Commit e3942ba0 authored by Frederic Weisbecker's avatar Frederic Weisbecker
Browse files

vtime: Consolidate a bit the ctx switch code



On ia64 and powerpc, vtime context switch only consists
in flushing system and user pending time, plus a few
arch housekeeping.

Consolidate that into a generic implementation. s390 is
a special case because pending user and system time accounting
there is hard to dissociate. So it's keeping its own implementation.
Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Reviewed-by: default avatarSteven 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>
parent bcebdf84
......@@ -103,5 +103,7 @@ static inline void cputime_to_timeval(const cputime_t ct, struct timeval *val)
#define cputime64_to_clock_t(__ct) \
cputime_to_clock_t((__force cputime_t)__ct)
extern void arch_vtime_task_switch(struct task_struct *tsk);
#endif /* CONFIG_VIRT_CPU_ACCOUNTING */
#endif /* __IA64_CPUTIME_H */
......@@ -100,18 +100,11 @@ void vtime_account_user(struct task_struct *tsk)
* accumulated times to the current process, and to prepare accounting on
* the next process.
*/
void vtime_task_switch(struct task_struct *prev)
void arch_vtime_task_switch(struct task_struct *prev)
{
struct thread_info *pi = task_thread_info(prev);
struct thread_info *ni = task_thread_info(current);
if (idle_task(smp_processor_id()) != prev)
vtime_account_system(prev);
else
vtime_account_idle(prev);
vtime_account_user(prev);
pi->ac_stamp = ni->ac_stamp;
ni->ac_stime = ni->ac_utime = 0;
}
......
......@@ -228,6 +228,8 @@ static inline cputime_t clock_t_to_cputime(const unsigned long clk)
#define cputime64_to_clock_t(ct) cputime_to_clock_t((cputime_t)(ct))
static inline void arch_vtime_task_switch(struct task_struct *tsk) { }
#endif /* __KERNEL__ */
#endif /* CONFIG_VIRT_CPU_ACCOUNTING */
#endif /* __POWERPC_CPUTIME_H */
......@@ -375,12 +375,6 @@ void vtime_account_user(struct task_struct *tsk)
account_user_time(tsk, utime, utimescaled);
}
void vtime_task_switch(struct task_struct *prev)
{
vtime_account(prev);
vtime_account_user(prev);
}
#else /* ! CONFIG_VIRT_CPU_ACCOUNTING */
#define calc_cputime_factors()
#endif
......
......@@ -14,6 +14,7 @@
#define __ARCH_HAS_VTIME_ACCOUNT
#define __ARCH_HAS_VTIME_TASK_SWITCH
/* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */
......
......@@ -443,6 +443,19 @@ void vtime_account_system_irqsafe(struct task_struct *tsk)
}
EXPORT_SYMBOL_GPL(vtime_account_system_irqsafe);
#ifndef __ARCH_HAS_VTIME_TASK_SWITCH
void vtime_task_switch(struct task_struct *prev)
{
if (is_idle_task(prev))
vtime_account_idle(prev);
else
vtime_account_system(prev);
vtime_account_user(prev);
arch_vtime_task_switch(prev);
}
#endif
/*
* Archs that account the whole time spent in the idle task
* (outside irq) as idle time can rely on this and just implement
......
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment