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| author | Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> | 2009-08-10 10:52:30 +0800 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2009-08-29 14:10:07 +0200 |
| commit | 3f0a525ebf4b8ef041a332bbe4a73aee94bb064b (patch) | |
| tree | 18c542b9896f8ac4b8d89db868ba46d38576228d /kernel/itimer.c | |
| parent | c6a2a1770245f654f35f60e1458d4356680f9519 (diff) | |
| download | lwn-3f0a525ebf4b8ef041a332bbe4a73aee94bb064b.tar.gz lwn-3f0a525ebf4b8ef041a332bbe4a73aee94bb064b.zip | |
itimers: Add tracepoints for itimer
Add tracepoints for all itimer variants: ITIMER_REAL, ITIMER_VIRTUAL
and ITIMER_PROF.
[ tglx: Fixed comments and made the output more readable, parseable
and consistent. Replaced pid_vnr by pid_nr because the hrtimer
callback can happen in any namespace ]
Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Anton Blanchard <anton@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Zhaolei <zhaolei@cn.fujitsu.com>
LKML-Reference: <4A7F8B6E.2010109@cn.fujitsu.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/itimer.c')
| -rw-r--r-- | kernel/itimer.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/itimer.c b/kernel/itimer.c index 8078a32d3b10..b03451ede528 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> @@ -122,6 +123,7 @@ 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, sig->leader_pid, 0); kill_pid_info(SIGALRM, SEND_SIG_PRIV, sig->leader_pid); return HRTIMER_NORESTART; @@ -166,6 +168,8 @@ static void set_cpu_itimer(struct task_struct *tsk, unsigned int clock_id, } it->expires = nval; it->incr = ninterval; + trace_itimer_state(clock_id == CPUCLOCK_VIRT ? + ITIMER_VIRTUAL : ITIMER_PROF, value, nval); spin_unlock_irq(&tsk->sighand->siglock); @@ -217,6 +221,7 @@ again: } else tsk->signal->it_real_incr.tv64 = 0; + trace_itimer_state(ITIMER_REAL, value, 0); spin_unlock_irq(&tsk->sighand->siglock); break; case ITIMER_VIRTUAL: |