linux-kernel - [RFC PATCH 02/11] time,nohz: rename vtime_accounting_enabled to tick_accounting

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Message-Id: <1435157880-22925-3-git-send-email-riel@redhat.com>
Date:	Wed, 24 Jun 2015 10:57:51 -0400
From:	riel@...hat.com
To:	linux-kernel@...r.kernel.org
Cc:	fweisbec@...hat.com, peterz@...radead.org, mingo@...nel.org,
	tglx@...utronix.de, luto@...capital.net
Subject: [RFC PATCH 02/11] time,nohz: rename vtime_accounting_enabled to tick_accounting_disabled

From: Rik van Riel <riel@...hat.com>

Rename vtime_accounting_enabled to tick_accounting_disabled, because it
can mean either that vtime accounting is enabled, or that the system
is doing tick based sampling from a housekeeping CPU for nohz_full CPUs.

Signed-off-by: Rik van Riel <riel@...hat.com>
---
 include/linux/context_tracking.h |  4 ++--
 include/linux/vtime.h            | 17 ++++++++++-------
 kernel/sched/cputime.c           |  2 +-
 kernel/time/tick-sched.c         |  2 +-
 4 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h
index dc3b169b2b70..d7ee7eb9e0bc 100644
--- a/include/linux/context_tracking.h
+++ b/include/linux/context_tracking.h
@@ -90,7 +90,7 @@ static inline void context_tracking_init(void) { }
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
 static inline void guest_enter(void)
 {
-	if (vtime_accounting_enabled())
+	if (tick_accounting_disabled())
 		vtime_guest_enter(current);
 	else
 		current->flags |= PF_VCPU;
@@ -104,7 +104,7 @@ static inline void guest_exit(void)
 	if (context_tracking_is_enabled())
 		__context_tracking_exit(CONTEXT_GUEST);
 
-	if (vtime_accounting_enabled())
+	if (tick_accounting_disabled())
 		vtime_guest_exit(current);
 	else
 		current->flags &= ~PF_VCPU;
diff --git a/include/linux/vtime.h b/include/linux/vtime.h
index c5165fd256f9..4f5c1a3712e7 100644
--- a/include/linux/vtime.h
+++ b/include/linux/vtime.h
@@ -10,14 +10,17 @@
 struct task_struct;
 
 /*
- * vtime_accounting_enabled() definitions/declarations
+ * tick_accounting_disabled() definitions/declarations
+ *
+ * This indicates that either vtime accounting is used, or that tick
+ * based sampling is done from a housekeeping CPU for nohz_full CPUs.
  */
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
-static inline bool vtime_accounting_enabled(void) { return true; }
+static inline bool tick_accounting_disabled(void) { return true; }
 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
 
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
-static inline bool vtime_accounting_enabled(void)
+static inline bool tick_accounting_disabled(void)
 {
 	if (context_tracking_is_enabled()) {
 		if (context_tracking_cpu_is_enabled())
@@ -29,7 +32,7 @@ static inline bool vtime_accounting_enabled(void)
 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */
 
 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
-static inline bool vtime_accounting_enabled(void) { return false; }
+static inline bool tick_accounting_disabled(void) { return false; }
 #endif /* !CONFIG_VIRT_CPU_ACCOUNTING */
 
 
@@ -44,7 +47,7 @@ extern void vtime_task_switch(struct task_struct *prev);
 extern void vtime_common_task_switch(struct task_struct *prev);
 static inline void vtime_task_switch(struct task_struct *prev)
 {
-	if (vtime_accounting_enabled())
+	if (tick_accounting_disabled())
 		vtime_common_task_switch(prev);
 }
 #endif /* __ARCH_HAS_VTIME_TASK_SWITCH */
@@ -59,7 +62,7 @@ extern void vtime_account_irq_enter(struct task_struct *tsk);
 extern void vtime_common_account_irq_enter(struct task_struct *tsk);
 static inline void vtime_account_irq_enter(struct task_struct *tsk)
 {
-	if (vtime_accounting_enabled())
+	if (tick_accounting_disabled())
 		vtime_common_account_irq_enter(tsk);
 }
 #endif /* __ARCH_HAS_VTIME_ACCOUNT */
@@ -78,7 +81,7 @@ extern void vtime_gen_account_irq_exit(struct task_struct *tsk);
 
 static inline void vtime_account_irq_exit(struct task_struct *tsk)
 {
-	if (vtime_accounting_enabled())
+	if (tick_accounting_disabled())
 		vtime_gen_account_irq_exit(tsk);
 }
 
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index 97077c282626..84b2d24a2238 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -471,7 +471,7 @@ void account_process_tick(struct task_struct *p, int user_tick)
 	 * should do work on this invocation, or whether time keeping for
 	 * this CPU is done in some other way.
 	 */
-	if (vtime_accounting_enabled())
+	if (tick_accounting_disabled())
 		return;
 
 	if (sched_clock_irqtime) {
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 914259128145..3bb5a7accc9f 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -924,7 +924,7 @@ static void tick_nohz_account_idle_ticks(struct tick_sched *ts)
 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
 	unsigned long ticks;
 
-	if (vtime_accounting_enabled())
+	if (tick_accounting_disabled())
 		return;
 	/*
 	 * We stopped the tick in idle. Update process times would miss the
-- 
2.1.0

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