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cputime: Separate irqtime accounting from generic vtime 

vtime_account() doesn't have the same role in
CONFIG_VIRT_CPU_ACCOUNTING and CONFIG_IRQ_TIME_ACCOUNTING.

In the first case it handles time accounting in any context. In
the second case it only handles irq time accounting.

So when vtime_account() is called from outside vtime_account_irq_*()
this call is pointless to CONFIG_IRQ_TIME_ACCOUNTING.

To fix the confusion, change vtime_account() to irqtime_account_irq()
in CONFIG_IRQ_TIME_ACCOUNTING. This way we ensure future account_vtime()
calls won't waste useless cycles in the irqtime APIs.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
This commit is contained in:
Frederic Weisbecker 2012-10-06 05:23:22 +02:00
parent fa5058f3b6
commit 3e1df4f506
2 changed files with 10 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
include/linux/vtime.h
View File

@ -8,17 +8,18 @@ extern void vtime_task_switch(struct task_struct *prev);
extern void __vtime_account_system(struct task_struct *tsk);
extern void vtime_account_system(struct task_struct *tsk);
extern void __vtime_account_idle(struct task_struct *tsk);
extern void vtime_account(struct task_struct *tsk);
#else
static inline void vtime_task_switch(struct task_struct *prev) { }
static inline void __vtime_account_system(struct task_struct *tsk) { }
static inline void vtime_account_system(struct task_struct *tsk) { }
static inline void vtime_account(struct task_struct *tsk) { }
#endif
#if !defined(CONFIG_VIRT_CPU_ACCOUNTING) && !defined(CONFIG_IRQ_TIME_ACCOUNTING)
static inline void vtime_account(struct task_struct *tsk)
{
}
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
extern void irqtime_account_irq(struct task_struct *tsk);
#else
extern void vtime_account(struct task_struct *tsk);
static inline void irqtime_account_irq(struct task_struct *tsk) { }
#endif
static inline void vtime_account_irq_enter(struct task_struct *tsk)
@ -33,17 +34,14 @@ static inline void vtime_account_irq_enter(struct task_struct *tsk)
* the idle time is flushed on hardirq time already.
*/
vtime_account(tsk);
irqtime_account_irq(tsk);
}
static inline void vtime_account_irq_exit(struct task_struct *tsk)
{
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
/* On hard|softirq exit we always account to hard|softirq cputime */
__vtime_account_system(tsk);
#endif
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
vtime_account(tsk);
#endif
irqtime_account_irq(tsk);
}
#endif /* _LINUX_KERNEL_VTIME_H */

4
kernel/sched/cputime.c
View File

@ -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 vtime_account(struct task_struct *curr)
void irqtime_account_irq(struct task_struct *curr)
{
unsigned long flags;
s64 delta;
@ -73,7 +73,7 @@ void vtime_account(struct task_struct *curr)
irq_time_write_end();
local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(vtime_account);
EXPORT_SYMBOL_GPL(irqtime_account_irq);
static int irqtime_account_hi_update(void)
{