#include <linux/kallsyms.h>
#include <linux/seq_file.h>
#include <linux/spinlock.h>
+#include <linux/irqflags.h>
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/module.h>
#include <linux/hash.h>
#include <linux/fs.h>
#include <asm/local.h>
+
#include "trace.h"
+#include "trace_stat.h"
+#include "trace_output.h"
#ifdef CONFIG_BRANCH_TRACER
+static struct tracer branch_trace;
static int branch_tracing_enabled __read_mostly;
static DEFINE_MUTEX(branch_tracing_mutex);
+
static struct trace_array *branch_tracer;
static void
probe_likely_condition(struct ftrace_branch_data *f, int val, int expect)
{
+ struct ftrace_event_call *call = &event_branch;
struct trace_array *tr = branch_tracer;
struct ring_buffer_event *event;
struct trace_branch *entry;
- unsigned long flags, irq_flags;
+ struct ring_buffer *buffer;
+ unsigned long flags;
int cpu, pc;
const char *p;
if (atomic_inc_return(&tr->data[cpu]->disabled) != 1)
goto out;
- event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
- &irq_flags);
+ pc = preempt_count();
+ buffer = tr->buffer;
+ event = trace_buffer_lock_reserve(buffer, TRACE_BRANCH,
+ sizeof(*entry), flags, pc);
if (!event)
goto out;
- pc = preempt_count();
entry = ring_buffer_event_data(event);
- tracing_generic_entry_update(&entry->ent, flags, pc);
- entry->ent.type = TRACE_BRANCH;
/* Strip off the path, only save the file */
p = f->file + strlen(f->file);
entry->line = f->line;
entry->correct = val == expect;
- ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+ if (!filter_check_discard(call, entry, buffer, event))
+ ring_buffer_unlock_commit(buffer, event);
out:
atomic_dec(&tr->data[cpu]->disabled);
int enable_branch_tracing(struct trace_array *tr)
{
- int ret = 0;
-
mutex_lock(&branch_tracing_mutex);
branch_tracer = tr;
/*
branch_tracing_enabled++;
mutex_unlock(&branch_tracing_mutex);
- return ret;
+ return 0;
}
void disable_branch_tracing(void)
static int branch_trace_init(struct trace_array *tr)
{
- int cpu;
-
- for_each_online_cpu(cpu)
- tracing_reset(tr, cpu);
-
start_branch_trace(tr);
return 0;
}
stop_branch_trace(tr);
}
-struct tracer branch_trace __read_mostly =
+static enum print_line_t trace_branch_print(struct trace_iterator *iter,
+ int flags)
+{
+ struct trace_branch *field;
+
+ trace_assign_type(field, iter->ent);
+
+ if (trace_seq_printf(&iter->seq, "[%s] %s:%s:%d\n",
+ field->correct ? " ok " : " MISS ",
+ field->func,
+ field->file,
+ field->line))
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ return TRACE_TYPE_HANDLED;
+}
+
+static void branch_print_header(struct seq_file *s)
+{
+ seq_puts(s, "# TASK-PID CPU# TIMESTAMP CORRECT"
+ " FUNC:FILE:LINE\n");
+ seq_puts(s, "# | | | | | "
+ " |\n");
+}
+
+static struct trace_event trace_branch_event = {
+ .type = TRACE_BRANCH,
+ .trace = trace_branch_print,
+};
+
+static struct tracer branch_trace __read_mostly =
{
.name = "branch",
.init = branch_trace_init,
.reset = branch_trace_reset,
#ifdef CONFIG_FTRACE_SELFTEST
.selftest = trace_selftest_startup_branch,
-#endif
+#endif /* CONFIG_FTRACE_SELFTEST */
+ .print_header = branch_print_header,
};
-__init static int init_branch_trace(void)
+__init static int init_branch_tracer(void)
{
+ int ret;
+
+ ret = register_ftrace_event(&trace_branch_event);
+ if (!ret) {
+ printk(KERN_WARNING "Warning: could not register "
+ "branch events\n");
+ return 1;
+ }
return register_tracer(&branch_trace);
}
+device_initcall(init_branch_tracer);
-device_initcall(init_branch_trace);
#else
static inline
void trace_likely_condition(struct ftrace_branch_data *f, int val, int expect)
}
EXPORT_SYMBOL(ftrace_likely_update);
-struct ftrace_pointer {
- void *start;
- void *stop;
-};
+extern unsigned long __start_annotated_branch_profile[];
+extern unsigned long __stop_annotated_branch_profile[];
-static void *
-t_next(struct seq_file *m, void *v, loff_t *pos)
+static int annotated_branch_stat_headers(struct seq_file *m)
{
- struct ftrace_pointer *f = m->private;
- struct ftrace_branch_data *p = v;
-
- (*pos)++;
-
- if (v == (void *)1)
- return f->start;
-
- ++p;
-
- if ((void *)p >= (void *)f->stop)
- return NULL;
-
- return p;
+ seq_printf(m, " correct incorrect %% ");
+ seq_printf(m, " Function "
+ " File Line\n"
+ " ------- --------- - "
+ " -------- "
+ " ---- ----\n");
+ return 0;
}
-static void *t_start(struct seq_file *m, loff_t *pos)
+static inline long get_incorrect_percent(struct ftrace_branch_data *p)
{
- void *t = (void *)1;
- loff_t l = 0;
-
- for (; t && l < *pos; t = t_next(m, t, &l))
- ;
+ long percent;
- return t;
-}
+ if (p->correct) {
+ percent = p->incorrect * 100;
+ percent /= p->correct + p->incorrect;
+ } else
+ percent = p->incorrect ? 100 : -1;
-static void t_stop(struct seq_file *m, void *p)
-{
+ return percent;
}
-static int t_show(struct seq_file *m, void *v)
+static int branch_stat_show(struct seq_file *m, void *v)
{
struct ftrace_branch_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;
- }
+ long percent;
/* Only print the file, not the path */
f = p->file + strlen(p->file);
f--;
f++;
- if (p->correct) {
- percent = p->incorrect * 100;
- percent /= p->correct + p->incorrect;
- } else
- percent = p->incorrect ? 100 : 0;
+ /*
+ * The miss is overlayed on correct, and hit on incorrect.
+ */
+ percent = get_incorrect_percent(p);
- seq_printf(m, "%8lu %8lu %3lu ", p->correct, p->incorrect, percent);
+ seq_printf(m, "%8lu %8lu ", p->correct, p->incorrect);
+ if (percent < 0)
+ seq_printf(m, " X ");
+ else
+ seq_printf(m, "%3ld ", 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 void *annotated_branch_stat_start(struct tracer_stat *trace)
+{
+ return __start_annotated_branch_profile;
+}
+
+static void *
+annotated_branch_stat_next(void *v, int idx)
+{
+ struct ftrace_branch_data *p = v;
+
+ ++p;
+
+ if ((void *)p >= (void *)__stop_annotated_branch_profile)
+ return NULL;
+
+ return p;
+}
+
+static int annotated_branch_stat_cmp(void *p1, void *p2)
+{
+ struct ftrace_branch_data *a = p1;
+ struct ftrace_branch_data *b = p2;
+
+ long percent_a, percent_b;
+
+ percent_a = get_incorrect_percent(a);
+ percent_b = get_incorrect_percent(b);
+
+ if (percent_a < percent_b)
+ return -1;
+ if (percent_a > percent_b)
+ return 1;
+
+ if (a->incorrect < b->incorrect)
+ return -1;
+ if (a->incorrect > b->incorrect)
+ return 1;
+
+ /*
+ * Since the above shows worse (incorrect) cases
+ * first, we continue that by showing best (correct)
+ * cases last.
+ */
+ if (a->correct > b->correct)
+ return -1;
+ if (a->correct < b->correct)
+ return 1;
+
+ return 0;
+}
+
+static struct tracer_stat annotated_branch_stats = {
+ .name = "branch_annotated",
+ .stat_start = annotated_branch_stat_start,
+ .stat_next = annotated_branch_stat_next,
+ .stat_cmp = annotated_branch_stat_cmp,
+ .stat_headers = annotated_branch_stat_headers,
+ .stat_show = branch_stat_show
};
-static int tracing_likely_open(struct inode *inode, struct file *file)
+__init static int init_annotated_branch_stats(void)
{
int ret;
- ret = seq_open(file, &tracing_likely_seq_ops);
+ ret = register_stat_tracer(&annotated_branch_stats);
if (!ret) {
- struct seq_file *m = file->private_data;
- m->private = (void *)inode->i_private;
+ printk(KERN_WARNING "Warning: could not register "
+ "annotated branches stats\n");
+ return 1;
}
-
- return ret;
+ return 0;
}
+fs_initcall(init_annotated_branch_stats);
-static struct file_operations tracing_likely_fops = {
- .open = tracing_likely_open,
- .read = seq_read,
- .llseek = seq_lseek,
-};
+#ifdef CONFIG_PROFILE_ALL_BRANCHES
-extern unsigned long __start_likely_profile[];
-extern unsigned long __stop_likely_profile[];
-extern unsigned long __start_unlikely_profile[];
-extern unsigned long __stop_unlikely_profile[];
+extern unsigned long __start_branch_profile[];
+extern unsigned long __stop_branch_profile[];
-static struct ftrace_pointer ftrace_likely_pos = {
- .start = __start_likely_profile,
- .stop = __stop_likely_profile,
-};
+static int all_branch_stat_headers(struct seq_file *m)
+{
+ seq_printf(m, " miss hit %% ");
+ seq_printf(m, " Function "
+ " File Line\n"
+ " ------- --------- - "
+ " -------- "
+ " ---- ----\n");
+ return 0;
+}
-static struct ftrace_pointer ftrace_unlikely_pos = {
- .start = __start_unlikely_profile,
- .stop = __stop_unlikely_profile,
-};
+static void *all_branch_stat_start(struct tracer_stat *trace)
+{
+ return __start_branch_profile;
+}
-static __init int ftrace_branch_init(void)
+static void *
+all_branch_stat_next(void *v, int idx)
{
- struct dentry *d_tracer;
- struct dentry *entry;
+ struct ftrace_branch_data *p = v;
+
+ ++p;
- d_tracer = tracing_init_dentry();
+ if ((void *)p >= (void *)__stop_branch_profile)
+ return NULL;
+
+ return p;
+}
- 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");
+static struct tracer_stat all_branch_stats = {
+ .name = "branch_all",
+ .stat_start = all_branch_stat_start,
+ .stat_next = all_branch_stat_next,
+ .stat_headers = all_branch_stat_headers,
+ .stat_show = branch_stat_show
+};
- 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");
+__init static int all_annotated_branch_stats(void)
+{
+ int ret;
+ ret = register_stat_tracer(&all_branch_stats);
+ if (!ret) {
+ printk(KERN_WARNING "Warning: could not register "
+ "all branches stats\n");
+ return 1;
+ }
return 0;
}
-
-device_initcall(ftrace_branch_init);
+fs_initcall(all_annotated_branch_stats);
+#endif /* CONFIG_PROFILE_ALL_BRANCHES */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff