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Date: Fri, 22 May 2009 17:55:09 +0800
From: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To: mingo@...e.hu
CC: LKML <linux-kernel@...r.kernel.org>, tglx@...utronix.de,
Zhaolei <zhaolei@...fujitsu.com>, kosaki.motohiro@...fujitsu.com,
Steven Rostedt <rostedt@...dmis.org>, fweisbec@...il.com
Subject: [PATCH 3/3] ftrace: add tracepoint for itimer
This patch can trace itimer start/expire/cancle event
Example ftrace output:
<...>-4183 [001] 66533.730163: itimer_start: task=main which=0 it_value=13000000000 it_interval=0
<idle>-0 [001] 66546.698154: itimer_expire: task=main which=0
<...>-4183 [000] 66546.698533: itimer_cancel: task=main which=0
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
---
include/trace/events/timer.h | 66 ++++++++++++++++++++++++++++++++++++++++++
kernel/itimer.c | 17 +++++++++--
kernel/posix-cpu-timers.c | 3 ++
3 files changed, 83 insertions(+), 3 deletions(-)
diff --git a/include/trace/events/timer.h b/include/trace/events/timer.h
index e5dc9d5..767c703 100644
--- a/include/trace/events/timer.h
+++ b/include/trace/events/timer.h
@@ -175,6 +175,72 @@ TRACE_EVENT(hrtimer_cancel,
TP_printk("timer=%p func=%pf", __entry->timer, __entry->function)
);
+TRACE_EVENT(itimer_start,
+
+ TP_PROTO(int which, struct itimerval *value),
+
+ TP_ARGS(which, value),
+
+ TP_STRUCT__entry(
+ __field( int, which )
+ __field( unsigned long long, it_value )
+ __field( unsigned long long, it_interval )
+ __string( comm, current->comm )
+ ),
+
+ TP_fast_assign(
+ __entry->which = which;
+ __entry->it_value = (which == ITIMER_REAL ?
+ ktime_to_ns(timeval_to_ktime(value->it_value)) :
+ timeval_to_cputime(&value->it_value));
+ __entry->it_interval = (which == ITIMER_REAL ?
+ ktime_to_ns(timeval_to_ktime(value->it_interval)) :
+ timeval_to_cputime(&value->it_interval));
+ __assign_str(comm, current->comm);
+ ),
+
+ TP_printk("task=%s which=%d it_value=%llu it_interval=%llu", __get_str(comm),
+ __entry->which, __entry->it_value, __entry->it_interval)
+);
+
+TRACE_EVENT(itimer_expire,
+
+ TP_PROTO(int which, struct task_struct *task),
+
+ TP_ARGS(which, task),
+
+ TP_STRUCT__entry(
+ __field( int , which )
+ __string( comm, task->comm )
+ ),
+
+ TP_fast_assign(
+ __entry->which = which;
+ __assign_str(comm, task->comm);
+ ),
+
+ TP_printk("task=%s which=%d", __get_str(comm), __entry->which)
+);
+
+TRACE_EVENT(itimer_cancel,
+
+ TP_PROTO(int which),
+
+ TP_ARGS(which),
+
+ TP_STRUCT__entry(
+ __field( int , which )
+ __string( comm, current->comm )
+ ),
+
+ TP_fast_assign(
+ __entry->which = which;
+ __assign_str(comm, current->comm);
+ ),
+
+ TP_printk("task=%s which=%d", __get_str(comm), __entry->which)
+);
+
#endif /* _TRACE_TIMER_H */
/* This part must be outside protection */
diff --git a/kernel/itimer.c b/kernel/itimer.c
index 58762f7..1d2dd64 100644
--- a/kernel/itimer.c
+++ b/kernel/itimer.c
@@ -12,6 +12,7 @@
#include <linux/time.h>
#include <linux/posix-timers.h>
#include <linux/hrtimer.h>
+#include <trace/events/timer.h>
#include <asm/uaccess.h>
@@ -123,6 +124,7 @@ enum hrtimer_restart it_real_fn(struct hrtimer *timer)
struct signal_struct *sig =
container_of(timer, struct signal_struct, real_timer);
+ trace_itimer_expire(ITIMER_REAL, pid_task(sig->leader_pid, PIDTYPE_PID));
kill_pid_info(SIGALRM, SEND_SIG_PRIV, sig->leader_pid);
return HRTIMER_NORESTART;
@@ -168,8 +170,11 @@ again:
tsk->signal->it_real_incr =
timeval_to_ktime(value->it_interval);
hrtimer_start(timer, expires, HRTIMER_MODE_REL);
- } else
+ trace_itimer_start(ITIMER_REAL, value);
+ } else{
tsk->signal->it_real_incr.tv64 = 0;
+ trace_itimer_cancel(ITIMER_REAL);
+ }
spin_unlock_irq(&tsk->sighand->siglock);
break;
@@ -186,7 +191,10 @@ again:
jiffies_to_cputime(1));
set_process_cpu_timer(tsk, CPUCLOCK_VIRT,
&nval, &cval);
- }
+ trace_itimer_start(ITIMER_VIRTUAL, value);
+ }else
+ trace_itimer_cancel(ITIMER_VIRTUAL);
+
tsk->signal->it_virt_expires = nval;
tsk->signal->it_virt_incr = ninterval;
spin_unlock_irq(&tsk->sighand->siglock);
@@ -208,7 +216,10 @@ again:
jiffies_to_cputime(1));
set_process_cpu_timer(tsk, CPUCLOCK_PROF,
&nval, &cval);
- }
+ trace_itimer_start(ITIMER_PROF, value);
+ }else
+ trace_itimer_cancel(ITIMER_PROF);
+
tsk->signal->it_prof_expires = nval;
tsk->signal->it_prof_incr = ninterval;
spin_unlock_irq(&tsk->sighand->siglock);
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index bece7c0..edb4e8c 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -8,6 +8,7 @@
#include <linux/math64.h>
#include <asm/uaccess.h>
#include <linux/kernel_stat.h>
+#include <trace/events/timer.h>
/*
* Called after updating RLIMIT_CPU to set timer expiration if necessary.
@@ -1160,6 +1161,7 @@ static void check_process_timers(struct task_struct *tsk,
sig->it_prof_expires = cputime_add(
sig->it_prof_expires, ptime);
}
+ trace_itimer_expire(ITIMER_PROF, tsk);
__group_send_sig_info(SIGPROF, SEND_SIG_PRIV, tsk);
}
if (!cputime_eq(sig->it_prof_expires, cputime_zero) &&
@@ -1176,6 +1178,7 @@ static void check_process_timers(struct task_struct *tsk,
sig->it_virt_expires = cputime_add(
sig->it_virt_expires, utime);
}
+ trace_itimer_expire(ITIMER_VIRTUAL, tsk);
__group_send_sig_info(SIGVTALRM, SEND_SIG_PRIV, tsk);
}
if (!cputime_eq(sig->it_virt_expires, cputime_zero) &&
--
1.6.1.2
--
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