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Commit 4e655519 authored by Ingo Molnar's avatar Ingo Molnar Committed by Thomas Gleixner
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ftrace: sched tracer, trace full rbtree 

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 4c1f4d4f
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Showing with 108 additions and 52 deletions
include/linux/sched.h
View file @ 4e655519
......@@ -2119,20 +2119,34 @@ static inline void arch_pick_mmap_layout(struct mm_struct *mm)
#ifdef CONFIG_CONTEXT_SWITCH_TRACER
extern void
ftrace_ctx_switch(struct task_struct *prev, struct task_struct *next);
ftrace_ctx_switch(void *rq, struct task_struct *prev, struct task_struct *next);
extern void
ftrace_wake_up_task(void *rq, struct task_struct *wakee,
struct task_struct *curr);
extern void ftrace_all_fair_tasks(void *__rq, void *__tr, void *__data);
extern void
__trace_special(void *__tr, void *__data,
unsigned long arg1, unsigned long arg2, unsigned long arg3);
#else
static inline void
ftrace_ctx_switch(struct task_struct *prev, struct task_struct *next)
ftrace_ctx_switch(void *rq, struct task_struct *prev, struct task_struct *next)
{
}
static inline void
sched_trace_special(unsigned long p1, unsigned long p2, unsigned long p3)
{
}
static inline void
ftrace_wake_up_task(void *rq, struct task_struct *wakee,
struct task_struct *curr)
{
}
static inline void ftrace_all_fair_tasks(void *__rq, void *__tr, void *__data)
{
}
#endif
#ifdef CONFIG_SCHED_TRACER
extern void
ftrace_wake_up_task(struct task_struct *wakee, struct task_struct *curr);
#else
static inline void
ftrace_wake_up_task(struct task_struct *wakee, struct task_struct *curr)
__trace_special(void *__tr, void *__data,
unsigned long arg1, unsigned long arg2, unsigned long arg3)
{
}
#endif
......
kernel/sched.c
View file @ 4e655519
......@@ -2394,6 +2394,35 @@ static int sched_balance_self(int cpu, int flag)
#endif /* CONFIG_SMP */
#ifdef CONFIG_CONTEXT_SWITCH_TRACER
void ftrace_all_fair_tasks(void *__rq, void *__tr, void *__data)
{
struct sched_entity *se;
struct task_struct *p;
struct rb_node *curr;
struct rq *rq = __rq;
curr = first_fair(&rq->cfs);
if (!curr)
return;
while (curr) {
se = rb_entry(curr, struct sched_entity, run_node);
if (!entity_is_task(se))
continue;
p = task_of(se);
__trace_special(__tr, __data,
p->pid, p->se.vruntime, p->se.sum_exec_runtime);
curr = rb_next(curr);
}
}
#endif
/***
* try_to_wake_up - wake up a thread
* @p: the to-be-woken-up thread
......@@ -2468,7 +2497,7 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync)
out_activate:
#endif /* CONFIG_SMP */
ftrace_wake_up_task(p, rq->curr);
ftrace_wake_up_task(rq, p, rq->curr);
schedstat_inc(p, se.nr_wakeups);
if (sync)
schedstat_inc(p, se.nr_wakeups_sync);
......@@ -2613,7 +2642,7 @@ void wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
p->sched_class->task_new(rq, p);
inc_nr_running(rq);
}
ftrace_wake_up_task(p, rq->curr);
ftrace_wake_up_task(rq, p, rq->curr);
check_preempt_curr(rq, p);
#ifdef CONFIG_SMP
if (p->sched_class->task_wake_up)
......@@ -2786,7 +2815,7 @@ context_switch(struct rq *rq, struct task_struct *prev,
struct mm_struct *mm, *oldmm;
prepare_task_switch(rq, prev, next);
ftrace_ctx_switch(prev, next);
ftrace_ctx_switch(rq, prev, next);
mm = next->mm;
oldmm = prev->active_mm;
/*
......
kernel/trace/trace.c
View file @ 4e655519
......@@ -66,7 +66,18 @@ static struct tracer *current_trace __read_mostly;
static int max_tracer_type_len;
static DEFINE_MUTEX(trace_types_lock);
static DECLARE_WAIT_QUEUE_HEAD (trace_wait);
static DECLARE_WAIT_QUEUE_HEAD(trace_wait);
unsigned long trace_flags = TRACE_ITER_PRINT_PARENT;
/*
* FIXME: where should this be called?
*/
void trace_wake_up(void)
{
if (!(trace_flags & TRACE_ITER_BLOCK))
wake_up(&trace_wait);
}
#define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(struct trace_entry))
......@@ -103,18 +114,6 @@ enum trace_flag_type {
TRACE_FLAG_SOFTIRQ = 0x08,
};
enum trace_iterator_flags {
TRACE_ITER_PRINT_PARENT = 0x01,
TRACE_ITER_SYM_OFFSET = 0x02,
TRACE_ITER_SYM_ADDR = 0x04,
TRACE_ITER_VERBOSE = 0x08,
TRACE_ITER_RAW = 0x10,
TRACE_ITER_HEX = 0x20,
TRACE_ITER_BIN = 0x40,
TRACE_ITER_BLOCK = 0x80,
TRACE_ITER_STACKTRACE = 0x100,
};
#define TRACE_ITER_SYM_MASK \
(TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
......@@ -132,8 +131,6 @@ static const char *trace_options[] = {
NULL
};
static unsigned trace_flags = TRACE_ITER_PRINT_PARENT;
static DEFINE_SPINLOCK(ftrace_max_lock);
/*
......@@ -660,9 +657,6 @@ trace_function(struct trace_array *tr, struct trace_array_cpu *data,
entry->fn.ip = ip;
entry->fn.parent_ip = parent_ip;
spin_unlock_irqrestore(&data->lock, irq_flags);
if (!(trace_flags & TRACE_ITER_BLOCK))
wake_up(&trace_wait);
}
void
......@@ -673,10 +667,14 @@ ftrace(struct trace_array *tr, struct trace_array_cpu *data,
trace_function(tr, data, ip, parent_ip, flags);
}
#ifdef CONFIG_CONTEXT_SWITCH_TRACER
void
trace_special(struct trace_array *tr, struct trace_array_cpu *data,
unsigned long arg1, unsigned long arg2, unsigned long arg3)
__trace_special(void *__tr, void *__data,
unsigned long arg1, unsigned long arg2, unsigned long arg3)
{
struct trace_array_cpu *data = __data;
struct trace_array *tr = __tr;
struct trace_entry *entry;
unsigned long irq_flags;
......@@ -688,11 +686,10 @@ trace_special(struct trace_array *tr, struct trace_array_cpu *data,
entry->special.arg2 = arg2;
entry->special.arg3 = arg3;
spin_unlock_irqrestore(&data->lock, irq_flags);
if (!(trace_flags & TRACE_ITER_BLOCK))
wake_up(&trace_wait);
}
#endif
void __trace_stack(struct trace_array *tr,
struct trace_array_cpu *data,
unsigned long flags,
......@@ -739,9 +736,6 @@ tracing_sched_switch_trace(struct trace_array *tr,
entry->ctx.next_prio = next->prio;
__trace_stack(tr, data, flags, 4);
spin_unlock_irqrestore(&data->lock, irq_flags);
if (!(trace_flags & TRACE_ITER_BLOCK))
wake_up(&trace_wait);
}
void
......@@ -765,9 +759,6 @@ tracing_sched_wakeup_trace(struct trace_array *tr,
entry->ctx.next_prio = wakee->prio;
__trace_stack(tr, data, flags, 5);
spin_unlock_irqrestore(&data->lock, irq_flags);
if (!(trace_flags & TRACE_ITER_BLOCK))
wake_up(&trace_wait);
}
#ifdef CONFIG_FTRACE
......@@ -1258,7 +1249,7 @@ print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
comm);
break;
case TRACE_SPECIAL:
trace_seq_printf(s, " %lx %lx %lx\n",
trace_seq_printf(s, " %ld %ld %ld\n",
entry->special.arg1,
entry->special.arg2,
entry->special.arg3);
......@@ -1344,7 +1335,7 @@ static int print_trace_fmt(struct trace_iterator *iter)
return 0;
break;
case TRACE_SPECIAL:
ret = trace_seq_printf(s, " %lx %lx %lx\n",
ret = trace_seq_printf(s, " %ld %ld %ld\n",
entry->special.arg1,
entry->special.arg2,
entry->special.arg3);
......@@ -1409,7 +1400,7 @@ static int print_raw_fmt(struct trace_iterator *iter)
break;
case TRACE_SPECIAL:
case TRACE_STACK:
ret = trace_seq_printf(s, " %lx %lx %lx\n",
ret = trace_seq_printf(s, " %ld %ld %ld\n",
entry->special.arg1,
entry->special.arg2,
entry->special.arg3);
......
kernel/trace/trace.h
View file @ 4e655519
......@@ -274,4 +274,18 @@ extern int trace_selftest_startup_sched_switch(struct tracer *trace,
extern void *head_page(struct trace_array_cpu *data);
extern unsigned long trace_flags;
enum trace_iterator_flags {
TRACE_ITER_PRINT_PARENT = 0x01,
TRACE_ITER_SYM_OFFSET = 0x02,
TRACE_ITER_SYM_ADDR = 0x04,
TRACE_ITER_VERBOSE = 0x08,
TRACE_ITER_RAW = 0x10,
TRACE_ITER_HEX = 0x20,
TRACE_ITER_BIN = 0x40,
TRACE_ITER_BLOCK = 0x80,
TRACE_ITER_STACKTRACE = 0x100,
};
#endif /* _LINUX_KERNEL_TRACE_H */
kernel/trace/trace_sched_switch.c
View file @ 4e655519
......@@ -18,7 +18,7 @@ static struct trace_array *ctx_trace;
static int __read_mostly tracer_enabled;
static void
ctx_switch_func(struct task_struct *prev, struct task_struct *next)
ctx_switch_func(void *__rq, struct task_struct *prev, struct task_struct *next)
{
struct trace_array *tr = ctx_trace;
struct trace_array_cpu *data;
......@@ -34,14 +34,17 @@ ctx_switch_func(struct task_struct *prev, struct task_struct *next)
data = tr->data[cpu];
disabled = atomic_inc_return(&data->disabled);
if (likely(disabled == 1))
if (likely(disabled == 1)) {
tracing_sched_switch_trace(tr, data, prev, next, flags);
ftrace_all_fair_tasks(__rq, tr, data);
}
atomic_dec(&data->disabled);
local_irq_restore(flags);
}
static void wakeup_func(struct task_struct *wakee, struct task_struct *curr)
static void
wakeup_func(void *__rq, struct task_struct *wakee, struct task_struct *curr)
{
struct trace_array *tr = ctx_trace;
struct trace_array_cpu *data;
......@@ -57,14 +60,18 @@ static void wakeup_func(struct task_struct *wakee, struct task_struct *curr)
data = tr->data[cpu];
disabled = atomic_inc_return(&data->disabled);
if (likely(disabled == 1))
if (likely(disabled == 1)) {
tracing_sched_wakeup_trace(tr, data, wakee, curr, flags);
ftrace_all_fair_tasks(__rq, tr, data);
}
atomic_dec(&data->disabled);
local_irq_restore(flags);
}
void ftrace_ctx_switch(struct task_struct *prev, struct task_struct *next)
void
ftrace_ctx_switch(void *__rq, struct task_struct *prev,
struct task_struct *next)
{
tracing_record_cmdline(prev);
......@@ -72,7 +79,7 @@ void ftrace_ctx_switch(struct task_struct *prev, struct task_struct *next)
* If tracer_switch_func only points to the local
* switch func, it still needs the ptr passed to it.
*/
ctx_switch_func(prev, next);
ctx_switch_func(__rq, prev, next);
/*
* Chain to the wakeup tracer (this is a NOP if disabled):
......@@ -81,11 +88,12 @@ void ftrace_ctx_switch(struct task_struct *prev, struct task_struct *next)
}
void
ftrace_wake_up_task(struct task_struct *wakee, struct task_struct *curr)
ftrace_wake_up_task(void *__rq, struct task_struct *wakee,
struct task_struct *curr)
{
tracing_record_cmdline(curr);
wakeup_func(wakee, curr);
wakeup_func(__rq, wakee, curr);
/*
* Chain to the wakeup tracer (this is a NOP if disabled):
......
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