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ftrace: Remove global function list and call function directly

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Instead of having a list of global functions that are called,
as only one global function is allow to be enabled at a time, there's
no reason to have a list.

Instead, simply have all the users of the global ops, use the global ops
directly, instead of registering their own ftrace_ops. Just switch what
function is used before enabling the function tracer.

This removes a lot of code as well as the complexity involved with it.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-01-10 17:01:58 -05:00 committed by Steven Rostedt
parent a798c10faf
commit 4104d326b6
8 changed files with 133 additions and 221 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

20
include/linux/ftrace.h
View file

@ -62,9 +62,6 @@ typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip,
* set in the flags member.
*
* ENABLED - set/unset when ftrace_ops is registered/unregistered
* GLOBAL - set manualy by ftrace_ops user to denote the ftrace_ops
* is part of the global tracers sharing the same filter
* via set_ftrace_* debugfs files.
* DYNAMIC - set when ftrace_ops is registered to denote dynamically
* allocated ftrace_ops which need special care
* CONTROL - set manualy by ftrace_ops user to denote the ftrace_ops
@ -96,15 +93,14 @@ typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip,
*/
enum {
FTRACE_OPS_FL_ENABLED = 1 << 0,
FTRACE_OPS_FL_GLOBAL = 1 << 1,
FTRACE_OPS_FL_DYNAMIC = 1 << 2,
FTRACE_OPS_FL_CONTROL = 1 << 3,
FTRACE_OPS_FL_SAVE_REGS = 1 << 4,
FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED = 1 << 5,
FTRACE_OPS_FL_RECURSION_SAFE = 1 << 6,
FTRACE_OPS_FL_STUB = 1 << 7,
FTRACE_OPS_FL_INITIALIZED = 1 << 8,
FTRACE_OPS_FL_DELETED = 1 << 9,
FTRACE_OPS_FL_DYNAMIC = 1 << 1,
FTRACE_OPS_FL_CONTROL = 1 << 2,
FTRACE_OPS_FL_SAVE_REGS = 1 << 3,
FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED = 1 << 4,
FTRACE_OPS_FL_RECURSION_SAFE = 1 << 5,
FTRACE_OPS_FL_STUB = 1 << 6,
FTRACE_OPS_FL_INITIALIZED = 1 << 7,
FTRACE_OPS_FL_DELETED = 1 << 8,
};
/*

152
kernel/trace/ftrace.c
View file

@ -62,7 +62,7 @@
#define FTRACE_HASH_DEFAULT_BITS 10
#define FTRACE_HASH_MAX_BITS 12
#define FL_GLOBAL_CONTROL_MASK (FTRACE_OPS_FL_GLOBAL | FTRACE_OPS_FL_CONTROL)
#define FL_GLOBAL_CONTROL_MASK (FTRACE_OPS_FL_CONTROL)
#ifdef CONFIG_DYNAMIC_FTRACE
#define INIT_REGEX_LOCK(opsname) \
@ -103,7 +103,6 @@ static int ftrace_disabled __read_mostly;
static DEFINE_MUTEX(ftrace_lock);
static struct ftrace_ops *ftrace_global_list __read_mostly = &ftrace_list_end;
static struct ftrace_ops *ftrace_control_list __read_mostly = &ftrace_list_end;
static struct ftrace_ops *ftrace_ops_list __read_mostly = &ftrace_list_end;
ftrace_func_t ftrace_trace_function __read_mostly = ftrace_stub;
@ -171,23 +170,6 @@ int ftrace_nr_registered_ops(void)
return cnt;
}
static void
ftrace_global_list_func(unsigned long ip, unsigned long parent_ip,
struct ftrace_ops *op, struct pt_regs *regs)
{
int bit;
bit = trace_test_and_set_recursion(TRACE_GLOBAL_START, TRACE_GLOBAL_MAX);
if (bit < 0)
return;
do_for_each_ftrace_op(op, ftrace_global_list) {
op->func(ip, parent_ip, op, regs);
} while_for_each_ftrace_op(op);
trace_clear_recursion(bit);
}
static void ftrace_pid_func(unsigned long ip, unsigned long parent_ip,
struct ftrace_ops *op, struct pt_regs *regs)
{
@ -237,43 +219,6 @@ static int control_ops_alloc(struct ftrace_ops *ops)
return 0;
}
static void update_global_ops(void)
{
ftrace_func_t func = ftrace_global_list_func;
void *private = NULL;
/* The list has its own recursion protection. */
global_ops.flags |= FTRACE_OPS_FL_RECURSION_SAFE;
/*
* If there's only one function registered, then call that
* function directly. Otherwise, we need to iterate over the
* registered callers.
*/
if (ftrace_global_list == &ftrace_list_end ||
ftrace_global_list->next == &ftrace_list_end) {
func = ftrace_global_list->func;
private = ftrace_global_list->private;
/*
* As we are calling the function directly.
* If it does not have recursion protection,
* the function_trace_op needs to be updated
* accordingly.
*/
if (!(ftrace_global_list->flags & FTRACE_OPS_FL_RECURSION_SAFE))
global_ops.flags &= ~FTRACE_OPS_FL_RECURSION_SAFE;
}
/* If we filter on pids, update to use the pid function */
if (!list_empty(&ftrace_pids)) {
set_ftrace_pid_function(func);
func = ftrace_pid_func;
}
global_ops.func = func;
global_ops.private = private;
}
static void ftrace_sync(struct work_struct *work)
{
/*
@ -301,8 +246,6 @@ static void update_ftrace_function(void)
{
ftrace_func_t func;
update_global_ops();
/*
* If we are at the end of the list and this ops is
* recursion safe and not dynamic and the arch supports passing ops,
@ -314,10 +257,7 @@ static void update_ftrace_function(void)
(ftrace_ops_list->flags & FTRACE_OPS_FL_RECURSION_SAFE) &&
!FTRACE_FORCE_LIST_FUNC)) {
/* Set the ftrace_ops that the arch callback uses */
if (ftrace_ops_list == &global_ops)
set_function_trace_op = ftrace_global_list;
else
set_function_trace_op = ftrace_ops_list;
set_function_trace_op = ftrace_ops_list;
func = ftrace_ops_list->func;
} else {
/* Just use the default ftrace_ops */
@ -434,16 +374,9 @@ static int __register_ftrace_function(struct ftrace_ops *ops)
if (ops->flags & FTRACE_OPS_FL_DELETED)
return -EINVAL;
if (FTRACE_WARN_ON(ops == &global_ops))
return -EINVAL;
if (WARN_ON(ops->flags & FTRACE_OPS_FL_ENABLED))
return -EBUSY;
/* We don't support both control and global flags set. */
if ((ops->flags & FL_GLOBAL_CONTROL_MASK) == FL_GLOBAL_CONTROL_MASK)
return -EINVAL;
#ifndef CONFIG_DYNAMIC_FTRACE_WITH_REGS
/*
* If the ftrace_ops specifies SAVE_REGS, then it only can be used
@ -461,10 +394,7 @@ static int __register_ftrace_function(struct ftrace_ops *ops)
if (!core_kernel_data((unsigned long)ops))
ops->flags |= FTRACE_OPS_FL_DYNAMIC;
if (ops->flags & FTRACE_OPS_FL_GLOBAL) {
add_ftrace_list_ops(&ftrace_global_list, &global_ops, ops);
ops->flags |= FTRACE_OPS_FL_ENABLED;
} else if (ops->flags & FTRACE_OPS_FL_CONTROL) {
if (ops->flags & FTRACE_OPS_FL_CONTROL) {
if (control_ops_alloc(ops))
return -ENOMEM;
add_ftrace_list_ops(&ftrace_control_list, &control_ops, ops);
@ -484,15 +414,7 @@ static int __unregister_ftrace_function(struct ftrace_ops *ops)
if (WARN_ON(!(ops->flags & FTRACE_OPS_FL_ENABLED)))
return -EBUSY;
if (FTRACE_WARN_ON(ops == &global_ops))
return -EINVAL;
if (ops->flags & FTRACE_OPS_FL_GLOBAL) {
ret = remove_ftrace_list_ops(&ftrace_global_list,
&global_ops, ops);
if (!ret)
ops->flags &= ~FTRACE_OPS_FL_ENABLED;
} else if (ops->flags & FTRACE_OPS_FL_CONTROL) {
if (ops->flags & FTRACE_OPS_FL_CONTROL) {
ret = remove_ftrace_list_ops(&ftrace_control_list,
&control_ops, ops);
} else
@ -2128,15 +2050,6 @@ static int ftrace_startup(struct ftrace_ops *ops, int command)
ftrace_start_up++;
command |= FTRACE_UPDATE_CALLS;
/* ops marked global share the filter hashes */
if (ops->flags & FTRACE_OPS_FL_GLOBAL) {
ops = &global_ops;
/* Don't update hash if global is already set */
if (global_start_up)
hash_enable = false;
global_start_up++;
}
ops->flags |= FTRACE_OPS_FL_ENABLED;
if (hash_enable)
ftrace_hash_rec_enable(ops, 1);
@ -2166,21 +2079,10 @@ static int ftrace_shutdown(struct ftrace_ops *ops, int command)
*/
WARN_ON_ONCE(ftrace_start_up < 0);
if (ops->flags & FTRACE_OPS_FL_GLOBAL) {
ops = &global_ops;
global_start_up--;
WARN_ON_ONCE(global_start_up < 0);
/* Don't update hash if global still has users */
if (global_start_up) {
WARN_ON_ONCE(!ftrace_start_up);
hash_disable = false;
}
}
if (hash_disable)
ftrace_hash_rec_disable(ops, 1);
if (ops != &global_ops || !global_start_up)
if (!global_start_up)
ops->flags &= ~FTRACE_OPS_FL_ENABLED;
command |= FTRACE_UPDATE_CALLS;
@ -3524,10 +3426,6 @@ ftrace_set_hash(struct ftrace_ops *ops, unsigned char *buf, int len,
struct ftrace_hash *hash;
int ret;
/* All global ops uses the global ops filters */
if (ops->flags & FTRACE_OPS_FL_GLOBAL)
ops = &global_ops;
if (unlikely(ftrace_disabled))
return -ENODEV;
@ -4462,6 +4360,34 @@ ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip, void *regs)
#endif /* CONFIG_DYNAMIC_FTRACE */
__init void ftrace_init_global_array_ops(struct trace_array *tr)
{
tr->ops = &global_ops;
tr->ops->private = tr;
}
void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func)
{
/* If we filter on pids, update to use the pid function */
if (tr->flags & TRACE_ARRAY_FL_GLOBAL) {
if (WARN_ON(tr->ops->func != ftrace_stub))
printk("ftrace ops had %pS for function\n",
tr->ops->func);
/* Only the top level instance does pid tracing */
if (!list_empty(&ftrace_pids)) {
set_ftrace_pid_function(func);
func = ftrace_pid_func;
}
}
tr->ops->func = func;
tr->ops->private = tr;
}
void ftrace_reset_array_ops(struct trace_array *tr)
{
tr->ops->func = ftrace_stub;
}
static void
ftrace_ops_control_func(unsigned long ip, unsigned long parent_ip,
struct ftrace_ops *op, struct pt_regs *regs)
@ -4520,9 +4446,16 @@ __ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
*/
preempt_disable_notrace();
do_for_each_ftrace_op(op, ftrace_ops_list) {
if (ftrace_ops_test(op, ip, regs))
if (ftrace_ops_test(op, ip, regs)) {
if (WARN_ON(!op->func)) {
function_trace_stop = 1;
printk("op=%p %pS\n", op, op);
goto out;
}
op->func(ip, parent_ip, op, regs);
}
} while_for_each_ftrace_op(op);
out:
preempt_enable_notrace();
trace_clear_recursion(bit);
}
@ -5076,8 +5009,7 @@ ftrace_suspend_notifier_call(struct notifier_block *bl, unsigned long state,
/* Just a place holder for function graph */
static struct ftrace_ops fgraph_ops __read_mostly = {
.func = ftrace_stub,
.flags = FTRACE_OPS_FL_STUB | FTRACE_OPS_FL_GLOBAL |
FTRACE_OPS_FL_RECURSION_SAFE,
.flags = FTRACE_OPS_FL_STUB | FTRACE_OPS_FL_RECURSION_SAFE,
};
static int ftrace_graph_entry_test(struct ftrace_graph_ent *trace)

2
kernel/trace/trace.c
View file

@ -6629,6 +6629,8 @@ __init static int tracer_alloc_buffers(void)
*/
global_trace.current_trace = &nop_trace;
ftrace_init_global_array_ops(&global_trace);
register_tracer(&nop_trace);
/* All seems OK, enable tracing */

19
kernel/trace/trace.h
View file

@ -416,13 +416,7 @@ enum {
TRACE_FTRACE_IRQ_BIT,
TRACE_FTRACE_SIRQ_BIT,
/* GLOBAL_BITs must be greater than FTRACE_BITs */
TRACE_GLOBAL_BIT,
TRACE_GLOBAL_NMI_BIT,
TRACE_GLOBAL_IRQ_BIT,
TRACE_GLOBAL_SIRQ_BIT,
/* INTERNAL_BITs must be greater than GLOBAL_BITs */
/* INTERNAL_BITs must be greater than FTRACE_BITs */
TRACE_INTERNAL_BIT,
TRACE_INTERNAL_NMI_BIT,
TRACE_INTERNAL_IRQ_BIT,
@ -449,9 +443,6 @@ enum {
#define TRACE_FTRACE_START TRACE_FTRACE_BIT
#define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
#define TRACE_GLOBAL_START TRACE_GLOBAL_BIT
#define TRACE_GLOBAL_MAX ((1 << (TRACE_GLOBAL_START + TRACE_CONTEXT_BITS)) - 1)
#define TRACE_LIST_START TRACE_INTERNAL_BIT
#define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
@ -823,6 +814,9 @@ extern int ftrace_is_dead(void);
int ftrace_create_function_files(struct trace_array *tr,
struct dentry *parent);
void ftrace_destroy_function_files(struct trace_array *tr);
void ftrace_init_global_array_ops(struct trace_array *tr);
void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
void ftrace_reset_array_ops(struct trace_array *tr);
#else
static inline int ftrace_trace_task(struct task_struct *task)
{
@ -836,6 +830,11 @@ ftrace_create_function_files(struct trace_array *tr,
return 0;
}
static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
static inline __init void
ftrace_init_global_array_ops(struct trace_array *tr) { }
static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
/* ftace_func_t type is not defined, use macro instead of static inline */
#define ftrace_init_array_ops(tr, func) do { } while (0)
#endif /* CONFIG_FUNCTION_TRACER */
#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)

55
kernel/trace/trace_functions.c
View file

@ -26,8 +26,6 @@ function_trace_call(unsigned long ip, unsigned long parent_ip,
static void
function_stack_trace_call(unsigned long ip, unsigned long parent_ip,
struct ftrace_ops *op, struct pt_regs *pt_regs);
static struct ftrace_ops trace_ops;
static struct ftrace_ops trace_stack_ops;
static struct tracer_flags func_flags;
/* Our option */
@ -83,28 +81,24 @@ void ftrace_destroy_function_files(struct trace_array *tr)
static int function_trace_init(struct trace_array *tr)
{
struct ftrace_ops *ops;
ftrace_func_t func;
if (tr->flags & TRACE_ARRAY_FL_GLOBAL) {
/* There's only one global tr */
if (!trace_ops.private) {
trace_ops.private = tr;
trace_stack_ops.private = tr;
}
if (func_flags.val & TRACE_FUNC_OPT_STACK)
ops = &trace_stack_ops;
else
ops = &trace_ops;
tr->ops = ops;
} else if (!tr->ops) {
/*
* Instance trace_arrays get their ops allocated
* at instance creation. Unless it failed
* the allocation.
*/
/*
* Instance trace_arrays get their ops allocated
* at instance creation. Unless it failed
* the allocation.
*/
if (!tr->ops)
return -ENOMEM;
}
/* Currently only the global instance can do stack tracing */
if (tr->flags & TRACE_ARRAY_FL_GLOBAL &&
func_flags.val & TRACE_FUNC_OPT_STACK)
func = function_stack_trace_call;
else
func = function_trace_call;
ftrace_init_array_ops(tr, func);
tr->trace_buffer.cpu = get_cpu();
put_cpu();
@ -118,6 +112,7 @@ static void function_trace_reset(struct trace_array *tr)
{
tracing_stop_function_trace(tr);
tracing_stop_cmdline_record();
ftrace_reset_array_ops(tr);
}
static void function_trace_start(struct trace_array *tr)
@ -199,18 +194,6 @@ function_stack_trace_call(unsigned long ip, unsigned long parent_ip,
local_irq_restore(flags);
}
static struct ftrace_ops trace_ops __read_mostly =
{
.func = function_trace_call,
.flags = FTRACE_OPS_FL_GLOBAL | FTRACE_OPS_FL_RECURSION_SAFE,
};
static struct ftrace_ops trace_stack_ops __read_mostly =
{
.func = function_stack_trace_call,
.flags = FTRACE_OPS_FL_GLOBAL | FTRACE_OPS_FL_RECURSION_SAFE,
};
static struct tracer_opt func_opts[] = {
#ifdef CONFIG_STACKTRACE
{ TRACER_OPT(func_stack_trace, TRACE_FUNC_OPT_STACK) },
@ -248,10 +231,10 @@ func_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
unregister_ftrace_function(tr->ops);
if (set) {
tr->ops = &trace_stack_ops;
tr->ops->func = function_stack_trace_call;
register_ftrace_function(tr->ops);
} else {
tr->ops = &trace_ops;
tr->ops->func = function_trace_call;
register_ftrace_function(tr->ops);
}

33
kernel/trace/trace_irqsoff.c
View file

@ -151,12 +151,6 @@ irqsoff_tracer_call(unsigned long ip, unsigned long parent_ip,
atomic_dec(&data->disabled);
}
static struct ftrace_ops trace_ops __read_mostly =
{
.func = irqsoff_tracer_call,
.flags = FTRACE_OPS_FL_GLOBAL | FTRACE_OPS_FL_RECURSION_SAFE,
};
#endif /* CONFIG_FUNCTION_TRACER */
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
@ -531,7 +525,7 @@ void trace_preempt_off(unsigned long a0, unsigned long a1)
}
#endif /* CONFIG_PREEMPT_TRACER */
static int register_irqsoff_function(int graph, int set)
static int register_irqsoff_function(struct trace_array *tr, int graph, int set)
{
int ret;
@ -543,7 +537,7 @@ static int register_irqsoff_function(int graph, int set)
ret = register_ftrace_graph(&irqsoff_graph_return,
&irqsoff_graph_entry);
else
ret = register_ftrace_function(&trace_ops);
ret = register_ftrace_function(tr->ops);
if (!ret)
function_enabled = true;
@ -551,7 +545,7 @@ static int register_irqsoff_function(int graph, int set)
return ret;
}
static void unregister_irqsoff_function(int graph)
static void unregister_irqsoff_function(struct trace_array *tr, int graph)
{
if (!function_enabled)
return;
@ -559,17 +553,17 @@ static void unregister_irqsoff_function(int graph)
if (graph)
unregister_ftrace_graph();
else
unregister_ftrace_function(&trace_ops);
unregister_ftrace_function(tr->ops);
function_enabled = false;
}
static void irqsoff_function_set(int set)
static void irqsoff_function_set(struct trace_array *tr, int set)
{
if (set)
register_irqsoff_function(is_graph(), 1);
register_irqsoff_function(tr, is_graph(), 1);
else
unregister_irqsoff_function(is_graph());
unregister_irqsoff_function(tr, is_graph());
}
static int irqsoff_flag_changed(struct trace_array *tr, u32 mask, int set)
@ -577,7 +571,7 @@ static int irqsoff_flag_changed(struct trace_array *tr, u32 mask, int set)
struct tracer *tracer = tr->current_trace;
if (mask & TRACE_ITER_FUNCTION)
irqsoff_function_set(set);
irqsoff_function_set(tr, set);
return trace_keep_overwrite(tracer, mask, set);
}
@ -586,7 +580,7 @@ static int start_irqsoff_tracer(struct trace_array *tr, int graph)
{
int ret;
ret = register_irqsoff_function(graph, 0);
ret = register_irqsoff_function(tr, graph, 0);
if (!ret && tracing_is_enabled())
tracer_enabled = 1;
@ -600,7 +594,7 @@ static void stop_irqsoff_tracer(struct trace_array *tr, int graph)
{
tracer_enabled = 0;
unregister_irqsoff_function(graph);
unregister_irqsoff_function(tr, graph);
}
static void __irqsoff_tracer_init(struct trace_array *tr)
@ -617,7 +611,11 @@ static void __irqsoff_tracer_init(struct trace_array *tr)
smp_wmb();
tracing_reset_online_cpus(&tr->trace_buffer);
if (start_irqsoff_tracer(tr, is_graph()))
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())))
printk(KERN_ERR "failed to start irqsoff tracer\n");
}
@ -630,6 +628,7 @@ static void irqsoff_tracer_reset(struct trace_array *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);
}
static void irqsoff_tracer_start(struct trace_array *tr)

40
kernel/trace/trace_sched_wakeup.c
View file

@ -130,15 +130,9 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip,
atomic_dec(&data->disabled);
preempt_enable_notrace();
}
static struct ftrace_ops trace_ops __read_mostly =
{
.func = wakeup_tracer_call,
.flags = FTRACE_OPS_FL_GLOBAL | FTRACE_OPS_FL_RECURSION_SAFE,
};
#endif /* CONFIG_FUNCTION_TRACER */
static int register_wakeup_function(int graph, int set)
static int register_wakeup_function(struct trace_array *tr, int graph, int set)
{
int ret;
@ -150,7 +144,7 @@ static int register_wakeup_function(int graph, int set)
ret = register_ftrace_graph(&wakeup_graph_return,
&wakeup_graph_entry);
else
ret = register_ftrace_function(&trace_ops);
ret = register_ftrace_function(tr->ops);
if (!ret)
function_enabled = true;
@ -158,7 +152,7 @@ static int register_wakeup_function(int graph, int set)
return ret;
}
static void unregister_wakeup_function(int graph)
static void unregister_wakeup_function(struct trace_array *tr, int graph)
{
if (!function_enabled)
return;
@ -166,17 +160,17 @@ static void unregister_wakeup_function(int graph)
if (graph)
unregister_ftrace_graph();
else
unregister_ftrace_function(&trace_ops);
unregister_ftrace_function(tr->ops);
function_enabled = false;
}
static void wakeup_function_set(int set)
static void wakeup_function_set(struct trace_array *tr, int set)
{
if (set)
register_wakeup_function(is_graph(), 1);
register_wakeup_function(tr, is_graph(), 1);
else
unregister_wakeup_function(is_graph());
unregister_wakeup_function(tr, is_graph());
}
static int wakeup_flag_changed(struct trace_array *tr, u32 mask, int set)
@ -184,16 +178,16 @@ static int wakeup_flag_changed(struct trace_array *tr, u32 mask, int set)
struct tracer *tracer = tr->current_trace;
if (mask & TRACE_ITER_FUNCTION)
wakeup_function_set(set);
wakeup_function_set(tr, set);
return trace_keep_overwrite(tracer, mask, set);
}
static int start_func_tracer(int graph)
static int start_func_tracer(struct trace_array *tr, int graph)
{
int ret;
ret = register_wakeup_function(graph, 0);
ret = register_wakeup_function(tr, graph, 0);
if (!ret && tracing_is_enabled())
tracer_enabled = 1;
@ -203,11 +197,11 @@ static int start_func_tracer(int graph)
return ret;
}
static void stop_func_tracer(int graph)
static void stop_func_tracer(struct trace_array *tr, int graph)
{
tracer_enabled = 0;
unregister_wakeup_function(graph);
unregister_wakeup_function(tr, graph);
}
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
@ -221,12 +215,12 @@ wakeup_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
if (!(is_graph() ^ set))
return 0;
stop_func_tracer(!set);
stop_func_tracer(tr, !set);
wakeup_reset(wakeup_trace);
tracing_max_latency = 0;
return start_func_tracer(set);
return start_func_tracer(tr, set);
}
static int wakeup_graph_entry(struct ftrace_graph_ent *trace)
@ -587,7 +581,7 @@ static void start_wakeup_tracer(struct trace_array *tr)
*/
smp_wmb();
if (start_func_tracer(is_graph()))
if (start_func_tracer(tr, is_graph()))
printk(KERN_ERR "failed to start wakeup tracer\n");
return;
@ -600,7 +594,7 @@ static void start_wakeup_tracer(struct trace_array *tr)
static void stop_wakeup_tracer(struct trace_array *tr)
{
tracer_enabled = 0;
stop_func_tracer(is_graph());
stop_func_tracer(tr, is_graph());
unregister_trace_sched_switch(probe_wakeup_sched_switch, NULL);
unregister_trace_sched_wakeup_new(probe_wakeup, NULL);
unregister_trace_sched_wakeup(probe_wakeup, NULL);
@ -617,6 +611,7 @@ static int __wakeup_tracer_init(struct trace_array *tr)
tracing_max_latency = 0;
wakeup_trace = tr;
ftrace_init_array_ops(tr, wakeup_tracer_call);
start_wakeup_tracer(tr);
return 0;
}
@ -653,6 +648,7 @@ static void wakeup_tracer_reset(struct trace_array *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);
}
static void wakeup_tracer_start(struct trace_array *tr)

33
kernel/trace/trace_selftest.c
View file

@ -161,11 +161,6 @@ static struct ftrace_ops test_probe3 = {
.flags = FTRACE_OPS_FL_RECURSION_SAFE,
};
static struct ftrace_ops test_global = {
.func = trace_selftest_test_global_func,
.flags = FTRACE_OPS_FL_GLOBAL | FTRACE_OPS_FL_RECURSION_SAFE,
};
static void print_counts(void)
{
printk("(%d %d %d %d %d) ",
@ -185,7 +180,7 @@ static void reset_counts(void)
trace_selftest_test_dyn_cnt = 0;
}
static int trace_selftest_ops(int cnt)
static int trace_selftest_ops(struct trace_array *tr, int cnt)
{
int save_ftrace_enabled = ftrace_enabled;
struct ftrace_ops *dyn_ops;
@ -220,7 +215,11 @@ static int trace_selftest_ops(int cnt)
register_ftrace_function(&test_probe1);
register_ftrace_function(&test_probe2);
register_ftrace_function(&test_probe3);
register_ftrace_function(&test_global);
/* First time we are running with main function */
if (cnt > 1) {
ftrace_init_array_ops(tr, trace_selftest_test_global_func);
register_ftrace_function(tr->ops);
}
DYN_FTRACE_TEST_NAME();
@ -232,8 +231,10 @@ static int trace_selftest_ops(int cnt)
goto out;
if (trace_selftest_test_probe3_cnt != 1)
goto out;
if (trace_selftest_test_global_cnt == 0)
goto out;
if (cnt > 1) {
if (trace_selftest_test_global_cnt == 0)
goto out;
}
DYN_FTRACE_TEST_NAME2();
@ -269,8 +270,10 @@ static int trace_selftest_ops(int cnt)
goto out_free;
if (trace_selftest_test_probe3_cnt != 3)
goto out_free;
if (trace_selftest_test_global_cnt == 0)
goto out;
if (cnt > 1) {
if (trace_selftest_test_global_cnt == 0)
goto out;
}
if (trace_selftest_test_dyn_cnt == 0)
goto out_free;
@ -295,7 +298,9 @@ static int trace_selftest_ops(int cnt)
unregister_ftrace_function(&test_probe1);
unregister_ftrace_function(&test_probe2);
unregister_ftrace_function(&test_probe3);
unregister_ftrace_function(&test_global);
if (cnt > 1)
unregister_ftrace_function(tr->ops);
ftrace_reset_array_ops(tr);
/* Make sure everything is off */
reset_counts();
@ -388,7 +393,7 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
}
/* Test the ops with global tracing running */
ret = trace_selftest_ops(1);
ret = trace_selftest_ops(tr, 1);
trace->reset(tr);
out:
@ -399,7 +404,7 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
/* Test the ops with global tracing off */
if (!ret)
ret = trace_selftest_ops(2);
ret = trace_selftest_ops(tr, 2);
return ret;
}