From: Ingo Molnar <[EMAIL PROTECTED]> add 3 lightweight callbacks to the tracer backend.
zero impact if tracing is turned off. Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]> --- include/linux/sched.h | 26 ++++++++++++++++++++++++++ kernel/sched.c | 3 +++ 2 files changed, 29 insertions(+) Index: linux/include/linux/sched.h =================================================================== --- linux.orig/include/linux/sched.h +++ linux/include/linux/sched.h @@ -2027,6 +2027,32 @@ extern int sched_mc_power_savings, sched extern void normalize_rt_tasks(void); +#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 + #ifdef CONFIG_FAIR_GROUP_SCHED extern struct task_group init_task_group; Index: linux/kernel/sched.c =================================================================== --- linux.orig/kernel/sched.c +++ linux/kernel/sched.c @@ -1867,6 +1867,7 @@ static int try_to_wake_up(struct task_st 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); @@ -2007,6 +2008,7 @@ void wake_up_new_task(struct task_struct 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) @@ -2179,6 +2181,7 @@ context_switch(struct rq *rq, struct tas struct mm_struct *mm, *oldmm; prepare_task_switch(rq, prev, next); + ftrace_ctx_switch(prev, next); mm = next->mm; oldmm = prev->active_mm; /* -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/