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vtime: Explicitly account pending user time on process tick

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All vtime implementations just flush the user time on process
tick. Consolidate that in generic code by calling a user time
accounting helper. This avoids an indirect call in ia64 and
prepare to also consolidate vtime context switch code.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
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>
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: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Frederic Weisbecker 2012-11-13 23:51:06 +01:00
parent fd25b4c2f2
commit bcebdf8465
5 changed files with 23 additions and 18 deletions
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11
arch/ia64/kernel/time.c
View file

@ -83,7 +83,7 @@ static struct clocksource *itc_clocksource;
extern cputime_t cycle_to_cputime(u64 cyc);
static void vtime_account_user(struct task_struct *tsk)
void vtime_account_user(struct task_struct *tsk)
{
cputime_t delta_utime;
struct thread_info *ti = task_thread_info(tsk);
@ -147,15 +147,6 @@ void vtime_account_idle(struct task_struct *tsk)
account_idle_time(vtime_delta(tsk));
}
/*
* Called from the timer interrupt handler to charge accumulated user time
* to the current process. Must be called with interrupts disabled.
*/
void account_process_tick(struct task_struct *p, int user_tick)
{
vtime_account_user(p);
}
#endif /* CONFIG_VIRT_CPU_ACCOUNTING */
static irqreturn_t

14
arch/powerpc/kernel/time.c
View file

@ -355,15 +355,15 @@ void vtime_account_idle(struct task_struct *tsk)
}
/*
* 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.
* Transfer the user time accumulated in the paca
* by the exception entry and exit code to the generic
* process user time records.
* Must be called with interrupts disabled.
* Assumes that vtime_account() has been called recently
* (i.e. since the last entry from usermode) so that
* Assumes that vtime_account_system/idle() has been called
* recently (i.e. since the last entry from usermode) so that
* get_paca()->user_time_scaled is up to date.
*/
void account_process_tick(struct task_struct *tsk, int user_tick)
void vtime_account_user(struct task_struct *tsk)
{
cputime_t utime, utimescaled;
@ -378,7 +378,7 @@ void account_process_tick(struct task_struct *tsk, int user_tick)
void vtime_task_switch(struct task_struct *prev)
{
vtime_account(prev);
account_process_tick(prev, 0);
vtime_account_user(prev);
}
#else /* ! CONFIG_VIRT_CPU_ACCOUNTING */

7
arch/s390/kernel/vtime.c
View file

@ -112,7 +112,12 @@ void vtime_task_switch(struct task_struct *prev)
S390_lowcore.system_timer = ti->system_timer;
}
void account_process_tick(struct task_struct *tsk, int user_tick)
/*
* In s390, accounting pending user time also implies
* accounting system time in order to correctly compute
* the stolen time accounting.
*/
void vtime_account_user(struct task_struct *tsk)
{
if (do_account_vtime(tsk, HARDIRQ_OFFSET))
virt_timer_expire();

8
include/linux/kernel_stat.h
View file

@ -127,7 +127,15 @@ extern void account_system_time(struct task_struct *, int, cputime_t, cputime_t)
extern void account_steal_time(cputime_t);
extern void account_idle_time(cputime_t);
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
static inline void account_process_tick(struct task_struct *tsk, int user)
{
vtime_account_user(tsk);
}
#else
extern void account_process_tick(struct task_struct *, int user);
#endif
extern void account_steal_ticks(unsigned long ticks);
extern void account_idle_ticks(unsigned long ticks);

1
include/linux/vtime.h
View file

@ -8,6 +8,7 @@ extern void vtime_task_switch(struct task_struct *prev);
extern void vtime_account_system(struct task_struct *tsk);
extern void vtime_account_system_irqsafe(struct task_struct *tsk);
extern void vtime_account_idle(struct task_struct *tsk);
extern void vtime_account_user(struct task_struct *tsk);
extern void vtime_account(struct task_struct *tsk);
#else
static inline void vtime_task_switch(struct task_struct *prev) { }