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timers: Identifying the existing pinned timers

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* Arun R Bharadwaj <arun@linux.vnet.ibm.com> [2009-04-16 12:11:36]:

The following pinned hrtimers have been identified and marked:
1)sched_rt_period_timer
2)tick_sched_timer
3)stack_trace_timer_fn

[ tglx: fixup the hrtimer pinned mode ]

Signed-off-by: Arun R Bharadwaj <arun@linux.vnet.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Arun R Bharadwaj 2009-04-16 12:14:37 +05:30 committed by Thomas Gleixner
parent 597d027573
commit 5c333864a6
4 changed files with 9 additions and 7 deletions
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2
arch/x86/kernel/apic/x2apic_uv_x.c
View file

@ -463,7 +463,7 @@ static void uv_heartbeat(unsigned long ignored)
uv_set_scir_bits(bits); uv_set_scir_bits(bits);
/* enable next timer period */ /* enable next timer period */
mod_timer(timer, jiffies + SCIR_CPU_HB_INTERVAL); mod_timer_pinned(timer, jiffies + SCIR_CPU_HB_INTERVAL);
} }
static void __cpuinit uv_heartbeat_enable(int cpu) static void __cpuinit uv_heartbeat_enable(int cpu)

4
kernel/sched.c
View file

@ -244,7 +244,7 @@ static void start_rt_bandwidth(struct rt_bandwidth *rt_b)
hard = hrtimer_get_expires(&rt_b->rt_period_timer); hard = hrtimer_get_expires(&rt_b->rt_period_timer);
delta = ktime_to_ns(ktime_sub(hard, soft)); delta = ktime_to_ns(ktime_sub(hard, soft));
__hrtimer_start_range_ns(&rt_b->rt_period_timer, soft, delta, __hrtimer_start_range_ns(&rt_b->rt_period_timer, soft, delta,
HRTIMER_MODE_ABS, 0); HRTIMER_MODE_ABS_PINNED, 0);
} }
spin_unlock(&rt_b->rt_runtime_lock); spin_unlock(&rt_b->rt_runtime_lock);
} }
@ -1154,7 +1154,7 @@ static __init void init_hrtick(void)
static void hrtick_start(struct rq *rq, u64 delay) static void hrtick_start(struct rq *rq, u64 delay)
{ {
__hrtimer_start_range_ns(&rq->hrtick_timer, ns_to_ktime(delay), 0, __hrtimer_start_range_ns(&rq->hrtick_timer, ns_to_ktime(delay), 0,
HRTIMER_MODE_REL, 0); HRTIMER_MODE_REL_PINNED, 0);
} }
static inline void init_hrtick(void) static inline void init_hrtick(void)

7
kernel/time/tick-sched.c
View file

@ -349,7 +349,7 @@ void tick_nohz_stop_sched_tick(int inidle)
if (ts->nohz_mode == NOHZ_MODE_HIGHRES) { if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
hrtimer_start(&ts->sched_timer, expires, hrtimer_start(&ts->sched_timer, expires,
HRTIMER_MODE_ABS); HRTIMER_MODE_ABS_PINNED);
/* Check, if the timer was already in the past */ /* Check, if the timer was already in the past */
if (hrtimer_active(&ts->sched_timer)) if (hrtimer_active(&ts->sched_timer))
goto out; goto out;
@ -395,7 +395,7 @@ static void tick_nohz_restart(struct tick_sched *ts, ktime_t now)
if (ts->nohz_mode == NOHZ_MODE_HIGHRES) { if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
hrtimer_start_expires(&ts->sched_timer, hrtimer_start_expires(&ts->sched_timer,
HRTIMER_MODE_ABS); HRTIMER_MODE_ABS_PINNED);
/* Check, if the timer was already in the past */ /* Check, if the timer was already in the past */
if (hrtimer_active(&ts->sched_timer)) if (hrtimer_active(&ts->sched_timer))
break; break;
@ -698,7 +698,8 @@ void tick_setup_sched_timer(void)
for (;;) { for (;;) {
hrtimer_forward(&ts->sched_timer, now, tick_period); hrtimer_forward(&ts->sched_timer, now, tick_period);
hrtimer_start_expires(&ts->sched_timer, HRTIMER_MODE_ABS); hrtimer_start_expires(&ts->sched_timer,
HRTIMER_MODE_ABS_PINNED);
/* Check, if the timer was already in the past */ /* Check, if the timer was already in the past */
if (hrtimer_active(&ts->sched_timer)) if (hrtimer_active(&ts->sched_timer))
break; break;

3
kernel/trace/trace_sysprof.c
View file

@ -203,7 +203,8 @@ static void start_stack_timer(void *unused)
hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
hrtimer->function = stack_trace_timer_fn; hrtimer->function = stack_trace_timer_fn;
hrtimer_start(hrtimer, ns_to_ktime(sample_period), HRTIMER_MODE_REL); hrtimer_start(hrtimer, ns_to_ktime(sample_period),
HRTIMER_MODE_REL_PINNED);
} }
static void start_stack_timers(void) static void start_stack_timers(void)