From 88a4216c3ec4281fc7e6725cc3a3ccd01fb1aa14 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@elte.hu>
Date: Mon, 12 May 2008 21:20:53 +0200
Subject: [PATCH] ftrace: sched special
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
include/linux/sched.h | 6 ++++++
kernel/sched_fair.c | 3 +++
kernel/trace/trace.c | 6 +++---
kernel/trace/trace_sched_switch.c | 24 ++++++++++++++++++++++++
4 files changed, 36 insertions(+), 3 deletions(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 5b186bed54bc..360ca99033d2 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2138,6 +2138,8 @@ 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
+ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3);
#else
static inline void
ftrace_ctx_switch(void *rq, struct task_struct *prev, struct task_struct *next)
@@ -2155,6 +2157,10 @@ ftrace_wake_up_task(void *rq, struct task_struct *wakee,
static inline void ftrace_all_fair_tasks(void *__rq, void *__tr, void *__data)
{
}
+static inline void
+ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3)
+{
+}
#endif
extern long sched_setaffinity(pid_t pid, const cpumask_t *new_mask);
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index e24ecd39c4b8..dc1856f10795 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1061,6 +1061,8 @@ wake_affine(struct rq *rq, struct sched_domain *this_sd, struct rq *this_rq,
if (!(this_sd->flags & SD_WAKE_AFFINE))
return 0;
+ ftrace_special(__LINE__, curr->se.avg_overlap, sync);
+ ftrace_special(__LINE__, p->se.avg_overlap, -1);
/*
* If the currently running task will sleep within
* a reasonable amount of time then attract this newly
@@ -1238,6 +1240,7 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p)
if (unlikely(se == pse))
return;
+ ftrace_special(__LINE__, p->pid, se->last_wakeup);
cfs_rq_of(pse)->next = pse;
/*
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 3a4032492fcb..b87a26414892 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1251,7 +1251,7 @@ print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
comm);
break;
case TRACE_SPECIAL:
- trace_seq_printf(s, " %ld %ld %ld\n",
+ trace_seq_printf(s, "# %ld %ld %ld\n",
entry->special.arg1,
entry->special.arg2,
entry->special.arg3);
@@ -1335,7 +1335,7 @@ static int print_trace_fmt(struct trace_iterator *iter)
return 0;
break;
case TRACE_SPECIAL:
- ret = trace_seq_printf(s, " %ld %ld %ld\n",
+ ret = trace_seq_printf(s, "# %ld %ld %ld\n",
entry->special.arg1,
entry->special.arg2,
entry->special.arg3);
@@ -1400,7 +1400,7 @@ static int print_raw_fmt(struct trace_iterator *iter)
break;
case TRACE_SPECIAL:
case TRACE_STACK:
- ret = trace_seq_printf(s, " %ld %ld %ld\n",
+ ret = trace_seq_printf(s, "# %ld %ld %ld\n",
entry->special.arg1,
entry->special.arg2,
entry->special.arg3);
diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index 5a217e863586..bddf676914ed 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -103,6 +103,30 @@ ftrace_wake_up_task(void *__rq, struct task_struct *wakee,
wakeup_sched_wakeup(wakee, curr);
}
+void
+ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3)
+{
+ 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))
+ __trace_special(tr, data, arg1, arg2, arg3);
+
+ atomic_dec(&data->disabled);
+ local_irq_restore(flags);
+}
+
static void sched_switch_reset(struct trace_array *tr)
{
int cpu;
--
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