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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2011-12-11 19:14:42 +0100 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2012-10-29 14:34:48 -0400 |
| commit | caf8bd35d8d12d6caebddd02361a05602ad7c085 (patch) | |
| tree | 3d44859448cc23902fd13fac2535586ff58973d3 | |
| parent | d877fba805ee06705f1f067a39f9e3784b81ca50 (diff) | |
| download | linux-rt-rfc/frederic/nohz/cpuse-v4-ported-to-v3.7-rc3.tar.gz | |
nohz, not for merge: Add tickless tracingrfc/frederic/nohz/cpuse-v4-ported-to-v3.7-rc3
add hoc tickless tracing
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
| -rw-r--r-- | arch/x86/kernel/smp.c | 2 | ||||
| -rw-r--r-- | kernel/cpuset.c | 1 | ||||
| -rw-r--r-- | kernel/time/tick-sched.c | 7 |
3 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/kernel/smp.c b/arch/x86/kernel/smp.c index 0bad72d05cc2b..45f217667f6b9 100644 --- a/arch/x86/kernel/smp.c +++ b/arch/x86/kernel/smp.c @@ -264,6 +264,7 @@ finish: void smp_reschedule_interrupt(struct pt_regs *regs) { ack_APIC_irq(); + trace_printk("IPI: Scheduler\n"); inc_irq_stat(irq_resched_count); scheduler_ipi(); /* @@ -276,6 +277,7 @@ void smp_cpuset_update_nohz_interrupt(struct pt_regs *regs) { ack_APIC_irq(); irq_enter(); + trace_printk("IPI: Nohz update\n"); tick_nohz_check_adaptive(); inc_irq_stat(irq_call_count); irq_exit(); diff --git a/kernel/cpuset.c b/kernel/cpuset.c index 218abc8795c84..84f099c0218cf 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -1212,6 +1212,7 @@ static cpumask_t nohz_cpuset_mask; static void flush_cputime_interrupt(void *unused) { + trace_printk("IPI: flush cputime\n"); tick_nohz_flush_current_times(false); } diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index bdd40bb3dd400..db19c2dcb264d 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -376,6 +376,7 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts, if (!ts->tick_stopped) { ts->last_tick = hrtimer_get_expires(&ts->sched_timer); ts->tick_stopped = 1; + trace_printk("Stop tick\n"); } /* @@ -581,6 +582,7 @@ static void tick_nohz_cpuset_stop_tick(struct tick_sched *ts) ts->saved_jiffies = jiffies; set_thread_flag(TIF_NOHZ); + trace_printk("set TIF_NOHZ\n"); } } #else @@ -659,6 +661,7 @@ static void __tick_nohz_restart_sched_tick(struct tick_sched *ts, ktime_t now) ts->idle_exittime = now; tick_nohz_restart(ts, now); + trace_printk("Restart sched tick\n"); } /** @@ -1012,6 +1015,7 @@ static void tick_nohz_restart_adaptive(void) tick_nohz_flush_current_times(true); tick_nohz_restart_sched_tick(); clear_thread_flag(TIF_NOHZ); + trace_printk("clear TIF_NOHZ\n"); tick_nohz_cpu_exit_qs(); } @@ -1031,6 +1035,7 @@ void cpuset_exit_nohz_interrupt(void *unused) { struct tick_sched *ts = &__get_cpu_var(tick_cpu_sched); + trace_printk("IPI: Nohz exit\n"); if (ts->tick_stopped && !is_idle_task(current)) tick_nohz_restart_adaptive(); } @@ -1052,6 +1057,7 @@ void tick_nohz_pre_schedule(void) if (test_thread_flag(TIF_NOHZ)) { tick_nohz_flush_current_times(true); clear_thread_flag(TIF_NOHZ); + trace_printk("clear TIF_NOHZ\n"); /* FIXME: warn if we are in RCU idle mode */ } } @@ -1147,6 +1153,7 @@ static enum hrtimer_restart tick_sched_timer(struct hrtimer *timer) } update_process_times(user); profile_tick(CPU_PROFILING); + trace_printk("tick\n"); } hrtimer_forward(timer, now, tick_period); |