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cputime: Use a proper subsystem naming for vtime related APIs

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Use a naming based on vtime as a prefix for virtual based
cputime accounting APIs:

- account_system_vtime() -> vtime_account()
- account_switch_vtime() -> vtime_task_switch()

It makes it easier to allow for further declension such
as vtime_account_system(), vtime_account_idle(), ... if we
want to find out the context we account to from generic code.

This also make it better to know on which subsystem these APIs
refer to.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
This commit is contained in:
Frederic Weisbecker 2012-09-08 15:23:11 +02:00
parent bc2a27cd27
commit bf9fae9f5e
9 changed files with 27 additions and 27 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
arch/ia64/kernel/time.c
View file

@ -88,7 +88,7 @@ extern cputime_t cycle_to_cputime(u64 cyc);
* accumulated times to the current process, and to prepare accounting on
* the next process.
*/
void account_switch_vtime(struct task_struct *prev)
void vtime_task_switch(struct task_struct *prev)
{
struct thread_info *pi = task_thread_info(prev);
struct thread_info *ni = task_thread_info(current);
@ -116,7 +116,7 @@ void account_switch_vtime(struct task_struct *prev)
* Account time for a transition between system, hard irq or soft irq state.
* Note that this function is called with interrupts enabled.
*/
void account_system_vtime(struct task_struct *tsk)
void vtime_account(struct task_struct *tsk)
{
struct thread_info *ti = task_thread_info(tsk);
unsigned long flags;
@ -138,7 +138,7 @@ void account_system_vtime(struct task_struct *tsk)
local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(account_system_vtime);
EXPORT_SYMBOL_GPL(vtime_account);
/*
* Called from the timer interrupt handler to charge accumulated user time

10
arch/powerpc/kernel/time.c
View file

@ -291,7 +291,7 @@ static inline u64 calculate_stolen_time(u64 stop_tb)
* Account time for a transition between system, hard irq
* or soft irq state.
*/
void account_system_vtime(struct task_struct *tsk)
void vtime_account(struct task_struct *tsk)
{
u64 now, nowscaled, delta, deltascaled;
unsigned long flags;
@ -343,14 +343,14 @@ void account_system_vtime(struct task_struct *tsk)
}
local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(account_system_vtime);
EXPORT_SYMBOL_GPL(vtime_account);
/*
* Transfer the user and system times accumulated in the paca
* by the exception entry and exit code to the generic process
* user and system time records.
* Must be called with interrupts disabled.
* Assumes that account_system_vtime() has been called recently
* Assumes that vtime_account() has been called recently
* (i.e. since the last entry from usermode) so that
* get_paca()->user_time_scaled is up to date.
*/
@ -366,9 +366,9 @@ void account_process_tick(struct task_struct *tsk, int user_tick)
account_user_time(tsk, utime, utimescaled);
}
void account_switch_vtime(struct task_struct *prev)
void vtime_task_switch(struct task_struct *prev)
{
account_system_vtime(prev);
vtime_account(prev);
account_process_tick(prev, 0);
}

6
arch/s390/kernel/vtime.c
View file

@ -99,7 +99,7 @@ static int do_account_vtime(struct task_struct *tsk, int hardirq_offset)
return virt_timer_forward(user + system);
}
void account_switch_vtime(struct task_struct *prev)
void vtime_task_switch(struct task_struct *prev)
{
struct thread_info *ti;
@ -122,7 +122,7 @@ void account_process_tick(struct task_struct *tsk, int user_tick)
* Update process times based on virtual cpu times stored by entry.S
* to the lowcore fields user_timer, system_timer & steal_clock.
*/
void account_system_vtime(struct task_struct *tsk)
void vtime_account(struct task_struct *tsk)
{
struct thread_info *ti = task_thread_info(tsk);
u64 timer, system;
@ -138,7 +138,7 @@ void account_system_vtime(struct task_struct *tsk)
virt_timer_forward(system);
}
EXPORT_SYMBOL_GPL(account_system_vtime);
EXPORT_SYMBOL_GPL(vtime_account);
void __kprobes vtime_stop_cpu(void)
{

8
include/linux/hardirq.h
View file

@ -132,11 +132,11 @@ extern void synchronize_irq(unsigned int irq);
struct task_struct;
#if !defined(CONFIG_VIRT_CPU_ACCOUNTING) && !defined(CONFIG_IRQ_TIME_ACCOUNTING)
static inline void account_system_vtime(struct task_struct *tsk)
static inline void vtime_account(struct task_struct *tsk)
{
}
#else
extern void account_system_vtime(struct task_struct *tsk);
extern void vtime_account(struct task_struct *tsk);
#endif
#if defined(CONFIG_TINY_RCU) || defined(CONFIG_TINY_PREEMPT_RCU)
@ -162,7 +162,7 @@ extern void rcu_nmi_exit(void);
*/
#define __irq_enter() \
do { \
account_system_vtime(current); \
vtime_account(current); \
add_preempt_count(HARDIRQ_OFFSET); \
trace_hardirq_enter(); \
} while (0)
@ -178,7 +178,7 @@ extern void irq_enter(void);
#define __irq_exit() \
do { \
trace_hardirq_exit(); \
account_system_vtime(current); \
vtime_account(current); \
sub_preempt_count(HARDIRQ_OFFSET); \
} while (0)

4
include/linux/kernel_stat.h
View file

@ -131,9 +131,9 @@ extern void account_steal_ticks(unsigned long ticks);
extern void account_idle_ticks(unsigned long ticks);
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
extern void account_switch_vtime(struct task_struct *prev);
extern void vtime_task_switch(struct task_struct *prev);
#else
static inline void account_switch_vtime(struct task_struct *prev) { }
static inline void vtime_task_switch(struct task_struct *prev) { }
#endif
#endif /* _LINUX_KERNEL_STAT_H */

4
include/linux/kvm_host.h
View file

@ -685,7 +685,7 @@ static inline int kvm_deassign_device(struct kvm *kvm,
static inline void kvm_guest_enter(void)
{
BUG_ON(preemptible());
account_system_vtime(current);
vtime_account(current);
current->flags |= PF_VCPU;
/* KVM does not hold any references to rcu protected data when it
* switches CPU into a guest mode. In fact switching to a guest mode
@ -699,7 +699,7 @@ static inline void kvm_guest_enter(void)
static inline void kvm_guest_exit(void)
{
account_system_vtime(current);
vtime_account(current);
current->flags &= ~PF_VCPU;
}

2
kernel/sched/core.c
View file

@ -1764,7 +1764,7 @@ static void finish_task_switch(struct rq *rq, struct task_struct *prev)
* Manfred Spraul <manfred@colorfullife.com>
*/
prev_state = prev->state;
account_switch_vtime(prev);
vtime_task_switch(prev);
finish_arch_switch(prev);
perf_event_task_sched_in(prev, current);
finish_lock_switch(rq, prev);

8
kernel/sched/cputime.c
View file

@ -10,11 +10,11 @@
/*
* There are no locks covering percpu hardirq/softirq time.
* They are only modified in account_system_vtime, on corresponding CPU
* They are only modified in vtime_account, on corresponding CPU
* with interrupts disabled. So, writes are safe.
* They are read and saved off onto struct rq in update_rq_clock().
* This may result in other CPU reading this CPU's irq time and can
* race with irq/account_system_vtime on this CPU. We would either get old
* race with irq/vtime_account on this CPU. We would either get old
* or new value with a side effect of accounting a slice of irq time to wrong
* task when irq is in progress while we read rq->clock. That is a worthy
* compromise in place of having locks on each irq in account_system_time.
@ -43,7 +43,7 @@ DEFINE_PER_CPU(seqcount_t, irq_time_seq);
* Called before incrementing preempt_count on {soft,}irq_enter
* and before decrementing preempt_count on {soft,}irq_exit.
*/
void account_system_vtime(struct task_struct *curr)
void vtime_account(struct task_struct *curr)
{
unsigned long flags;
s64 delta;
@ -73,7 +73,7 @@ void account_system_vtime(struct task_struct *curr)
irq_time_write_end();
local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(account_system_vtime);
EXPORT_SYMBOL_GPL(vtime_account);
static int irqtime_account_hi_update(void)
{

6
kernel/softirq.c
View file

@ -220,7 +220,7 @@ asmlinkage void __do_softirq(void)
current->flags &= ~PF_MEMALLOC;
pending = local_softirq_pending();
account_system_vtime(current);
vtime_account(current);
__local_bh_disable((unsigned long)__builtin_return_address(0),
SOFTIRQ_OFFSET);
@ -271,7 +271,7 @@ asmlinkage void __do_softirq(void)
lockdep_softirq_exit();
account_system_vtime(current);
vtime_account(current);
__local_bh_enable(SOFTIRQ_OFFSET);
tsk_restore_flags(current, old_flags, PF_MEMALLOC);
}
@ -340,7 +340,7 @@ static inline void invoke_softirq(void)
*/
void irq_exit(void)
{
account_system_vtime(current);
vtime_account(current);
trace_hardirq_exit();
sub_preempt_count(IRQ_EXIT_OFFSET);
if (!in_interrupt() && local_softirq_pending())