sched/cleanup: scheduler related cleanup and refine

PATCH In review Michael wang 1 participant 13 messages Aug 22, 2013

Subsystems (7)

x86 ACPI MM core Scheduler +3 more subsystems

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Michael wang

author

2013-08-22 07:48 UTC #0 lore raw

cover sched/cleanup: scheduler related cleanup and refine

This patch-set will cleanup and refine the code related to scheduler and save few lines.

Rough tested (random benchmark) with latest tip/master on a desktop.

Michael Wang (11):
[PATCH 01/11] sched/cleanup: remove the extra line in init_sched_fair_class() [PATCH 02/11] sched/cleanup: remove the extra parm of alloc_thread_info_node() [PATCH 03/11] sched/cleanup: remove the extra parm of copy_flags() [PATCH 04/11] sched/cleanup: refine rt_policy()
[PATCH 05/11] sched/cleanup: remove the extra parm of wakeup_gran() [PATCH 06/11] sched/cleanup: refine __setup_irq()
[PATCH 07/11] sched/cleanup: remove the extra parm of irq_set_thread_affinity() [PATCH 08/11] sched/cleanup: remove the extra parm of sched_clock_idle_wakeup_event() [PATCH 09/11] sched/cleanup: remove the extra parm of tick_nohz_start_idle() [PATCH 10/11] sched/cleanup: remove the extra parm of retrigger_next_event() [PATCH 11/11] sched/cleanup: remove the extra parm of find_new_ilb()

---
 b/arch/x86/kernel/tsc.c         |    2 +-
 b/drivers/acpi/processor_idle.c |    4 ++--
 b/include/linux/sched.h         |    7 ++-----
 b/kernel/fork.c                 |    8 +++-----
 b/kernel/hrtimer.c              |    8 ++++----
 b/kernel/irq/internals.h        |    2 +-
 b/kernel/irq/manage.c           |    6 ++----
 b/kernel/irq/migration.c        |    2 +-
 b/kernel/sched/clock.c          |    2 +-
 b/kernel/sched/fair.c           |    1 -
 b/kernel/sched/sched.h          |    4 +---
 b/kernel/time/tick-sched.c      |    2 +-
 kernel/fork.c                   |    4 ++--
 kernel/irq/manage.c             |    7 +++----
 kernel/sched/fair.c             |    8 ++++----
 kernel/time/tick-sched.c        |    4 ++--
 16 files changed, 30 insertions(+), 41 deletions(-)

Michael wang

author

2013-08-22 07:49 UTC #1 lore raw

PATCH 1/11 sched/cleanup: remove the extra line in init_sched_fair_class()

Remove the extra line.

CC Ingo Molnar <[email protected]>

CC Peter Zijlstra <[email protected]>

Signed-off-by Michael Wang <[email protected]>

---
 kernel/sched/fair.c |    1 -
 1 file changed, 1 deletion(-)

kernel/sched/fair.c +0 -1

index aaaed57..a925e17 100644
@@ -6277,5 +6277,4 @@ __init void init_sched_fair_class(void)
 	cpu_notifier(sched_ilb_notifier, 0);
 #endif
 #endif /* SMP */
-
 }

Signature · 1 line

1.7.9.5

Michael wang

author

2013-08-22 07:51 UTC #2 lore raw

PATCH 2/11 sched/cleanup: remove the extra parm of alloc_thread_info_node()

In reply to Michael wang

Parm 'tsk' has not been used, remove it to make code clean.

CC Andrew Morton <[email protected]>

CC Al Viro <[email protected]>

CC "Eric W. Biederman" <[email protected]>

CC Oleg Nesterov <[email protected]>

CC Srikar Dronamraju <[email protected]>

CC Ingo Molnar <[email protected]>

CC Peter Zijlstra <[email protected]>

Signed-off-by Michael Wang <[email protected]>

---
 kernel/fork.c |    8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

kernel/fork.c +3 -5

index e23bb19..457945f 100644
@@ -144,8 +144,7 @@ void __weak arch_release_thread_info(struct thread_info *ti)
  * kmemcache based allocator.
  */
 # if THREAD_SIZE >= PAGE_SIZE
-static struct thread_info *alloc_thread_info_node(struct task_struct *tsk,
-						  int node)
+static struct thread_info *alloc_thread_info_node(int node)
 {
 	struct page *page = alloc_pages_node(node, THREADINFO_GFP_ACCOUNTED,
 					     THREAD_SIZE_ORDER);

@@ -160,8 +159,7 @@ static inline void free_thread_info(struct thread_info *ti)
 # else
 static struct kmem_cache *thread_info_cache;
 
-static struct thread_info *alloc_thread_info_node(struct task_struct *tsk,
-						  int node)
+static struct thread_info *alloc_thread_info_node(int node)
 {
 	return kmem_cache_alloc_node(thread_info_cache, THREADINFO_GFP, node);
 }

@@ -302,7 +300,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
 	if (!tsk)
 		return NULL;
 
-	ti = alloc_thread_info_node(tsk, node);
+	ti = alloc_thread_info_node(node);
 	if (!ti)
 		goto free_tsk;

Signature · 1 line

1.7.9.5

Michael wang

author

2013-08-22 07:52 UTC #3 lore raw

PATCH 3/11 sched/cleanup: remove the extra parm of copy_flags()

In reply to Michael wang

Parm 'clone_flags' has not been used, remove it to make code clean.

CC Andrew Morton <[email protected]>

CC Al Viro <[email protected]>

CC "Eric W. Biederman" <[email protected]>

CC Oleg Nesterov <[email protected]>

CC Srikar Dronamraju <[email protected]>

CC Ingo Molnar <[email protected]>

CC Peter Zijlstra <[email protected]>

Signed-off-by Michael Wang <[email protected]>

---
 kernel/fork.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

kernel/fork.c +2 -2

index 457945f..3c2d8fd 100644
@@ -1070,7 +1070,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
 	return 0;
 }
 
-static void copy_flags(unsigned long clone_flags, struct task_struct *p)
+static void copy_flags(struct task_struct *p)
 {
 	unsigned long new_flags = p->flags;

@@ -1223,7 +1223,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 
 	p->did_exec = 0;
 	delayacct_tsk_init(p);	/* Must remain after dup_task_struct() */
-	copy_flags(clone_flags, p);
+	copy_flags(p);
 	INIT_LIST_HEAD(&p->children);
 	INIT_LIST_HEAD(&p->sibling);
 	rcu_copy_process(p);

Signature · 1 line

1.7.9.5

Michael wang

author

2013-08-22 07:54 UTC #4 lore raw

PATCH 4/11 sched/cleanup: refine rt_policy()

In reply to Michael wang

Refine the rt_policy() to save few lines.

CC Ingo Molnar <[email protected]>

CC Peter Zijlstra <[email protected]>

Signed-off-by Michael Wang <[email protected]>

---
 kernel/sched/sched.h |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

kernel/sched/sched.h +1 -3

index 4c1cb80..b557f39 100644
@@ -82,9 +82,7 @@ extern void update_cpu_load_active(struct rq *this_rq);
 
 static inline int rt_policy(int policy)
 {
-	if (policy == SCHED_FIFO || policy == SCHED_RR)
-		return 1;
-	return 0;
+	return policy == SCHED_FIFO || policy == SCHED_RR;
 }
 
 static inline int task_has_rt_policy(struct task_struct *p)

Signature · 1 line

1.7.9.5

Michael wang

author

2013-08-22 07:54 UTC #5 lore raw

PATCH 5/11 sched/cleanup: remove the extra parm of wakeup_gran()

In reply to Michael wang

Parm 'curr' has not been used, remove it to make code clean.

CC Ingo Molnar <[email protected]>

CC Peter Zijlstra <[email protected]>

Signed-off-by Michael Wang <[email protected]>

---
 kernel/sched/fair.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

kernel/sched/fair.c +2 -2

index a925e17..05643d6 100644
@@ -3536,7 +3536,7 @@ migrate_task_rq_fair(struct task_struct *p, int next_cpu)
 #endif /* CONFIG_SMP */
 
 static unsigned long
-wakeup_gran(struct sched_entity *curr, struct sched_entity *se)
+wakeup_gran(struct sched_entity *se)
 {
 	unsigned long gran = sysctl_sched_wakeup_granularity;

@@ -3578,7 +3578,7 @@ wakeup_preempt_entity(struct sched_entity *curr, struct sched_entity *se)
 	if (vdiff <= 0)
 		return -1;
 
-	gran = wakeup_gran(curr, se);
+	gran = wakeup_gran(se);
 	if (vdiff > gran)
 		return 1;

Signature · 1 line

1.7.9.5

Michael wang

author

2013-08-22 07:55 UTC #6 lore raw

PATCH 6/11 sched/cleanup: refine __setup_irq()

In reply to Michael wang

Refine the __setup_irq() to save few lines.

CC Thomas Gleixner <[email protected]>

CC Ingo Molnar <[email protected]>

CC Peter Zijlstra <[email protected]>

Signed-off-by Michael Wang <[email protected]>

---
 kernel/irq/manage.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

kernel/irq/manage.c +2 -4

index 514bcfd..46941e7 100644
@@ -933,10 +933,8 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
 		 * dummy function which warns when called.
 		 */
 		new->handler = irq_nested_primary_handler;
-	} else {
-		if (irq_settings_can_thread(desc))
-			irq_setup_forced_threading(new);
-	}
+	} else if (irq_settings_can_thread(desc))
+		irq_setup_forced_threading(new);
 
 	/*
 	 * Create a handler thread when a thread function is supplied

Signature · 1 line

1.7.9.5

Michael wang

author

2013-08-22 07:56 UTC #7 lore raw

PATCH 7/11 sched/cleanup: remove the extra parm of irq_set_thread_affinity()

In reply to Michael wang

Parm 'force' has been ignored, and currently no one need a 'true' option, so remove it to make code clean.

CC Thomas Gleixner <[email protected]>

CC Ingo Molnar <[email protected]>

CC Peter Zijlstra <[email protected]>

Signed-off-by Michael Wang <[email protected]>

---
 kernel/irq/internals.h |    2 +-
 kernel/irq/manage.c    |    7 +++----
 kernel/irq/migration.c |    2 +-
 3 files changed, 5 insertions(+), 6 deletions(-)

kernel/irq/internals.h +1 -1

index 001fa5b..c5b4085 100644
@@ -102,7 +102,7 @@ extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask);
 extern void irq_set_thread_affinity(struct irq_desc *desc);
 
 extern int irq_do_set_affinity(struct irq_data *data,
-			       const struct cpumask *dest, bool force);
+			       const struct cpumask *dest);
 
 /* Inline functions for support of irq chips on slow busses */
 static inline void chip_bus_lock(struct irq_desc *desc)

kernel/irq/manage.c +3 -4

index 46941e7..9a71ba5 100644
@@ -143,8 +143,7 @@ static inline void
 irq_get_pending(struct cpumask *mask, struct irq_desc *desc) { }
 #endif
 
-int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask,
-			bool force)
+int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask)
 {
 	struct irq_desc *desc = irq_data_to_desc(data);
 	struct irq_chip *chip = irq_data_get_irq_chip(data);

@@ -172,7 +171,7 @@ int __irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask)
 		return -EINVAL;
 
 	if (irq_can_move_pcntxt(data)) {
-		ret = irq_do_set_affinity(data, mask, false);
+		ret = irq_do_set_affinity(data, mask);
 	} else {
 		irqd_set_move_pending(data);
 		irq_copy_pending(desc, mask);

@@ -323,7 +322,7 @@ setup_affinity(unsigned int irq, struct irq_desc *desc, struct cpumask *mask)
 		if (cpumask_intersects(mask, nodemask))
 			cpumask_and(mask, mask, nodemask);
 	}
-	irq_do_set_affinity(&desc->irq_data, mask, false);
+	irq_do_set_affinity(&desc->irq_data, mask);
 	return 0;
 }
 #else

kernel/irq/migration.c +1 -1

index ca3f4aa..4790949 100644
@@ -43,7 +43,7 @@ void irq_move_masked_irq(struct irq_data *idata)
 	 * masking the irqs.
 	 */
 	if (cpumask_any_and(desc->pending_mask, cpu_online_mask) < nr_cpu_ids)
-		irq_do_set_affinity(&desc->irq_data, desc->pending_mask, false);
+		irq_do_set_affinity(&desc->irq_data, desc->pending_mask);
 
 	cpumask_clear(desc->pending_mask);
 }

Signature · 1 line

1.7.9.5

Michael wang

author

2013-08-22 07:58 UTC #8 lore raw

PATCH 8/11 sched/cleanup: remove the extra parm of sched_clock_idle_wakeup_event()

In reply to Michael wang

Parm 'delta_ns' has not been used, remove it to make code clean.

CC Thomas Gleixner <[email protected]>

CC "H. Peter Anvin" <[email protected]>

CC Len Brown <[email protected]>

CC "Rafael J. Wysocki" <[email protected]>

CC John Stultz <[email protected]>

CC Paul Gortmaker <[email protected]>

CC Feng Tang <[email protected]>

CC Ingo Molnar <[email protected]>

CC Peter Zijlstra <[email protected]>

Signed-off-by Michael Wang <[email protected]>

---
 arch/x86/kernel/tsc.c         |    2 +-
 drivers/acpi/processor_idle.c |    4 ++--
 include/linux/sched.h         |    7 ++-----
 kernel/sched/clock.c          |    2 +-
 kernel/time/tick-sched.c      |    2 +-
 5 files changed, 7 insertions(+), 10 deletions(-)

arch/x86/kernel/tsc.c +1 -1

index 930e5d4..4a40402 100644
@@ -635,7 +635,7 @@ static void set_cyc2ns_scale(unsigned long cpu_khz, int cpu)
 					     (1UL << CYC2NS_SCALE_FACTOR));
 	}
 
-	sched_clock_idle_wakeup_event(0);
+	sched_clock_idle_wakeup_event();
 	local_irq_restore(flags);
 }

drivers/acpi/processor_idle.c +2 -2

index f98dd00..2bb49f8 100644
@@ -817,7 +817,7 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev,
 	sched_clock_idle_sleep_event();
 	acpi_idle_do_entry(cx);
 
-	sched_clock_idle_wakeup_event(0);
+	sched_clock_idle_wakeup_event();
 
 	if (cx->entry_method != ACPI_CSTATE_FFH)
 		current_thread_info()->status |= TS_POLLING;

@@ -913,7 +913,7 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
 		raw_spin_unlock(&c3_lock);
 	}
 
-	sched_clock_idle_wakeup_event(0);
+	sched_clock_idle_wakeup_event();
 
 	if (cx->entry_method != ACPI_CSTATE_FFH)
 		current_thread_info()->status |= TS_POLLING;

include/linux/sched.h +2 -5

index 45a1a88..800c57f 100644
@@ -1809,7 +1809,7 @@ static inline void sched_clock_idle_sleep_event(void)
 {
 }
 
-static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
+static inline void sched_clock_idle_wakeup_event(void)
 {
 }
 #else

@@ -1823,7 +1823,7 @@ extern int sched_clock_stable;
 
 extern void sched_clock_tick(void);
 extern void sched_clock_idle_sleep_event(void);
-extern void sched_clock_idle_wakeup_event(u64 delta_ns);
+extern void sched_clock_idle_wakeup_event(void);
 #endif
 
 #ifdef CONFIG_IRQ_TIME_ACCOUNTING

@@ -1849,9 +1849,6 @@ extern void sched_exec(void);
 #define sched_exec()   {}
 #endif
 
-extern void sched_clock_idle_sleep_event(void);
-extern void sched_clock_idle_wakeup_event(u64 delta_ns);
-
 #ifdef CONFIG_HOTPLUG_CPU
 extern void idle_task_exit(void);
 #else

kernel/sched/clock.c +1 -1

index c3ae144..d111c58 100644
@@ -294,7 +294,7 @@ EXPORT_SYMBOL_GPL(sched_clock_idle_sleep_event);
 /*
  * We just idled delta nanoseconds (called with irqs disabled):
  */
-void sched_clock_idle_wakeup_event(u64 delta_ns)
+void sched_clock_idle_wakeup_event(void)
 {
 	if (timekeeping_suspended)
 		return;

kernel/time/tick-sched.c +1 -1

index 3612fc7..4b24d9e 100644
@@ -433,7 +433,7 @@ static void tick_nohz_stop_idle(int cpu, ktime_t now)
 	update_ts_time_stats(cpu, ts, now, NULL);
 	ts->idle_active = 0;
 
-	sched_clock_idle_wakeup_event(0);
+	sched_clock_idle_wakeup_event();
 }
 
 static ktime_t tick_nohz_start_idle(int cpu, struct tick_sched *ts)

Signature · 1 line

1.7.9.5

Michael wang

author

2013-08-22 07:58 UTC #10 lore raw

PATCH 9/11 sched/cleanup: remove the extra parm of tick_nohz_start_idle()

In reply to Michael wang

Parm 'cpu' has not been used, remove it to make code clean.

CC Thomas Gleixner <[email protected]>

CC Ingo Molnar <[email protected]>

CC Peter Zijlstra <[email protected]>

Signed-off-by Michael Wang <[email protected]>

---
 kernel/time/tick-sched.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

kernel/time/tick-sched.c +2 -2

index 4b24d9e..6d24c5f 100644
@@ -436,7 +436,7 @@ static void tick_nohz_stop_idle(int cpu, ktime_t now)
 	sched_clock_idle_wakeup_event();
 }
 
-static ktime_t tick_nohz_start_idle(int cpu, struct tick_sched *ts)
+static ktime_t tick_nohz_start_idle(struct tick_sched *ts)
 {
 	ktime_t now = ktime_get();

@@ -752,7 +752,7 @@ static void __tick_nohz_idle_enter(struct tick_sched *ts)
 	ktime_t now, expires;
 	int cpu = smp_processor_id();
 
-	now = tick_nohz_start_idle(cpu, ts);
+	now = tick_nohz_start_idle(ts);
 
 	if (can_stop_idle_tick(cpu, ts)) {
 		int was_stopped = ts->tick_stopped;

Signature · 1 line

1.7.9.5

Michael wang

author

2013-08-22 07:59 UTC #11 lore raw

PATCH 10/11 sched/cleanup: remove the extra parm of retrigger_next_event()

In reply to Michael wang

Parm 'arg' has not been used, remove it to make code clean.

CC Thomas Gleixner <[email protected]>

CC Ingo Molnar <[email protected]>

CC Peter Zijlstra <[email protected]>

Signed-off-by Michael Wang <[email protected]>

---
 kernel/hrtimer.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

kernel/hrtimer.c +4 -4

index 383319b..1abca37 100644
@@ -678,7 +678,7 @@ static inline ktime_t hrtimer_update_base(struct hrtimer_cpu_base *base)
  *
  * Called with interrupts disabled via on_each_cpu()
  */
-static void retrigger_next_event(void *arg)
+static void retrigger_next_event(void)
 {
 	struct hrtimer_cpu_base *base = &__get_cpu_var(hrtimer_bases);

@@ -717,7 +717,7 @@ static int hrtimer_switch_to_hres(void)
 
 	tick_setup_sched_timer();
 	/* "Retrigger" the interrupt to get things going */
-	retrigger_next_event(NULL);
+	retrigger_next_event();
 	local_irq_restore(flags);
 	return 1;
 }

@@ -751,7 +751,7 @@ static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer,
 	return 0;
 }
 static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base) { }
-static inline void retrigger_next_event(void *arg) { }
+static inline void retrigger_next_event(void) { }
 
 #endif /* CONFIG_HIGH_RES_TIMERS */

@@ -787,7 +787,7 @@ void hrtimers_resume(void)
 		  KERN_INFO "hrtimers_resume() called with IRQs enabled!");
 
 	/* Retrigger on the local CPU */
-	retrigger_next_event(NULL);
+	retrigger_next_event();
 	/* And schedule a retrigger for all others */
 	clock_was_set_delayed();
 }

Signature · 1 line

1.7.9.5

Michael wang

author

2013-08-22 07:59 UTC #12 lore raw

PATCH 11/11 sched/cleanup: remove the extra parm of find_new_ilb()

In reply to Michael wang

Parm 'call_cpu' has not been used, remove it to make code clean.

CC Ingo Molnar <[email protected]>

CC Peter Zijlstra <[email protected]>

Signed-off-by Michael Wang <[email protected]>

---
 kernel/sched/fair.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

kernel/sched/fair.c +2 -2

index 05643d6..29ac8dd 100644
@@ -5454,7 +5454,7 @@ static struct {
 	unsigned long next_balance;     /* in jiffy units */
 } nohz ____cacheline_aligned;
 
-static inline int find_new_ilb(int call_cpu)
+static inline int find_new_ilb(void)
 {
 	int ilb = cpumask_first(nohz.idle_cpus_mask);

@@ -5475,7 +5475,7 @@ static void nohz_balancer_kick(int cpu)
 
 	nohz.next_balance++;
 
-	ilb_cpu = find_new_ilb(cpu);
+	ilb_cpu = find_new_ilb();
 
 	if (ilb_cpu >= nr_cpu_ids)
 		return;

Signature · 1 line

1.7.9.5

Michael wang

author

2013-08-22 08:07 UTC #9 lore raw

Re: [PATCH 08/11] sched/cleanup: remove the extra parm of sched_clock_idle_wakeup_event()

In reply to Michael wang

Quoted 1 line · Michael wang

Parm 'delta_ns' has not been used, remove it to make code clean.

[snip]

include/linux/sched.h extern void sched_exec(void); · line 1853

Quoted 3 lines

include/linux/sched.h +0 -2

-extern void sched_clock_idle_sleep_event(void);
-extern void sched_clock_idle_wakeup_event(u64 delta_ns);

Also remove the extra declaration here.

Regards,
Michael Wang

Quoted 31 lines

include/linux/sched.h +0 -1

-
 #ifdef CONFIG_HOTPLUG_CPU
 extern void idle_task_exit(void);
 #else

kernel/sched/clock.c +1 -1

index c3ae144..d111c58 100644
@@ -294,7 +294,7 @@ EXPORT_SYMBOL_GPL(sched_clock_idle_sleep_event);
 /*
  * We just idled delta nanoseconds (called with irqs disabled):
  */
-void sched_clock_idle_wakeup_event(u64 delta_ns)
+void sched_clock_idle_wakeup_event(void)
 {
 	if (timekeeping_suspended)
 		return;

kernel/time/tick-sched.c +1 -1

index 3612fc7..4b24d9e 100644
@@ -433,7 +433,7 @@ static void tick_nohz_stop_idle(int cpu, ktime_t now)
 	update_ts_time_stats(cpu, ts, now, NULL);
 	ts->idle_active = 0;
 
-	sched_clock_idle_wakeup_event(0);
+	sched_clock_idle_wakeup_event();
 }
 
 static ktime_t tick_nohz_start_idle(int cpu, struct tick_sched *ts)