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ftrace: add wakeup events to sched tracer 

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar 2008-05-12 21:20:51 +02:00 committed by Thomas Gleixner
parent e309b41dd6
commit 57422797dc
5 changed files with 88 additions and 5 deletions
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42
kernel/trace/trace.c
View File

@ -57,7 +57,7 @@ static struct trace_array max_tr;
static DEFINE_PER_CPU(struct trace_array_cpu, max_data);
static int tracer_enabled = 1;
static unsigned long trace_nr_entries = 16384UL;
static unsigned long trace_nr_entries = 65536UL;
static struct tracer *trace_types __read_mostly;
static struct tracer *current_trace __read_mostly;
@ -87,6 +87,7 @@ enum trace_type {
TRACE_FN,
TRACE_CTX,
TRACE_WAKE,
TRACE_SPECIAL,
__TRACE_LAST_TYPE
@ -711,6 +712,30 @@ tracing_sched_switch_trace(struct trace_array *tr,
wake_up (&trace_wait);
}
void
tracing_sched_wakeup_trace(struct trace_array *tr,
struct trace_array_cpu *data,
struct task_struct *wakee, struct task_struct *curr,
unsigned long flags)
{
struct trace_entry *entry;
unsigned long irq_flags;
spin_lock_irqsave(&data->lock, irq_flags);
entry = tracing_get_trace_entry(tr, data);
tracing_generic_entry_update(entry, flags);
entry->type = TRACE_WAKE;
entry->ctx.prev_pid = curr->pid;
entry->ctx.prev_prio = curr->prio;
entry->ctx.prev_state = curr->state;
entry->ctx.next_pid = wakee->pid;
entry->ctx.next_prio = wakee->prio;
spin_unlock_irqrestore(&data->lock, irq_flags);
if (!(trace_flags & TRACE_ITER_BLOCK))
wake_up(&trace_wait);
}
#ifdef CONFIG_FTRACE
static void
function_trace_call(unsigned long ip, unsigned long parent_ip)
@ -1183,13 +1208,14 @@ print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
trace_seq_puts(s, ")\n");
break;
case TRACE_CTX:
case TRACE_WAKE:
S = entry->ctx.prev_state < sizeof(state_to_char) ?
state_to_char[entry->ctx.prev_state] : 'X';
comm = trace_find_cmdline(entry->ctx.next_pid);
trace_seq_printf(s, " %d:%d:%c --> %d:%d %s\n",
trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d %s\n",
entry->ctx.prev_pid,
entry->ctx.prev_prio,
S,
S, entry->type == TRACE_CTX ? "==>" : " +",
entry->ctx.next_pid,
entry->ctx.next_prio,
comm);
@ -1256,12 +1282,14 @@ static int print_trace_fmt(struct trace_iterator *iter)
return 0;
break;
case TRACE_CTX:
case TRACE_WAKE:
S = entry->ctx.prev_state < sizeof(state_to_char) ?
state_to_char[entry->ctx.prev_state] : 'X';
ret = trace_seq_printf(s, " %d:%d:%c ==> %d:%d\n",
ret = trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d\n",
entry->ctx.prev_pid,
entry->ctx.prev_prio,
S,
entry->type == TRACE_CTX ? "==>" : " +",
entry->ctx.next_pid,
entry->ctx.next_prio);
if (!ret)
@ -1301,8 +1329,11 @@ static int print_raw_fmt(struct trace_iterator *iter)
return 0;
break;
case TRACE_CTX:
case TRACE_WAKE:
S = entry->ctx.prev_state < sizeof(state_to_char) ?
state_to_char[entry->ctx.prev_state] : 'X';
if (entry->type == TRACE_WAKE)
S = '+';
ret = trace_seq_printf(s, "%d %d %c %d %d\n",
entry->ctx.prev_pid,
entry->ctx.prev_prio,
@ -1355,8 +1386,11 @@ static int print_hex_fmt(struct trace_iterator *iter)
SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip);
break;
case TRACE_CTX:
case TRACE_WAKE:
S = entry->ctx.prev_state < sizeof(state_to_char) ?
state_to_char[entry->ctx.prev_state] : 'X';
if (entry->type == TRACE_WAKE)
S = '+';
SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_pid);
SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_prio);
SEQ_PUT_HEX_FIELD_RET(s, S);

12
kernel/trace/trace.h
View File

@ -164,6 +164,12 @@ void tracing_sched_switch_trace(struct trace_array *tr,
struct task_struct *next,
unsigned long flags);
void tracing_record_cmdline(struct task_struct *tsk);
void tracing_sched_wakeup_trace(struct trace_array *tr,
struct trace_array_cpu *data,
struct task_struct *wakee,
struct task_struct *cur,
unsigned long flags);
void trace_special(struct trace_array *tr,
struct trace_array_cpu *data,
unsigned long arg1,
@ -194,11 +200,17 @@ extern cycle_t ftrace_now(int cpu);
#ifdef CONFIG_SCHED_TRACER
extern void
wakeup_sched_switch(struct task_struct *prev, struct task_struct *next);
extern void
wakeup_sched_wakeup(struct task_struct *wakee, struct task_struct *curr);
#else
static inline void
wakeup_sched_switch(struct task_struct *prev, struct task_struct *next)
{
}
static inline void
wakeup_sched_wakeup(struct task_struct *wakee, struct task_struct *curr)
{
}
#endif
#ifdef CONFIG_CONTEXT_SWITCH_TRACER

36
kernel/trace/trace_sched_switch.c
View File

@ -41,6 +41,29 @@ ctx_switch_func(struct task_struct *prev, struct task_struct *next)
local_irq_restore(flags);
}
static void wakeup_func(struct task_struct *wakee, struct task_struct *curr)
{
struct trace_array *tr = ctx_trace;
struct trace_array_cpu *data;
unsigned long flags;
long disabled;
int cpu;
if (!tracer_enabled)
return;
local_irq_save(flags);
cpu = raw_smp_processor_id();
data = tr->data[cpu];
disabled = atomic_inc_return(&data->disabled);
if (likely(disabled == 1))
tracing_sched_wakeup_trace(tr, data, wakee, curr, flags);
atomic_dec(&data->disabled);
local_irq_restore(flags);
}
void ftrace_ctx_switch(struct task_struct *prev, struct task_struct *next)
{
tracing_record_cmdline(prev);
@ -57,6 +80,19 @@ void ftrace_ctx_switch(struct task_struct *prev, struct task_struct *next)
wakeup_sched_switch(prev, next);
}
void
ftrace_wake_up_task(struct task_struct *wakee, struct task_struct *curr)
{
tracing_record_cmdline(curr);
wakeup_func(wakee, curr);
/*
* Chain to the wakeup tracer (this is a NOP if disabled):
*/
wakeup_sched_wakeup(wakee, curr);
}
static void sched_switch_reset(struct trace_array *tr)
{
int cpu;

2
kernel/trace/trace_sched_wakeup.c
View File

@ -202,7 +202,7 @@ wakeup_check_start(struct trace_array *tr, struct task_struct *p,
}
void
ftrace_wake_up_task(struct task_struct *wakee, struct task_struct *curr)
wakeup_sched_wakeup(struct task_struct *wakee, struct task_struct *curr)
{
if (likely(!tracer_enabled))
return;

1
kernel/trace/trace_selftest.c
View File

@ -8,6 +8,7 @@ static inline int trace_valid_entry(struct trace_entry *entry)
switch (entry->type) {
case TRACE_FN:
case TRACE_CTX:
case TRACE_WAKE:
return 1;
}
return 0;