[PATCH] sched: Initialize rq->age_stamp on processor start

[PATCH] sched: Initialize rq->age_stamp on processor start

[minyard]

From: Corey Minyard <cminyard@mvista.com>

If the sched_clock time starts at a large value, the kernel will spin
in sched_avg_update for a long time while rq->age_stamp catches up
with rq->clock.

The comment in kernel/sched/clock.c says that there is no strict promise
that it starts at zero.  So initialize rq->age_stamp when a cpu starts up
to avoid this.

I was seeing long delays on a simulator that didn't start the clock at
zero.  This might also be an issue on reboots on processors that don't
re-initialize the timer to zero on reset, and when using kexec.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
---
 kernel/sched/core.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 268a45e..6e9570b 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5039,11 +5039,20 @@ static struct notifier_block migration_notifier = {
 	.priority = CPU_PRI_MIGRATION,
 };
 
+static void __cpuinit set_cpu_rq_start_time(void)
+{
+	int cpu = smp_processor_id();
+	struct rq *rq = cpu_rq(cpu);
+	rq->age_stamp = sched_clock_cpu(cpu);
+}
+
 static int sched_cpu_active(struct notifier_block *nfb,
 				      unsigned long action, void *hcpu)
 {
 	switch (action & ~CPU_TASKS_FROZEN) {
 	case CPU_STARTING:
+		set_cpu_rq_start_time();
+		/* fall through */
 	case CPU_DOWN_FAILED:
 		set_cpu_active((long)hcpu, true);
 		return NOTIFY_OK;
@@ -6923,6 +6932,7 @@ void __init sched_init(void)
 	init_sched_fair_class();
 
 	scheduler_running = 1;
+	set_cpu_rq_start_time();
 }
 
 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
-- 
1.8.3.1

Re: [PATCH] sched: Initialize rq->age_stamp on processor start

[Peter Zijlstra]

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On Tue, May 06, 2014 at 02:50:57PM -0500, minyard@acm.org wrote:
> From: Corey Minyard <cminyard@mvista.com>
> 
> If the sched_clock time starts at a large value, the kernel will spin
> in sched_avg_update for a long time while rq->age_stamp catches up
> with rq->clock.
> 
> The comment in kernel/sched/clock.c says that there is no strict promise
> that it starts at zero.  So initialize rq->age_stamp when a cpu starts up
> to avoid this.
> 
> I was seeing long delays on a simulator that didn't start the clock at
> zero.  This might also be an issue on reboots on processors that don't
> re-initialize the timer to zero on reset, and when using kexec.
> 
> Signed-off-by: Corey Minyard <cminyard@mvista.com>

This patch made my cris-defconfig build fail.

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Re: [PATCH] sched: Initialize rq->age_stamp on processor start

[Corey Minyard]

On 05/08/2014 11:13 AM, Peter Zijlstra wrote:
> On Tue, May 06, 2014 at 02:50:57PM -0500, minyard@acm.org wrote:
>> From: Corey Minyard <cminyard@mvista.com>
>>
>> If the sched_clock time starts at a large value, the kernel will spin
>> in sched_avg_update for a long time while rq->age_stamp catches up
>> with rq->clock.
>>
>> The comment in kernel/sched/clock.c says that there is no strict promise
>> that it starts at zero.  So initialize rq->age_stamp when a cpu starts up
>> to avoid this.
>>
>> I was seeing long delays on a simulator that didn't start the clock at
>> zero.  This might also be an issue on reboots on processors that don't
>> re-initialize the timer to zero on reset, and when using kexec.
>>
>> Signed-off-by: Corey Minyard <cminyard@mvista.com>
> This patch made my cris-defconfig build fail.
Dang, I missed propagating a change.  Yes, it's broken.  One more time...

-corey

[PATCH] sched: Initialize rq->age_stamp on processor start

[minyard]

From: Corey Minyard <cminyard@mvista.com>

If the sched_clock time starts at a large value, the kernel will spin
in sched_avg_update for a long time while rq->age_stamp catches up
with rq->clock.

The comment in kernel/sched/clock.c says that there is no strict promise
that it starts at zero.  So initialize rq->age_stamp when a cpu starts up
to avoid this.

I was seeing long delays on a simulator that didn't start the clock at
zero.  This might also be an issue on reboots on processors that don't
re-initialize the timer to zero on reset, and when using kexec.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
---
 kernel/sched/core.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 268a45e..80725c9 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5039,11 +5039,20 @@ static struct notifier_block migration_notifier = {
 	.priority = CPU_PRI_MIGRATION,
 };
 
+static void __cpuinit set_cpu_rq_start_time(void)
+{
+	int cpu = smp_processor_id();
+	struct rq *rq = cpu_rq(cpu);
+	rq->age_stamp = sched_clock_cpu(cpu);
+}
+
 static int sched_cpu_active(struct notifier_block *nfb,
 				      unsigned long action, void *hcpu)
 {
 	switch (action & ~CPU_TASKS_FROZEN) {
 	case CPU_STARTING:
+		set_cpu_rq_start_time();
+		/* fall through */
 	case CPU_DOWN_FAILED:
 		set_cpu_active((long)hcpu, true);
 		return NOTIFY_OK;
@@ -6919,6 +6928,7 @@ void __init sched_init(void)
 	if (cpu_isolated_map == NULL)
 		zalloc_cpumask_var(&cpu_isolated_map, GFP_NOWAIT);
 	idle_thread_set_boot_cpu();
+	set_cpu_rq_start_time();
 #endif
 	init_sched_fair_class();
 
-- 
1.8.3.1

Re: [PATCH] sched: Initialize rq->age_stamp on processor start

[Peter Zijlstra]

[-- Attachment #1: Type: text/plain, Size: 739 bytes --]

On Thu, May 08, 2014 at 01:47:39PM -0500, minyard@acm.org wrote:
> From: Corey Minyard <cminyard@mvista.com>
> 
> If the sched_clock time starts at a large value, the kernel will spin
> in sched_avg_update for a long time while rq->age_stamp catches up
> with rq->clock.
> 
> The comment in kernel/sched/clock.c says that there is no strict promise
> that it starts at zero.  So initialize rq->age_stamp when a cpu starts up
> to avoid this.
> 
> I was seeing long delays on a simulator that didn't start the clock at
> zero.  This might also be an issue on reboots on processors that don't
> re-initialize the timer to zero on reset, and when using kexec.
> 
> Signed-off-by: Corey Minyard <cminyard@mvista.com>

Thanks

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[tip:sched/core] sched: Initialize rq-> age_stamp on processor start

[tip-bot for Corey Minyard]

Commit-ID:  6cfa0c323ca96b7f619932725bfc0de1e4a484fc
Gitweb:     http://git.kernel.org/tip/6cfa0c323ca96b7f619932725bfc0de1e4a484fc
Author:     Corey Minyard <cminyard@mvista.com>
AuthorDate: Thu, 8 May 2014 13:47:39 -0500
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Mon, 19 May 2014 22:02:41 +0900

sched: Initialize rq->age_stamp on processor start

If the sched_clock time starts at a large value, the kernel will spin
in sched_avg_update for a long time while rq->age_stamp catches up
with rq->clock.

The comment in kernel/sched/clock.c says that there is no strict promise
that it starts at zero.  So initialize rq->age_stamp when a cpu starts up
to avoid this.

I was seeing long delays on a simulator that didn't start the clock at
zero.  This might also be an issue on reboots on processors that don't
re-initialize the timer to zero on reset, and when using kexec.

Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1399574859-11714-1-git-send-email-minyard@acm.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 kernel/sched/core.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 10d9b50..c134eb0 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5089,10 +5089,20 @@ static struct notifier_block migration_notifier = {
 	.priority = CPU_PRI_MIGRATION,
 };
 
+static void __cpuinit set_cpu_rq_start_time(void)
+{
+	int cpu = smp_processor_id();
+	struct rq *rq = cpu_rq(cpu);
+	rq->age_stamp = sched_clock_cpu(cpu);
+}
+
 static int sched_cpu_active(struct notifier_block *nfb,
 				      unsigned long action, void *hcpu)
 {
 	switch (action & ~CPU_TASKS_FROZEN) {
+	case CPU_STARTING:
+		set_cpu_rq_start_time();
+		return NOTIFY_OK;
 	case CPU_DOWN_FAILED:
 		set_cpu_active((long)hcpu, true);
 		return NOTIFY_OK;
@@ -6970,6 +6980,7 @@ void __init sched_init(void)
 	if (cpu_isolated_map == NULL)
 		zalloc_cpumask_var(&cpu_isolated_map, GFP_NOWAIT);
 	idle_thread_set_boot_cpu();
+	set_cpu_rq_start_time();
 #endif
 	init_sched_fair_class();
 

[tip:sched/core] sched: Initialize rq-> age_stamp on processor start

[tip-bot for Corey Minyard]

Commit-ID:  a803f0261bb2bb57aab5542af3174db43b2a3887
Gitweb:     http://git.kernel.org/tip/a803f0261bb2bb57aab5542af3174db43b2a3887
Author:     Corey Minyard <cminyard@mvista.com>
AuthorDate: Thu, 8 May 2014 13:47:39 -0500
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 22 May 2014 11:16:35 +0200

sched: Initialize rq->age_stamp on processor start

If the sched_clock time starts at a large value, the kernel will spin
in sched_avg_update for a long time while rq->age_stamp catches up
with rq->clock.

The comment in kernel/sched/clock.c says that there is no strict promise
that it starts at zero.  So initialize rq->age_stamp when a cpu starts up
to avoid this.

I was seeing long delays on a simulator that didn't start the clock at
zero.  This might also be an issue on reboots on processors that don't
re-initialize the timer to zero on reset, and when using kexec.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1399574859-11714-1-git-send-email-minyard@acm.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 kernel/sched/core.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index f5605b6..da302ca 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5089,10 +5089,20 @@ static struct notifier_block migration_notifier = {
 	.priority = CPU_PRI_MIGRATION,
 };
 
+static void __cpuinit set_cpu_rq_start_time(void)
+{
+	int cpu = smp_processor_id();
+	struct rq *rq = cpu_rq(cpu);
+	rq->age_stamp = sched_clock_cpu(cpu);
+}
+
 static int sched_cpu_active(struct notifier_block *nfb,
 				      unsigned long action, void *hcpu)
 {
 	switch (action & ~CPU_TASKS_FROZEN) {
+	case CPU_STARTING:
+		set_cpu_rq_start_time();
+		return NOTIFY_OK;
 	case CPU_DOWN_FAILED:
 		set_cpu_active((long)hcpu, true);
 		return NOTIFY_OK;
@@ -6970,6 +6980,7 @@ void __init sched_init(void)
 	if (cpu_isolated_map == NULL)
 		zalloc_cpumask_var(&cpu_isolated_map, GFP_NOWAIT);
 	idle_thread_set_boot_cpu();
+	set_cpu_rq_start_time();
 #endif
 	init_sched_fair_class();