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Subject[v2 PATCH 2/4] timers: identifying the existing pinned hrtimers.
* Arun R Bharadwaj <arun@linux.vnet.ibm.com> [2009-03-04 17:42:49]:

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

Signed-off-by: Arun R Bharadwaj <arun@linux.vnet.ibm.com>
---
kernel/sched.c | 5 +++--
kernel/time/tick-sched.c | 7 ++++---
kernel/trace/trace_sysprof.c | 3 ++-
3 files changed, 9 insertions(+), 6 deletions(-)
Index: linux.trees.git/kernel/sched.c
===================================================================
--- linux.trees.git.orig/kernel/sched.c
+++ linux.trees.git/kernel/sched.c
@@ -236,7 +236,7 @@ static void start_rt_bandwidth(struct rt

now = hrtimer_cb_get_time(&rt_b->rt_period_timer);
hrtimer_forward(&rt_b->rt_period_timer, now, rt_b->rt_period);
- hrtimer_start_expires(&rt_b->rt_period_timer,
+ hrtimer_start_expires_pinned(&rt_b->rt_period_timer,
HRTIMER_MODE_ABS);
}
spin_unlock(&rt_b->rt_runtime_lock);
@@ -1156,7 +1156,8 @@ static __init void init_hrtick(void)
*/
static void hrtick_start(struct rq *rq, u64 delay)
{
- hrtimer_start(&rq->hrtick_timer, ns_to_ktime(delay), HRTIMER_MODE_REL);
+ hrtimer_start_pinned(&rq->hrtick_timer, ns_to_ktime(delay),
+ HRTIMER_MODE_REL);
}

static inline void init_hrtick(void)
Index: linux.trees.git/kernel/time/tick-sched.c
===================================================================
--- linux.trees.git.orig/kernel/time/tick-sched.c
+++ linux.trees.git/kernel/time/tick-sched.c
@@ -348,7 +348,7 @@ void tick_nohz_stop_sched_tick(int inidl
ts->idle_expires = expires;

if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
- hrtimer_start(&ts->sched_timer, expires,
+ hrtimer_start_pinned(&ts->sched_timer, expires,
HRTIMER_MODE_ABS);
/* Check, if the timer was already in the past */
if (hrtimer_active(&ts->sched_timer))
@@ -394,7 +394,7 @@ static void tick_nohz_restart(struct tic
hrtimer_forward(&ts->sched_timer, now, tick_period);

if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
- hrtimer_start_expires(&ts->sched_timer,
+ hrtimer_start_expires_pinned(&ts->sched_timer,
HRTIMER_MODE_ABS);
/* Check, if the timer was already in the past */
if (hrtimer_active(&ts->sched_timer))
@@ -698,7 +698,8 @@ void tick_setup_sched_timer(void)

for (;;) {
hrtimer_forward(&ts->sched_timer, now, tick_period);
- hrtimer_start_expires(&ts->sched_timer, HRTIMER_MODE_ABS);
+ hrtimer_start_expires_pinned(&ts->sched_timer,
+ HRTIMER_MODE_ABS);
/* Check, if the timer was already in the past */
if (hrtimer_active(&ts->sched_timer))
break;
Index: linux.trees.git/kernel/trace/trace_sysprof.c
===================================================================
--- linux.trees.git.orig/kernel/trace/trace_sysprof.c
+++ linux.trees.git/kernel/trace/trace_sysprof.c
@@ -203,7 +203,8 @@ static void start_stack_timer(void *unus
hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
hrtimer->function = stack_trace_timer_fn;

- hrtimer_start(hrtimer, ns_to_ktime(sample_period), HRTIMER_MODE_REL);
+ hrtimer_start_pinned(hrtimer, ns_to_ktime(sample_period),
+ HRTIMER_MODE_REL);
}

static void start_stack_timers(void)

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