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authorIngo Molnar <mingo@elte.hu>2009-02-25 12:50:07 +0100
committerIngo Molnar <mingo@elte.hu>2009-02-25 12:50:07 +0100
commit2b1b858f690d6369a59ad241335eeedec6eb0c8c (patch)
tree91838f66d8ef6bb42fe66849c5cbd05650d272a3
parent886b5b73d71e4027d7dc6c14f5f7ab102201ea6b (diff)
parent1473e4417c79f12d91ef91a469699bfa911f510f (diff)
Merge branch 'tip/tracing/ftrace' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into tracing/ftrace
-rw-r--r--include/asm-generic/vmlinux.lds.h11
-rw-r--r--include/linux/tracepoint.h3
-rw-r--r--include/trace/sched.h49
-rw-r--r--include/trace/sched_event_types.h72
-rw-r--r--kernel/trace/Kconfig9
-rw-r--r--kernel/trace/Makefile2
-rw-r--r--kernel/trace/events.c13
-rw-r--r--kernel/trace/trace_events.c407
-rw-r--r--kernel/trace/trace_events.h55
9 files changed, 572 insertions, 49 deletions
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index c61fab1dd2f..0add6b28c36 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -61,6 +61,14 @@
#define BRANCH_PROFILE()
#endif
+#ifdef CONFIG_EVENT_TRACER
+#define FTRACE_EVENTS() VMLINUX_SYMBOL(__start_ftrace_events) = .; \
+ *(_ftrace_events) \
+ VMLINUX_SYMBOL(__stop_ftrace_events) = .;
+#else
+#define FTRACE_EVENTS()
+#endif
+
/* .data section */
#define DATA_DATA \
*(.data) \
@@ -81,7 +89,8 @@
*(__tracepoints) \
VMLINUX_SYMBOL(__stop___tracepoints) = .; \
LIKELY_PROFILE() \
- BRANCH_PROFILE()
+ BRANCH_PROFILE() \
+ FTRACE_EVENTS()
#define RO_DATA(align) \
. = ALIGN((align)); \
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index 75700545836..34ae464efff 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -153,4 +153,7 @@ static inline void tracepoint_synchronize_unregister(void)
synchronize_sched();
}
+#define DEFINE_TRACE_FMT(name, proto, args, fmt) \
+ DECLARE_TRACE(name, TPPROTO(proto), TPARGS(args))
+
#endif
diff --git a/include/trace/sched.h b/include/trace/sched.h
index 0d81098ee9f..4e372a1a29b 100644
--- a/include/trace/sched.h
+++ b/include/trace/sched.h
@@ -4,53 +4,6 @@
#include <linux/sched.h>
#include <linux/tracepoint.h>
-DECLARE_TRACE(sched_kthread_stop,
- TPPROTO(struct task_struct *t),
- TPARGS(t));
-
-DECLARE_TRACE(sched_kthread_stop_ret,
- TPPROTO(int ret),
- TPARGS(ret));
-
-DECLARE_TRACE(sched_wait_task,
- TPPROTO(struct rq *rq, struct task_struct *p),
- TPARGS(rq, p));
-
-DECLARE_TRACE(sched_wakeup,
- TPPROTO(struct rq *rq, struct task_struct *p, int success),
- TPARGS(rq, p, success));
-
-DECLARE_TRACE(sched_wakeup_new,
- TPPROTO(struct rq *rq, struct task_struct *p, int success),
- TPARGS(rq, p, success));
-
-DECLARE_TRACE(sched_switch,
- TPPROTO(struct rq *rq, struct task_struct *prev,
- struct task_struct *next),
- TPARGS(rq, prev, next));
-
-DECLARE_TRACE(sched_migrate_task,
- TPPROTO(struct task_struct *p, int orig_cpu, int dest_cpu),
- TPARGS(p, orig_cpu, dest_cpu));
-
-DECLARE_TRACE(sched_process_free,
- TPPROTO(struct task_struct *p),
- TPARGS(p));
-
-DECLARE_TRACE(sched_process_exit,
- TPPROTO(struct task_struct *p),
- TPARGS(p));
-
-DECLARE_TRACE(sched_process_wait,
- TPPROTO(struct pid *pid),
- TPARGS(pid));
-
-DECLARE_TRACE(sched_process_fork,
- TPPROTO(struct task_struct *parent, struct task_struct *child),
- TPARGS(parent, child));
-
-DECLARE_TRACE(sched_signal_send,
- TPPROTO(int sig, struct task_struct *p),
- TPARGS(sig, p));
+#include <trace/sched_event_types.h>
#endif
diff --git a/include/trace/sched_event_types.h b/include/trace/sched_event_types.h
new file mode 100644
index 00000000000..a4f662940f4
--- /dev/null
+++ b/include/trace/sched_event_types.h
@@ -0,0 +1,72 @@
+
+/* use <trace/sched.h> instead */
+#ifndef DEFINE_TRACE_FMT
+# error Do not include this file directly.
+# error Unless you know what you are doing.
+#endif
+
+DEFINE_TRACE_FMT(sched_kthread_stop,
+ TPPROTO(struct task_struct *t),
+ TPARGS(t),
+ TPFMT("task %s:%d", t->comm, t->pid));
+
+DEFINE_TRACE_FMT(sched_kthread_stop_ret,
+ TPPROTO(int ret),
+ TPARGS(ret),
+ TPFMT("ret=%d", ret));
+
+DEFINE_TRACE_FMT(sched_wait_task,
+ TPPROTO(struct rq *rq, struct task_struct *p),
+ TPARGS(rq, p),
+ TPFMT("task %s:%d", p->comm, p->pid));
+
+DEFINE_TRACE_FMT(sched_wakeup,
+ TPPROTO(struct rq *rq, struct task_struct *p, int success),
+ TPARGS(rq, p, success),
+ TPFMT("task %s:%d %s",
+ p->comm, p->pid, success?"succeeded":"failed"));
+
+DEFINE_TRACE_FMT(sched_wakeup_new,
+ TPPROTO(struct rq *rq, struct task_struct *p, int success),
+ TPARGS(rq, p, success),
+ TPFMT("task %s:%d",
+ p->comm, p->pid, success?"succeeded":"failed"));
+
+DEFINE_TRACE_FMT(sched_switch,
+ TPPROTO(struct rq *rq, struct task_struct *prev,
+ struct task_struct *next),
+ TPARGS(rq, prev, next),
+ TPFMT("task %s:%d ==> %s:%d",
+ prev->comm, prev->pid, next->comm, next->pid));
+
+DEFINE_TRACE_FMT(sched_migrate_task,
+ TPPROTO(struct task_struct *p, int orig_cpu, int dest_cpu),
+ TPARGS(p, orig_cpu, dest_cpu),
+ TPFMT("task %s:%d from: %d to: %d",
+ p->comm, p->pid, orig_cpu, dest_cpu));
+
+DEFINE_TRACE_FMT(sched_process_free,
+ TPPROTO(struct task_struct *p),
+ TPARGS(p),
+ TPFMT("task %s:%d", p->comm, p->pid));
+
+DEFINE_TRACE_FMT(sched_process_exit,
+ TPPROTO(struct task_struct *p),
+ TPARGS(p),
+ TPFMT("task %s:%d", p->comm, p->pid));
+
+DEFINE_TRACE_FMT(sched_process_wait,
+ TPPROTO(struct pid *pid),
+ TPARGS(pid),
+ TPFMT("pid %d", pid));
+
+DEFINE_TRACE_FMT(sched_process_fork,
+ TPPROTO(struct task_struct *parent, struct task_struct *child),
+ TPARGS(parent, child),
+ TPFMT("parent %s:%d child %s:%d",
+ parent->comm, parent->pid, child->comm, child->pid));
+
+DEFINE_TRACE_FMT(sched_signal_send,
+ TPPROTO(int sig, struct task_struct *p),
+ TPARGS(sig, p),
+ TPFMT("sig: %d task %s:%d", sig, p->comm, p->pid));
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 07877f4b523..999c6a2485d 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -159,6 +159,15 @@ config CONTEXT_SWITCH_TRACER
This tracer gets called from the context switch and records
all switching of tasks.
+config EVENT_TRACER
+ bool "Trace various events in the kernel"
+ depends on DEBUG_KERNEL
+ select TRACING
+ help
+ This tracer hooks to various trace points in the kernel
+ allowing the user to pick and choose which trace point they
+ want to trace.
+
config BOOT_TRACER
bool "Trace boot initcalls"
depends on DEBUG_KERNEL
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 627090bc262..664b6c0dc75 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -38,5 +38,7 @@ obj-$(CONFIG_POWER_TRACER) += trace_power.o
obj-$(CONFIG_KMEMTRACE) += kmemtrace.o
obj-$(CONFIG_WORKQUEUE_TRACER) += trace_workqueue.o
obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
+obj-$(CONFIG_EVENT_TRACER) += trace_events.o
+obj-$(CONFIG_EVENT_TRACER) += events.o
libftrace-y := ftrace.o
diff --git a/kernel/trace/events.c b/kernel/trace/events.c
new file mode 100644
index 00000000000..38c89eef99e
--- /dev/null
+++ b/kernel/trace/events.c
@@ -0,0 +1,13 @@
+/*
+ * This is the place to register all trace points as events.
+ * Include the trace/<type>.h at the top.
+ * Include the trace/<type>_event_types.h at the bottom.
+ */
+
+/* trace/<type>.h here */
+#include <trace/sched.h>
+
+#include "trace_events.h"
+
+/* trace/<type>_event_types.h here */
+#include <trace/sched_event_types.h>
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
new file mode 100644
index 00000000000..3bcb9df9334
--- /dev/null
+++ b/kernel/trace/trace_events.c
@@ -0,0 +1,407 @@
+/*
+ * event tracer
+ *
+ * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ *
+ */
+
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+#include <linux/module.h>
+#include <linux/ctype.h>
+
+#include "trace_events.h"
+
+#define events_for_each(event) \
+ for (event = __start_ftrace_events; \
+ (unsigned long)event < (unsigned long)__stop_ftrace_events; \
+ event++)
+
+void event_trace_printk(unsigned long ip, const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ tracing_record_cmdline(current);
+ trace_vprintk(ip, task_curr_ret_stack(current), fmt, ap);
+ va_end(ap);
+}
+
+static void ftrace_clear_events(void)
+{
+ struct ftrace_event_call *call = (void *)__start_ftrace_events;
+
+
+ while ((unsigned long)call < (unsigned long)__stop_ftrace_events) {
+
+ if (call->enabled) {
+ call->enabled = 0;
+ call->unregfunc();
+ }
+ call++;
+ }
+}
+
+static int ftrace_set_clr_event(char *buf, int set)
+{
+ struct ftrace_event_call *call = __start_ftrace_events;
+
+
+ events_for_each(call) {
+
+ if (!call->name)
+ continue;
+
+ if (strcmp(buf, call->name) != 0)
+ continue;
+
+ if (set) {
+ /* Already set? */
+ if (call->enabled)
+ return 0;
+ call->enabled = 1;
+ call->regfunc();
+ } else {
+ /* Already cleared? */
+ if (!call->enabled)
+ return 0;
+ call->enabled = 0;
+ call->unregfunc();
+ }
+ return 0;
+ }
+ return -EINVAL;
+}
+
+/* 128 should be much more than enough */
+#define EVENT_BUF_SIZE 127
+
+static ssize_t
+ftrace_event_write(struct file *file, const char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
+ size_t read = 0;
+ int i, set = 1;
+ ssize_t ret;
+ char *buf;
+ char ch;
+
+ if (!cnt || cnt < 0)
+ return 0;
+
+ ret = get_user(ch, ubuf++);
+ if (ret)
+ return ret;
+ read++;
+ cnt--;
+
+ /* skip white space */
+ while (cnt && isspace(ch)) {
+ ret = get_user(ch, ubuf++);
+ if (ret)
+ return ret;
+ read++;
+ cnt--;
+ }
+
+ /* Only white space found? */
+ if (isspace(ch)) {
+ file->f_pos += read;
+ ret = read;
+ return ret;
+ }
+
+ buf = kmalloc(EVENT_BUF_SIZE+1, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ if (cnt > EVENT_BUF_SIZE)
+ cnt = EVENT_BUF_SIZE;
+
+ i = 0;
+ while (cnt && !isspace(ch)) {
+ if (!i && ch == '!')
+ set = 0;
+ else
+ buf[i++] = ch;
+
+ ret = get_user(ch, ubuf++);
+ if (ret)
+ goto out_free;
+ read++;
+ cnt--;
+ }
+ buf[i] = 0;
+
+ file->f_pos += read;
+
+ ret = ftrace_set_clr_event(buf, set);
+ if (ret)
+ goto out_free;
+
+ ret = read;
+
+ out_free:
+ kfree(buf);
+
+ return ret;
+}
+
+static void *
+t_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ struct ftrace_event_call *call = m->private;
+ struct ftrace_event_call *next = call;
+
+ (*pos)++;
+
+ if ((unsigned long)call >= (unsigned long)__stop_ftrace_events)
+ return NULL;
+
+ m->private = ++next;
+
+ return call;
+}
+
+static void *t_start(struct seq_file *m, loff_t *pos)
+{
+ return t_next(m, NULL, pos);
+}
+
+static void *
+s_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ struct ftrace_event_call *call = m->private;
+ struct ftrace_event_call *next;
+
+ (*pos)++;
+
+ retry:
+ if ((unsigned long)call >= (unsigned long)__stop_ftrace_events)
+ return NULL;
+
+ if (!call->enabled) {
+ call++;
+ goto retry;
+ }
+
+ next = call;
+ m->private = ++next;
+
+ return call;
+}
+
+static void *s_start(struct seq_file *m, loff_t *pos)
+{
+ return s_next(m, NULL, pos);
+}
+
+static int t_show(struct seq_file *m, void *v)
+{
+ struct ftrace_event_call *call = v;
+
+ seq_printf(m, "%s\n", call->name);
+
+ return 0;
+}
+
+static void t_stop(struct seq_file *m, void *p)
+{
+}
+
+static int
+ftrace_event_seq_open(struct inode *inode, struct file *file)
+{
+ int ret;
+ const struct seq_operations *seq_ops;
+
+ if ((file->f_mode & FMODE_WRITE) &&
+ !(file->f_flags & O_APPEND))
+ ftrace_clear_events();
+
+ seq_ops = inode->i_private;
+ ret = seq_open(file, seq_ops);
+ if (!ret) {
+ struct seq_file *m = file->private_data;
+
+ m->private = __start_ftrace_events;
+ }
+ return ret;
+}
+
+static ssize_t
+event_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
+ loff_t *ppos)
+{
+ struct ftrace_event_call *call = filp->private_data;
+ char *buf;
+
+ if (call->enabled)
+ buf = "1\n";
+ else
+ buf = "0\n";
+
+ return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
+}
+
+static ssize_t
+event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
+ loff_t *ppos)
+{
+ struct ftrace_event_call *call = filp->private_data;
+ char buf[64];
+ unsigned long val;
+ int ret;
+
+ if (cnt >= sizeof(buf))
+ return -EINVAL;
+
+ if (copy_from_user(&buf, ubuf, cnt))
+ return -EFAULT;
+
+ buf[cnt] = 0;
+
+ ret = strict_strtoul(buf, 10, &val);
+ if (ret < 0)
+ return ret;
+
+ switch (val) {
+ case 0:
+ if (!call->enabled)
+ break;
+
+ call->enabled = 0;
+ call->unregfunc();
+ break;
+ case 1:
+ if (call->enabled)
+ break;
+
+ call->enabled = 1;
+ call->regfunc();
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ *ppos += cnt;
+
+ return cnt;
+}
+
+static const struct seq_operations show_event_seq_ops = {
+ .start = t_start,
+ .next = t_next,
+ .show = t_show,
+ .stop = t_stop,
+};
+
+static const struct seq_operations show_set_event_seq_ops = {
+ .start = s_start,
+ .next = s_next,
+ .show = t_show,
+ .stop = t_stop,
+};
+
+static const struct file_operations ftrace_avail_fops = {
+ .open = ftrace_event_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+static const struct file_operations ftrace_set_event_fops = {
+ .open = ftrace_event_seq_open,
+ .read = seq_read,
+ .write = ftrace_event_write,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+static const struct file_operations ftrace_enable_fops = {
+ .open = tracing_open_generic,
+ .read = event_enable_read,
+ .write = event_enable_write,
+};
+
+static struct dentry *event_trace_events_dir(void)
+{
+ static struct dentry *d_tracer;
+ static struct dentry *d_events;
+
+ if (d_events)
+ return d_events;
+
+ d_tracer = tracing_init_dentry();
+ if (!d_tracer)
+ return NULL;
+
+ d_events = debugfs_create_dir("events", d_tracer);
+ if (!d_events)
+ pr_warning("Could not create debugfs "
+ "'events' directory\n");
+
+ return d_events;
+}
+
+static int
+event_create_dir(struct ftrace_event_call *call, struct dentry *d_events)
+{
+ struct dentry *entry;
+
+ call->dir = debugfs_create_dir(call->name, d_events);
+ if (!call->dir) {
+ pr_warning("Could not create debugfs "
+ "'%s' directory\n", call->name);
+ return -1;
+ }
+
+ entry = debugfs_create_file("enable", 0644, call->dir, call,
+ &ftrace_enable_fops);
+ if (!entry)
+ pr_warning("Could not create debugfs "
+ "'%s/enable' entry\n", call->name);
+
+ return 0;
+}
+
+static __init int event_trace_init(void)
+{
+ struct ftrace_event_call *call = __start_ftrace_events;
+ struct dentry *d_tracer;
+ struct dentry *entry;
+ struct dentry *d_events;
+
+ d_tracer = tracing_init_dentry();
+ if (!d_tracer)
+ return 0;
+
+ entry = debugfs_create_file("available_events", 0444, d_tracer,
+ (void *)&show_event_seq_ops,
+ &ftrace_avail_fops);
+ if (!entry)
+ pr_warning("Could not create debugfs "
+ "'available_events' entry\n");
+
+ entry = debugfs_create_file("set_event", 0644, d_tracer,
+ (void *)&show_set_event_seq_ops,
+ &ftrace_set_event_fops);
+ if (!entry)
+ pr_warning("Could not create debugfs "
+ "'set_event' entry\n");
+
+ d_events = event_trace_events_dir();
+ if (!d_events)
+ return 0;
+
+ events_for_each(call) {
+ /* The linker may leave blanks */
+ if (!call->name)
+ continue;
+ event_create_dir(call, d_events);
+ }
+
+ return 0;
+}
+fs_initcall(event_trace_init);
diff --git a/kernel/trace/trace_events.h b/kernel/trace/trace_events.h
new file mode 100644
index 00000000000..cb8455b3ac9
--- /dev/null
+++ b/kernel/trace/trace_events.h
@@ -0,0 +1,55 @@
+#ifndef _LINUX_KERNEL_TRACE_EVENTS_H
+#define _LINUX_KERNEL_TRACE_EVENTS_H
+
+#include <linux/debugfs.h>
+#include <linux/ftrace.h>
+#include "trace.h"
+
+struct ftrace_event_call {
+ char *name;
+ struct dentry *dir;
+ int enabled;
+ int (*regfunc)(void);
+ void (*unregfunc)(void);
+};
+
+
+#undef TPFMT
+#define TPFMT(fmt, args...) fmt "\n", ##args
+
+#undef DEFINE_TRACE_FMT
+#define DEFINE_TRACE_FMT(call, proto, args, fmt) \
+static void ftrace_event_##call(proto) \
+{ \
+ event_trace_printk(_RET_IP_, "(" #call ") " fmt); \
+} \
+ \
+static int ftrace_reg_event_##call(void) \
+{ \
+ int ret; \
+ \
+ ret = register_trace_##call(ftrace_event_##call); \
+ if (!ret) \
+ pr_info("event trace: Could not activate trace point " \
+ "probe to " #call); \
+ return ret; \
+} \
+ \
+static void ftrace_unreg_event_##call(void) \
+{ \
+ unregister_trace_##call(ftrace_event_##call); \
+} \
+ \
+static struct ftrace_event_call __used \
+__attribute__((__aligned__(4))) \
+__attribute__((section("_ftrace_events"))) event_##call = { \
+ .name = #call, \
+ .regfunc = ftrace_reg_event_##call, \
+ .unregfunc = ftrace_unreg_event_##call, \
+}
+
+void event_trace_printk(unsigned long ip, const char *fmt, ...);
+extern struct ftrace_event_call __start_ftrace_events[];
+extern struct ftrace_event_call __stop_ftrace_events[];
+
+#endif /* _LINUX_KERNEL_TRACE_EVENTS_H */