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tracing/function-return-tracer: change the name into function-graph-tracer

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Impact: cleanup

This patch changes the name of the "return function tracer" into
function-graph-tracer which is a more suitable name for a tracing
which makes one able to retrieve the ordered call stack during
the code flow.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Frederic Weisbecker
2008-11-25 21:07:04 +01:00
committed by Ingo Molnar
parent 509dceef64
commit fb52607afc
17 changed files with 173 additions and 72 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
kernel/trace/Kconfig
View File

@@ -12,7 +12,7 @@ config NOP_TRACER
config HAVE_FUNCTION_TRACER
bool
config HAVE_FUNCTION_RET_TRACER
config HAVE_FUNCTION_GRAPH_TRACER
bool
config HAVE_FUNCTION_TRACE_MCOUNT_TEST
@@ -63,15 +63,18 @@ config FUNCTION_TRACER
(the bootup default), then the overhead of the instructions is very
small and not measurable even in micro-benchmarks.
config FUNCTION_RET_TRACER
bool "Kernel Function return Tracer"
depends on HAVE_FUNCTION_RET_TRACER
config FUNCTION_GRAPH_TRACER
bool "Kernel Function Graph Tracer"
depends on HAVE_FUNCTION_GRAPH_TRACER
depends on FUNCTION_TRACER
help
Enable the kernel to trace a function at its return.
It's first purpose is to trace the duration of functions.
This is done by setting the current return address on the thread
info structure of the current task.
Enable the kernel to trace a function at both its return
and its entry.
It's first purpose is to trace the duration of functions and
draw a call graph for each thread with some informations like
the return value.
This is done by setting the current return address on the current
task structure into a stack of calls.
config IRQSOFF_TRACER
bool "Interrupts-off Latency Tracer"

2
kernel/trace/Makefile
View File

@@ -29,7 +29,7 @@ obj-$(CONFIG_NOP_TRACER) += trace_nop.o
obj-$(CONFIG_STACK_TRACER) += trace_stack.o
obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
obj-$(CONFIG_BOOT_TRACER) += trace_boot.o
obj-$(CONFIG_FUNCTION_RET_TRACER) += trace_functions_return.o
obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += trace_functions_graph.o
obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o
obj-$(CONFIG_BTS_TRACER) += trace_bts.o

26
kernel/trace/ftrace.c
View File

@@ -395,11 +395,11 @@ __ftrace_replace_code(struct dyn_ftrace *rec, int enable)
unsigned long ip, fl;
unsigned long ftrace_addr;
#ifdef CONFIG_FUNCTION_RET_TRACER
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
if (ftrace_tracing_type == FTRACE_TYPE_ENTER)
ftrace_addr = (unsigned long)ftrace_caller;
else
ftrace_addr = (unsigned long)ftrace_return_caller;
ftrace_addr = (unsigned long)ftrace_graph_caller;
#else
ftrace_addr = (unsigned long)ftrace_caller;
#endif
@@ -1496,13 +1496,13 @@ ftrace_enable_sysctl(struct ctl_table *table, int write,
return ret;
}
#ifdef CONFIG_FUNCTION_RET_TRACER
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
static atomic_t ftrace_retfunc_active;
/* The callback that hooks the return of a function */
trace_function_return_t ftrace_function_return =
(trace_function_return_t)ftrace_stub;
trace_function_graph_t ftrace_graph_function =
(trace_function_graph_t)ftrace_stub;
/* Try to assign a return stack array on FTRACE_RETSTACK_ALLOC_SIZE tasks. */
@@ -1549,7 +1549,7 @@ free:
}
/* Allocate a return stack for each task */
static int start_return_tracing(void)
static int start_graph_tracing(void)
{
struct ftrace_ret_stack **ret_stack_list;
int ret;
@@ -1569,7 +1569,7 @@ static int start_return_tracing(void)
return ret;
}
int register_ftrace_return(trace_function_return_t func)
int register_ftrace_graph(trace_function_graph_t func)
{
int ret = 0;
@@ -1584,13 +1584,13 @@ int register_ftrace_return(trace_function_return_t func)
goto out;
}
atomic_inc(&ftrace_retfunc_active);
ret = start_return_tracing();
ret = start_graph_tracing();
if (ret) {
atomic_dec(&ftrace_retfunc_active);
goto out;
}
ftrace_tracing_type = FTRACE_TYPE_RETURN;
ftrace_function_return = func;
ftrace_graph_function = func;
ftrace_startup();
out:
@@ -1598,12 +1598,12 @@ out:
return ret;
}
void unregister_ftrace_return(void)
void unregister_ftrace_graph(void)
{
mutex_lock(&ftrace_sysctl_lock);
atomic_dec(&ftrace_retfunc_active);
ftrace_function_return = (trace_function_return_t)ftrace_stub;
ftrace_graph_function = (trace_function_graph_t)ftrace_stub;
ftrace_shutdown();
/* Restore normal tracing type */
ftrace_tracing_type = FTRACE_TYPE_ENTER;
@@ -1612,7 +1612,7 @@ void unregister_ftrace_return(void)
}
/* Allocate a return stack for newly created task */
void ftrace_retfunc_init_task(struct task_struct *t)
void ftrace_graph_init_task(struct task_struct *t)
{
if (atomic_read(&ftrace_retfunc_active)) {
t->ret_stack = kmalloc(FTRACE_RETFUNC_DEPTH
@@ -1626,7 +1626,7 @@ void ftrace_retfunc_init_task(struct task_struct *t)
t->ret_stack = NULL;
}
void ftrace_retfunc_exit_task(struct task_struct *t)
void ftrace_graph_exit_task(struct task_struct *t)
{
struct ftrace_ret_stack *ret_stack = t->ret_stack;

18
kernel/trace/trace.c
View File

@@ -878,15 +878,15 @@ trace_function(struct trace_array *tr, struct trace_array_cpu *data,
ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
}
#ifdef CONFIG_FUNCTION_RET_TRACER
static void __trace_function_return(struct trace_array *tr,
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
static void __trace_function_graph(struct trace_array *tr,
struct trace_array_cpu *data,
struct ftrace_retfunc *trace,
struct ftrace_graph_ret *trace,
unsigned long flags,
int pc)
{
struct ring_buffer_event *event;
struct ftrace_ret_entry *entry;
struct ftrace_graph_entry *entry;
unsigned long irq_flags;
if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled))))
@@ -1177,8 +1177,8 @@ function_trace_call(unsigned long ip, unsigned long parent_ip)
local_irq_restore(flags);
}
#ifdef CONFIG_FUNCTION_RET_TRACER
void trace_function_return(struct ftrace_retfunc *trace)
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
void trace_function_graph(struct ftrace_graph_ret *trace)
{
struct trace_array *tr = &global_trace;
struct trace_array_cpu *data;
@@ -1193,12 +1193,12 @@ void trace_function_return(struct ftrace_retfunc *trace)
disabled = atomic_inc_return(&data->disabled);
if (likely(disabled == 1)) {
pc = preempt_count();
__trace_function_return(tr, data, trace, flags, pc);
__trace_function_graph(tr, data, trace, flags, pc);
}
atomic_dec(&data->disabled);
raw_local_irq_restore(flags);
}
#endif /* CONFIG_FUNCTION_RET_TRACER */
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
static struct ftrace_ops trace_ops __read_mostly =
{
@@ -2001,7 +2001,7 @@ static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
break;
}
case TRACE_FN_RET: {
return print_return_function(iter);
return print_graph_function(iter);
break;
}
case TRACE_BRANCH: {

12
kernel/trace/trace.h
View File

@@ -57,7 +57,7 @@ struct ftrace_entry {
};
/* Function return entry */
struct ftrace_ret_entry {
struct ftrace_graph_entry {
struct trace_entry ent;
unsigned long ip;
unsigned long parent_ip;
@@ -264,7 +264,7 @@ extern void __ftrace_bad_type(void);
IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\
IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\
IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
IF_ASSIGN(var, ent, struct ftrace_ret_entry, TRACE_FN_RET);\
IF_ASSIGN(var, ent, struct ftrace_graph_entry, TRACE_FN_RET);\
IF_ASSIGN(var, ent, struct bts_entry, TRACE_BTS);\
__ftrace_bad_type(); \
} while (0)
@@ -398,7 +398,7 @@ void trace_function(struct trace_array *tr,
unsigned long parent_ip,
unsigned long flags, int pc);
void
trace_function_return(struct ftrace_retfunc *trace);
trace_function_graph(struct ftrace_graph_ret *trace);
void trace_bts(struct trace_array *tr,
unsigned long from,
@@ -489,11 +489,11 @@ extern int trace_vprintk(unsigned long ip, const char *fmt, va_list args);
extern unsigned long trace_flags;
/* Standard output formatting function used for function return traces */
#ifdef CONFIG_FUNCTION_RET_TRACER
extern enum print_line_t print_return_function(struct trace_iterator *iter);
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
extern enum print_line_t print_graph_function(struct trace_iterator *iter);
#else
static inline enum print_line_t
print_return_function(struct trace_iterator *iter)
print_graph_function(struct trace_iterator *iter)
{
return TRACE_TYPE_UNHANDLED;
}

98
kernel/trace/trace_functions_graph.c Normal file
View File

@@ -0,0 +1,98 @@
/*
*
* Function graph tracer.
* Copyright (c) 2008 Frederic Weisbecker <fweisbec@gmail.com>
* Mostly borrowed from function tracer which
* is Copyright (c) Steven Rostedt <srostedt@redhat.com>
*
*/
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/ftrace.h>
#include <linux/fs.h>
#include "trace.h"
#define TRACE_GRAPH_PRINT_OVERRUN 0x1
static struct tracer_opt trace_opts[] = {
/* Display overruns or not */
{ TRACER_OPT(overrun, TRACE_GRAPH_PRINT_OVERRUN) },
{ } /* Empty entry */
};
static struct tracer_flags tracer_flags = {
.val = 0, /* Don't display overruns by default */
.opts = trace_opts
};
static int graph_trace_init(struct trace_array *tr)
{
int cpu;
for_each_online_cpu(cpu)
tracing_reset(tr, cpu);
return register_ftrace_graph(&trace_function_graph);
}
static void graph_trace_reset(struct trace_array *tr)
{
unregister_ftrace_graph();
}
enum print_line_t
print_graph_function(struct trace_iterator *iter)
{
struct trace_seq *s = &iter->seq;
struct trace_entry *entry = iter->ent;
struct ftrace_graph_entry *field;
int ret;
if (entry->type == TRACE_FN_RET) {
trace_assign_type(field, entry);
ret = trace_seq_printf(s, "%pF -> ", (void *)field->parent_ip);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
ret = seq_print_ip_sym(s, field->ip,
trace_flags & TRACE_ITER_SYM_MASK);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
ret = trace_seq_printf(s, " (%llu ns)",
field->rettime - field->calltime);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERRUN) {
ret = trace_seq_printf(s, " (Overruns: %lu)",
field->overrun);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
}
ret = trace_seq_printf(s, "\n");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
return TRACE_TYPE_HANDLED;
}
return TRACE_TYPE_UNHANDLED;
}
static struct tracer graph_trace __read_mostly = {
.name = "function-graph",
.init = graph_trace_init,
.reset = graph_trace_reset,
.print_line = print_graph_function,
.flags = &tracer_flags,
};
static __init int init_graph_trace(void)
{
return register_tracer(&graph_trace);
}
device_initcall(init_graph_trace);