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/*
* unlikely profiler
*
* Copyright (C) 2008 Steven Rostedt <srostedt@redhat.com>
*/
#include <linux/kallsyms.h>
#include <linux/seq_file.h>
#include <linux/spinlock.h>
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/module.h>
#include <linux/ftrace.h>
#include <linux/hash.h>
#include <linux/fs.h>
#include <asm/local.h>
#include "trace.h"
void ftrace_likely_update(struct ftrace_likely_data *f, int val, int expect)
{
/* FIXME: Make this atomic! */
if (val == expect)
f->correct++;
else
f->incorrect++;
}
EXPORT_SYMBOL(ftrace_likely_update);
struct ftrace_pointer {
void *start;
void *stop;
};
static void *
t_next(struct seq_file *m, void *v, loff_t *pos)
{
struct ftrace_pointer *f = m->private;
struct ftrace_likely_data *p = v;
(*pos)++;
if (v == (void *)1)
return f->start;
++p;
if ((void *)p >= (void *)f->stop)
return NULL;
return p;
}
static void *t_start(struct seq_file *m, loff_t *pos)
{
void *t = (void *)1;
loff_t l = 0;
for (; t && l < *pos; t = t_next(m, t, &l))
;
return t;
}
static void t_stop(struct seq_file *m, void *p)
{
}
static int t_show(struct seq_file *m, void *v)
{
struct ftrace_likely_data *p = v;
const char *f;
unsigned long percent;
if (v == (void *)1) {
seq_printf(m, " correct incorrect %% "
" Function "
" File Line\n"
" ------- --------- - "
" -------- "
" ---- ----\n");
return 0;
}
/* Only print the file, not the path */
f = p->file + strlen(p->file);
while (f >= p->file && *f != '/')
f--;
f++;
if (p->correct) {
percent = p->incorrect * 100;
percent /= p->correct + p->incorrect;
} else
percent = p->incorrect ? 100 : 0;
seq_printf(m, "%8lu %8lu %3lu ", p->correct, p->incorrect, percent);
seq_printf(m, "%-30.30s %-20.20s %d\n", p->func, f, p->line);
return 0;
}
static struct seq_operations tracing_likely_seq_ops = {
.start = t_start,
.next = t_next,
.stop = t_stop,
.show = t_show,
};
static int tracing_likely_open(struct inode *inode, struct file *file)
{
int ret;
ret = seq_open(file, &tracing_likely_seq_ops);
if (!ret) {
struct seq_file *m = file->private_data;
m->private = (void *)inode->i_private;
}
return ret;
}
static struct file_operations tracing_likely_fops = {
.open = tracing_likely_open,
.read = seq_read,
.llseek = seq_lseek,
};
extern unsigned long __start_likely_profile[];
extern unsigned long __stop_likely_profile[];
extern unsigned long __start_unlikely_profile[];
extern unsigned long __stop_unlikely_profile[];
static struct ftrace_pointer ftrace_likely_pos = {
.start = __start_likely_profile,
.stop = __stop_likely_profile,
};
static struct ftrace_pointer ftrace_unlikely_pos = {
.start = __start_unlikely_profile,
.stop = __stop_unlikely_profile,
};
static __init int ftrace_unlikely_init(void)
{
struct dentry *d_tracer;
struct dentry *entry;
d_tracer = tracing_init_dentry();
entry = debugfs_create_file("profile_likely", 0444, d_tracer,
&ftrace_likely_pos,
&tracing_likely_fops);
if (!entry)
pr_warning("Could not create debugfs 'profile_likely' entry\n");
entry = debugfs_create_file("profile_unlikely", 0444, d_tracer,
&ftrace_unlikely_pos,
&tracing_likely_fops);
if (!entry)
pr_warning("Could not create debugfs"
" 'profile_unlikely' entry\n");
return 0;
}
device_initcall(ftrace_unlikely_init);
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