Skip to content

L
linux-davinci
Commit e2b8b280 authored by Ingo Molnar's avatar Ingo Molnar
Browse files
Options

Merge branch 'tip/tracing/ftrace' of... 

Merge branch 'tip/tracing/ftrace' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into tracing/ftrace
parents 4dd163a0 ef18012b
Show whitespace changes
Inline Side-by-side
Showing with 261 additions and 132 deletions
include/linux/tracepoint.h
View file @ e2b8b280
......@@ -157,7 +157,110 @@ static inline void tracepoint_synchronize_unregister(void)
#define TRACE_FORMAT(name, proto, args, fmt) \
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
#define TRACE_EVENT(name, proto, args, struct, print, assign) \
/*
* For use with the TRACE_EVENT macro:
*
* We define a tracepoint, its arguments, its printk format
* and its 'fast binay record' layout.
*
* Firstly, name your tracepoint via TRACE_EVENT(name : the
* 'subsystem_event' notation is fine.
*
* Think about this whole construct as the
* 'trace_sched_switch() function' from now on.
*
*
* TRACE_EVENT(sched_switch,
*
* *
* * A function has a regular function arguments
* * prototype, declare it via TP_PROTO():
* *
*
* TP_PROTO(struct rq *rq, struct task_struct *prev,
* struct task_struct *next),
*
* *
* * Define the call signature of the 'function'.
* * (Design sidenote: we use this instead of a
* * TP_PROTO1/TP_PROTO2/TP_PROTO3 ugliness.)
* *
*
* TP_ARGS(rq, prev, next),
*
* *
* * Fast binary tracing: define the trace record via
* * TP_STRUCT__entry(). You can think about it like a
* * regular C structure local variable definition.
* *
* * This is how the trace record is structured and will
* * be saved into the ring buffer. These are the fields
* * that will be exposed to user-space in
* * /debug/tracing/events/<*>/format.
* *
* * The declared 'local variable' is called '__entry'
* *
* * __field(pid_t, prev_prid) is equivalent to a standard declariton:
* *
* * pid_t prev_pid;
* *
* * __array(char, prev_comm, TASK_COMM_LEN) is equivalent to:
* *
* * char prev_comm[TASK_COMM_LEN];
* *
*
* TP_STRUCT__entry(
* __array( char, prev_comm, TASK_COMM_LEN )
* __field( pid_t, prev_pid )
* __field( int, prev_prio )
* __array( char, next_comm, TASK_COMM_LEN )
* __field( pid_t, next_pid )
* __field( int, next_prio )
* ),
*
* *
* * Assign the entry into the trace record, by embedding
* * a full C statement block into TP_fast_assign(). You
* * can refer to the trace record as '__entry' -
* * otherwise you can put arbitrary C code in here.
* *
* * Note: this C code will execute every time a trace event
* * happens, on an active tracepoint.
* *
*
* TP_fast_assign(
* memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN);
* __entry->prev_pid = prev->pid;
* __entry->prev_prio = prev->prio;
* memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN);
* __entry->next_pid = next->pid;
* __entry->next_prio = next->prio;
* )
*
* *
* * Formatted output of a trace record via TP_printk().
* * This is how the tracepoint will appear under ftrace
* * plugins that make use of this tracepoint.
* *
* * (raw-binary tracing wont actually perform this step.)
* *
*
* TP_printk("task %s:%d [%d] ==> %s:%d [%d]",
* __entry->prev_comm, __entry->prev_pid, __entry->prev_prio,
* __entry->next_comm, __entry->next_pid, __entry->next_prio),
*
* );
*
* This macro construct is thus used for the regular printk format
* tracing setup, it is used to construct a function pointer based
* tracepoint callback (this is used by programmatic plugins and
* can also by used by generic instrumentation like SystemTap), and
* it is also used to expose a structured trace record in
* /debug/tracing/events/.
*/
#define TRACE_EVENT(name, proto, args, struct, assign, print) \
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
#endif
include/trace/irq_event_types.h
View file @ e2b8b280
......@@ -31,13 +31,13 @@ TRACE_EVENT(irq_handler_exit,
__field( int, ret )
),
TP_printk("irq=%d return=%s",
__entry->irq, __entry->ret ? "handled" : "unhandled"),
TP_fast_assign(
__entry->irq = irq;
__entry->ret = ret;
)
),
TP_printk("irq=%d return=%s",
__entry->irq, __entry->ret ? "handled" : "unhandled")
);
#undef TRACE_SYSTEM
include/trace/sched_event_types.h
View file @ e2b8b280
......@@ -22,12 +22,12 @@ TRACE_EVENT(sched_kthread_stop,
__field( pid_t, pid )
),
TP_printk("task %s:%d", __entry->comm, __entry->pid),
TP_fast_assign(
memcpy(__entry->comm, t->comm, TASK_COMM_LEN);
__entry->pid = t->pid;
)
),
TP_printk("task %s:%d", __entry->comm, __entry->pid)
);
/*
......@@ -43,11 +43,11 @@ TRACE_EVENT(sched_kthread_stop_ret,
__field( int, ret )
),
TP_printk("ret %d", __entry->ret),
TP_fast_assign(
__entry->ret = ret;
)
),
TP_printk("ret %d", __entry->ret)
);
/*
......@@ -68,14 +68,14 @@ TRACE_EVENT(sched_wait_task,
__field( int, prio )
),
TP_printk("task %s:%d [%d]",
__entry->comm, __entry->pid, __entry->prio),
TP_fast_assign(
memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
__entry->pid = p->pid;
__entry->prio = p->prio;
)
),
TP_printk("task %s:%d [%d]",
__entry->comm, __entry->pid, __entry->prio)
);
/*
......@@ -97,16 +97,16 @@ TRACE_EVENT(sched_wakeup,
__field( int, success )
),
TP_printk("task %s:%d [%d] success=%d",
__entry->comm, __entry->pid, __entry->prio,
__entry->success),
TP_fast_assign(
memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
__entry->pid = p->pid;
__entry->prio = p->prio;
__entry->success = success;
)
),
TP_printk("task %s:%d [%d] success=%d",
__entry->comm, __entry->pid, __entry->prio,
__entry->success)
);
/*
......@@ -128,16 +128,16 @@ TRACE_EVENT(sched_wakeup_new,
__field( int, success )
),
TP_printk("task %s:%d [%d] success=%d",
__entry->comm, __entry->pid, __entry->prio,
__entry->success),
TP_fast_assign(
memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
__entry->pid = p->pid;
__entry->prio = p->prio;
__entry->success = success;
)
),
TP_printk("task %s:%d [%d] success=%d",
__entry->comm, __entry->pid, __entry->prio,
__entry->success)
);
/*
......@@ -162,10 +162,6 @@ TRACE_EVENT(sched_switch,
__field( int, next_prio )
),
TP_printk("task %s:%d [%d] ==> %s:%d [%d]",
__entry->prev_comm, __entry->prev_pid, __entry->prev_prio,
__entry->next_comm, __entry->next_pid, __entry->next_prio),
TP_fast_assign(
memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN);
__entry->prev_pid = prev->pid;
......@@ -173,7 +169,11 @@ TRACE_EVENT(sched_switch,
memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN);
__entry->next_pid = next->pid;
__entry->next_prio = next->prio;
)
),
TP_printk("task %s:%d [%d] ==> %s:%d [%d]",
__entry->prev_comm, __entry->prev_pid, __entry->prev_prio,
__entry->next_comm, __entry->next_pid, __entry->next_prio)
);
/*
......@@ -193,17 +193,17 @@ TRACE_EVENT(sched_migrate_task,
__field( int, dest_cpu )
),
TP_printk("task %s:%d [%d] from: %d to: %d",
__entry->comm, __entry->pid, __entry->prio,
__entry->orig_cpu, __entry->dest_cpu),
TP_fast_assign(
memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
__entry->pid = p->pid;
__entry->prio = p->prio;
__entry->orig_cpu = orig_cpu;
__entry->dest_cpu = dest_cpu;
)
),
TP_printk("task %s:%d [%d] from: %d to: %d",
__entry->comm, __entry->pid, __entry->prio,
__entry->orig_cpu, __entry->dest_cpu)
);
/*
......@@ -221,14 +221,14 @@ TRACE_EVENT(sched_process_free,
__field( int, prio )
),
TP_printk("task %s:%d [%d]",
__entry->comm, __entry->pid, __entry->prio),
TP_fast_assign(
memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
__entry->pid = p->pid;
__entry->prio = p->prio;
)
),
TP_printk("task %s:%d [%d]",
__entry->comm, __entry->pid, __entry->prio)
);
/*
......@@ -246,14 +246,14 @@ TRACE_EVENT(sched_process_exit,
__field( int, prio )
),
TP_printk("task %s:%d [%d]",
__entry->comm, __entry->pid, __entry->prio),
TP_fast_assign(
memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
__entry->pid = p->pid;
__entry->prio = p->prio;
)
),
TP_printk("task %s:%d [%d]",
__entry->comm, __entry->pid, __entry->prio)
);
/*
......@@ -271,14 +271,14 @@ TRACE_EVENT(sched_process_wait,
__field( int, prio )
),
TP_printk("task %s:%d [%d]",
__entry->comm, __entry->pid, __entry->prio),
TP_fast_assign(
memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
__entry->pid = pid_nr(pid);
__entry->prio = current->prio;
)
),
TP_printk("task %s:%d [%d]",
__entry->comm, __entry->pid, __entry->prio)
);
/*
......@@ -297,16 +297,16 @@ TRACE_EVENT(sched_process_fork,
__field( pid_t, child_pid )
),
TP_printk("parent %s:%d child %s:%d",
__entry->parent_comm, __entry->parent_pid,
__entry->child_comm, __entry->child_pid),
TP_fast_assign(
memcpy(__entry->parent_comm, parent->comm, TASK_COMM_LEN);
__entry->parent_pid = parent->pid;
memcpy(__entry->child_comm, child->comm, TASK_COMM_LEN);
__entry->child_pid = child->pid;
)
),
TP_printk("parent %s:%d child %s:%d",
__entry->parent_comm, __entry->parent_pid,
__entry->child_comm, __entry->child_pid)
);
/*
......@@ -324,14 +324,14 @@ TRACE_EVENT(sched_signal_send,
__field( pid_t, pid )
),
TP_printk("sig: %d task %s:%d",
__entry->sig, __entry->comm, __entry->pid),
TP_fast_assign(
memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
__entry->pid = p->pid;
__entry->sig = sig;
)
),
TP_printk("sig: %d task %s:%d",
__entry->sig, __entry->comm, __entry->pid)
);
#undef TRACE_SYSTEM
kernel/trace/trace_events.c
View file @ e2b8b280
......@@ -102,7 +102,7 @@ static int ftrace_set_clr_event(char *buf, int set)
mutex_lock(&event_mutex);
events_for_each(call) {
if (!call->name)
if (!call->name || !call->regfunc)
continue;
if (match &&
......@@ -207,9 +207,21 @@ t_next(struct seq_file *m, void *v, loff_t *pos)
(*pos)++;
for (;;) {
if ((unsigned long)call >= (unsigned long)__stop_ftrace_events)
return NULL;
/*
* The ftrace subsystem is for showing formats only.
* They can not be enabled or disabled via the event files.
*/
if (call->regfunc)
break;
call++;
next = call;
}
m->private = ++next;
return call;
......@@ -338,8 +350,7 @@ event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
#undef FIELD
#define FIELD(type, name) \
#type, #name, (unsigned int)offsetof(typeof(field), name), \
(unsigned int)sizeof(field.name)
#type, #name, offsetof(typeof(field), name), sizeof(field.name)
static int trace_write_header(struct trace_seq *s)
{
......@@ -347,11 +358,11 @@ static int trace_write_header(struct trace_seq *s)
/* struct trace_entry */
return trace_seq_printf(s,
"\tfield:%s %s;\toffset:%u;\tsize:%u;\n"
"\tfield:%s %s;\toffset:%u;\tsize:%u;\n"
"\tfield:%s %s;\toffset:%u;\tsize:%u;\n"
"\tfield:%s %s;\toffset:%u;\tsize:%u;\n"
"\tfield:%s %s;\toffset:%u;\tsize:%u;\n"
"\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
"\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
"\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
"\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
"\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
"\n",
FIELD(unsigned char, type),
FIELD(unsigned char, flags),
......@@ -417,6 +428,13 @@ static const struct seq_operations show_set_event_seq_ops = {
.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,
......@@ -558,6 +576,13 @@ static __init int event_trace_init(void)
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);
......
kernel/trace/trace_events_stage_1.h
View file @ e2b8b280
......@@ -6,11 +6,13 @@
* struct ftrace_raw_<call> {
* struct trace_entry ent;
* <type> <item>;
* <type2> <item2>[<len>];
* [...]
* };
*
* The <type> <item> is created by the TRACE_FIELD(type, item, assign)
* macro. We simply do "type item;", and that will create the fields
* The <type> <item> is created by the __field(type, item) macro or
* the __array(type2, item2, len) macro.
* We simply do "type item;", and that will create the fields
* in the structure.
*/
......@@ -27,7 +29,7 @@
#define TP_STRUCT__entry(args...) args
#undef TRACE_EVENT
#define TRACE_EVENT(name, proto, args, tstruct, print, assign) \
#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
struct ftrace_raw_##name { \
struct trace_entry ent; \
tstruct \
......
kernel/trace/trace_events_stage_2.h
View file @ e2b8b280
......@@ -20,7 +20,7 @@
*
* field = (typeof(field))entry;
*
* ret = trace_seq_printf(s, <TP_RAW_FMT> "%s", <ARGS> "\n");
* ret = trace_seq_printf(s, <TP_printk> "\n");
* if (!ret)
* return TRACE_TYPE_PARTIAL_LINE;
*
......@@ -39,7 +39,7 @@
#define TP_printk(fmt, args...) fmt "\n", args
#undef TRACE_EVENT
#define TRACE_EVENT(call, proto, args, tstruct, print, assign) \
#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
enum print_line_t \
ftrace_raw_output_##call(struct trace_iterator *iter, int flags) \
{ \
......@@ -76,10 +76,9 @@ ftrace_raw_output_##call(struct trace_iterator *iter, int flags) \
* int ret;
*
* ret = trace_seq_printf(s, #type " " #item ";"
* " size:%d; offset:%d;\n",
* sizeof(field.type),
* offsetof(struct ftrace_raw_##call,
* item));
* " offset:%u; size:%u;\n",
* offsetof(struct ftrace_raw_##call, item),
* sizeof(field.type));
*
* }
*/
......@@ -115,7 +114,7 @@ ftrace_raw_output_##call(struct trace_iterator *iter, int flags) \
#define TP_fast_assign(args...) args
#undef TRACE_EVENT
#define TRACE_EVENT(call, proto, args, tstruct, print, func) \
#define TRACE_EVENT(call, proto, args, tstruct, func, print) \
static int \
ftrace_format_##call(struct trace_seq *s) \
{ \
......
kernel/trace/trace_events_stage_3.h
View file @ e2b8b280
......@@ -56,7 +56,8 @@
* return;
* entry = ring_buffer_event_data(event);
*
* <tstruct>; <-- Here we assign the entries by the TRACE_FIELD.
* <assign>; <-- Here we assign the entries by the __field and
* __array macros.
*
* trace_current_buffer_unlock_commit(event, irq_flags, pc);
* }
......@@ -96,11 +97,10 @@
* __attribute__((__aligned__(4)))
* __attribute__((section("_ftrace_events"))) event_<call> = {
* .name = "<call>",
* .system = "<system>",
* .raw_init = ftrace_raw_init_event_<call>,
* .regfunc = ftrace_reg_event_<call>,
* .unregfunc = ftrace_unreg_event_<call>,
* .raw_init = ftrace_raw_init_event_<call>,
* .raw_reg = ftrace_raw_reg_event_<call>,
* .raw_unreg = ftrace_raw_unreg_event_<call>,
* .show_format = ftrace_format_<call>,
* }
*
......@@ -148,7 +148,7 @@ __attribute__((section("_ftrace_events"))) event_##call = { \
#define __entry entry
#undef TRACE_EVENT
#define TRACE_EVENT(call, proto, args, tstruct, print, assign) \
#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
\
static struct ftrace_event_call event_##call; \
\
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment