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sched: add latency tracer callbacks to the scheduler 

add 3 lightweight callbacks to the tracer backend.

zero impact if tracing is turned off.

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 21:20:41 +02:00 committed by Thomas Gleixner
parent 75d3bce2fc
commit bd3bff9e20
2 changed files with 29 additions and 0 deletions
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26
include/linux/sched.h
View File

@ -2117,6 +2117,32 @@ static inline void arch_pick_mmap_layout(struct mm_struct *mm)
}
#endif
#ifdef CONFIG_CONTEXT_SWITCH_TRACER
extern void
ftrace_ctx_switch(struct task_struct *prev, struct task_struct *next);
#else
static inline void
ftrace_ctx_switch(struct task_struct *prev, struct task_struct *next)
{
}
#endif
#ifdef CONFIG_SCHED_TRACER
extern void
ftrace_wake_up_task(struct task_struct *wakee, struct task_struct *curr);
extern void
ftrace_wake_up_new_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)
{
}
static inline void
ftrace_wake_up_new_task(struct task_struct *wakee, struct task_struct *curr)
{
}
#endif
extern long sched_setaffinity(pid_t pid, const cpumask_t *new_mask);
extern long sched_getaffinity(pid_t pid, cpumask_t *mask);

3
kernel/sched.c
View File

@ -2467,6 +2467,7 @@ 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);
schedstat_inc(p, se.nr_wakeups);
if (sync)
schedstat_inc(p, se.nr_wakeups_sync);
@ -2611,6 +2612,7 @@ 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_new_task(p, rq->curr);
check_preempt_curr(rq, p);
#ifdef CONFIG_SMP
if (p->sched_class->task_wake_up)
@ -2783,6 +2785,7 @@ 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);
mm = next->mm;
oldmm = prev->active_mm;
/*