADDR0, caller_addr);
|
|
}
|
|
EXPORT_SYMBOL(trace_hardirqs_off_caller);
|
|
|
|
#endif /* CONFIG_PROVE_LOCKING */
|
|
#endif /* CONFIG_IRQSOFF_TRACER */
|
|
|
|
#ifdef CONFIG_PREEMPT_TRACER
|
|
void trace_preempt_on(unsigned long a0, unsigned long a1)
|
|
{
|
|
if (preempt_trace() && !irq_trace())
|
|
stop_critical_timing(a0, a1);
|
|
}
|
|
|
|
void trace_preempt_off(unsigned long a0, unsigned long a1)
|
|
{
|
|
if (preempt_trace() && !irq_trace())
|
|
start_critical_timing(a0, 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;
|
|
|
|
/* '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(&irqsoff_graph_return,
|
|
&irqsoff_graph_entry);
|
|
else
|
|
ret = register_ftrace_function(tr->ops);
|
|
|
|
if (!ret)
|
|
function_enabled = true;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void unregister_irqsoff_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 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(tr), 1);
|
|
else
|
|
unregister_irqsoff_function(tr, is_graph(tr));
|
|
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 (irqsoff_function_set(tr, mask, set))
|
|
return 0;
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
if (mask & TRACE_ITER_DISPLAY_GRAPH)
|
|
return irqsoff_display_graph(tr, set);
|
|
#endif
|
|
|
|
return trace_keep_overwrite(tracer, mask, set);
|
|
}
|
|
|
|
static int start_irqsoff_tracer(struct trace_array *tr, int graph)
|
|
{
|
|
int ret;
|
|
|
|
ret = register_irqsoff_function(tr, graph, 0);
|
|
|
|
if (!ret && tracing_is_enabled())
|
|
tracer_enabled = 1;
|
|
else
|
|
tracer_enabled = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void stop_irqsoff_tracer(struct trace_array *tr, int graph)
|
|
{
|
|
tracer_enabled = 0;
|
|
|
|
unregister_irqsoff_function(tr, graph);
|
|
}
|
|
|
|
static bool irqsoff_busy;
|
|
|
|
static int __irqsoff_tracer_init(struct trace_array *tr)
|
|
{
|
|
if (irqsoff_busy)
|
|
return -EBUSY;
|
|
|
|
save_flags = tr->trace_flags;
|
|
|
|
/* non overwrite screws up the latency tracers */
|
|
set_tracer_flag(tr, TRACE_ITER_OVERWRITE, 1);
|
|
set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, 1);
|
|
|
|
tr->max_latency = 0;
|
|
irqsoff_trace = tr;
|
|
/* make sure that the tracer is visible */
|
|
smp_wmb();
|
|
|
|
ftrace_init_array_ops(tr, irqsoff_tracer_call);
|
|
|
|
/* Only toplevel instance supports graph tracing */
|
|
if (start_irqsoff_tracer(tr, (tr->flags & TRACE_ARRAY_FL_GLOBAL &&
|
|
is_graph(tr))))
|
|
printk(KERN_ERR "failed to start irqsoff tracer\n");
|
|
|
|
irqsoff_busy = true;
|
|
return 0;
|
|
}
|
|
|
|
static void irqsoff_tracer_reset(struct trace_array *tr)
|
|
{
|
|
int lat_flag = save_flags & TRACE_ITER_LATENCY_FMT;
|
|
int overwrite_flag = save_flags & TRACE_ITER_OVERWRITE;
|
|
|
|
stop_irqsoff_tracer(tr, is_graph(tr));
|
|
|
|
set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, lat_flag);
|
|
set_tracer_flag(tr, TRACE_ITER_OVERWRITE, overwrite_flag);
|
|
ftrace_reset_array_ops(tr);
|
|
|
|
irqsoff_busy = false;
|
|
}
|
|
|
|
static void irqsoff_tracer_start(struct trace_array *tr)
|
|
{
|
|
tracer_enabled = 1;
|
|
}
|
|
|
|
static void irqsoff_tracer_stop(struct trace_array *tr)
|
|
{
|
|
tracer_enabled = 0;
|
|
}
|
|
|
|
#ifdef CONFIG_IRQSOFF_TRACER
|
|
static int irqsoff_tracer_init(struct trace_array *tr)
|
|
{
|
|
trace_type = TRACER_IRQS_OFF;
|
|
|
|
return __irqsoff_tracer_init(tr);
|
|
}
|
|
static struct tracer irqsoff_tracer __read_mostly =
|
|
{
|
|
.name = "irqsoff",
|
|
.init = irqsoff_tracer_init,
|
|
.reset = irqsoff_tracer_reset,
|
|
.start = irqsoff_tracer_start,
|
|
.stop = irqsoff_tracer_stop,
|
|
.print_max = true,
|
|
.print_header = irqsoff_print_header,
|
|
.print_line = irqsoff_print_line,
|
|
.flag_changed = irqsoff_flag_changed,
|
|
#ifdef CONFIG_FTRACE_SELFTEST
|
|
.selftest = trace_selftest_startup_irqsoff,
|
|
#endif
|
|
.open = irqsoff_trace_open,
|
|
.close = irqsoff_trace_close,
|
|
.allow_instances = true,
|
|
.use_max_tr = true,
|
|
};
|
|
# define register_irqsoff(trace) register_tracer(&trace)
|
|
#else
|
|
# define register_irqsoff(trace) do { } while (0)
|
|
#endif
|
|
|
|
#ifdef CONFIG_PREEMPT_TRACER
|
|
static int preemptoff_tracer_init(struct trace_array *tr)
|
|
{
|
|
trace_type = TRACER_PREEMPT_OFF;
|
|
|
|
return __irqsoff_tracer_init(tr);
|
|
}
|
|
|
|
static struct tracer preemptoff_tracer __read_mostly =
|
|
{
|
|
.name = "preemptoff",
|
|
.init = preemptoff_tracer_init,
|
|
.reset = irqsoff_tracer_reset,
|
|
.start = irqsoff_tracer_start,
|
|
.stop = irqsoff_tracer_stop,
|
|
.print_max = true,
|
|
.print_header = irqsoff_print_header,
|
|
.print_line = irqsoff_print_line,
|
|
.flag_changed = irqsoff_flag_changed,
|
|
#ifdef CONFIG_FTRACE_SELFTEST
|
|
.selftest = trace_selftest_startup_preemptoff,
|
|
#endif
|
|
.open = irqsoff_trace_open,
|
|
.close = irqsoff_trace_close,
|
|
.allow_instances = true,
|
|
.use_max_tr = true,
|
|
};
|
|
# define register_preemptoff(trace) register_tracer(&trace)
|
|
#else
|
|
# define register_preemptoff(trace) do { } while (0)
|
|
#endif
|
|
|
|
#if defined(CONFIG_IRQSOFF_TRACER) && \
|
|
defined(CONFIG_PREEMPT_TRACER)
|
|
|
|
static int preemptirqsoff_tracer_init(struct trace_array *tr)
|
|
{
|
|
trace_type = TRACER_IRQS_OFF | TRACER_PREEMPT_OFF;
|
|
|
|
return __irqsoff_tracer_init(tr);
|
|
}
|
|
|
|
static struct tracer preemptirqsoff_tracer __read_mostly =
|
|
{
|
|
.name = "preemptirqsoff",
|
|
.init = preemptirqsoff_tracer_init,
|
|
.reset = irqsoff_tracer_reset,
|
|
.start = irqsoff_tracer_start,
|
|
.stop = irqsoff_tracer_stop,
|
|
.print_max = true,
|
|
.print_header = irqsoff_print_header,
|
|
.print_line = irqsoff_print_line,
|
|
.flag_changed = irqsoff_flag_changed,
|
|
#ifdef CONFIG_FTRACE_SELFTEST
|
|
.selftest = trace_selftest_startup_preemptirqsoff,
|
|
#endif
|
|
.open = irqsoff_trace_open,
|
|
.close = irqsoff_trace_close,
|
|
.allow_instances = true,
|
|
.use_max_tr = true,
|
|
};
|
|
|
|
# define register_preemptirqsoff(trace) register_tracer(&trace)
|
|
#else
|
|
# define register_preemptirqsoff(trace) do { } while (0)
|
|
#endif
|
|
|
|
__init static int init_irqsoff_tracer(void)
|
|
{
|
|
register_irqsoff(irqsoff_tracer);
|
|
register_preemptoff(preemptoff_tracer);
|
|
register_preemptirqsoff(preemptirqsoff_tracer);
|
|
|
|
return 0;
|
|
}
|
|
core_initcall(init_irqsoff_tracer);
|