linux-kernel - [v4 RFC PATCH 2/4] timers: Identifying the existing pinned timers

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Message-ID: <20090401113429.GC22478@linux.vnet.ibm.com>
Date:	Wed, 1 Apr 2009 17:04:29 +0530
From:	Arun R Bharadwaj <arun@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org
Cc:	a.p.zijlstra@...llo.nl, ego@...ibm.com, tglx@...utronix.de,
	mingo@...e.hu, andi@...stfloor.org, venkatesh.pallipadi@...el.com,
	vatsa@...ux.vnet.ibm.com, arjan@...radead.org,
	svaidy@...ux.vnet.ibm.com, Arun Bharadwaj <arun@...ux.vnet.ibm.com>
Subject: [v4 RFC PATCH 2/4] timers: Identifying the existing pinned timers

* Arun R Bharadwaj <arun@...ux.vnet.ibm.com> [2009-04-01 17:01:28]:

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@...ux.vnet.ibm.com>
---
 arch/x86/kernel/apic/x2apic_uv_x.c |    2 +-
 kernel/sched.c                     |    5 +++--
 kernel/time/tick-sched.c           |    7 ++++---
 kernel/trace/trace_sysprof.c       |    3 ++-
 4 files changed, 10 insertions(+), 7 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)
Index: linux.trees.git/arch/x86/kernel/apic/x2apic_uv_x.c
===================================================================
--- linux.trees.git.orig/arch/x86/kernel/apic/x2apic_uv_x.c
+++ linux.trees.git/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -455,7 +455,7 @@ static void uv_heartbeat(unsigned long i
 	uv_set_scir_bits(bits);
 
 	/* 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)
--
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