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Some more cputime cleanups:

Browse source 
* Get rid of underscores polluting the vtime namespace
 
 * Consolidate context switch and tick handling
 
 * Improve debuggability by detecting irq unsafe callers
 
 Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
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Merge tag 'sched-cputime-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks into sched/core

Pull more cputime cleanups from Frederic Weisbecker:

 * Get rid of underscores polluting the vtime namespace

 * Consolidate context switch and tick handling

 * Improve debuggability by detecting irq unsafe callers

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2012-12-08 15:44:43 +01:00
commit 38130ec087
10 changed files with 65 additions and 55 deletions
Download patch file Download diff file Expand all files Collapse all files

31
kernel/sched/cputime.c
View file

@ -461,20 +461,33 @@ void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime
*st = cputime.stime;
}
void vtime_account_system(struct task_struct *tsk)
void vtime_account_system_irqsafe(struct task_struct *tsk)
{
unsigned long flags;
local_irq_save(flags);
__vtime_account_system(tsk);
vtime_account_system(tsk);
local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(vtime_account_system);
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
* __vtime_account_system() and __vtime_account_idle(). Archs that
* vtime_account_system() and vtime_account_idle(). Archs that
* have other meaning of the idle time (s390 only includes the
* time spent by the CPU when it's in low power mode) must override
* vtime_account().
@ -482,16 +495,10 @@ EXPORT_SYMBOL_GPL(vtime_account_system);
#ifndef __ARCH_HAS_VTIME_ACCOUNT
void vtime_account(struct task_struct *tsk)
{
unsigned long flags;
local_irq_save(flags);
if (in_interrupt() || !is_idle_task(tsk))
__vtime_account_system(tsk);
vtime_account_system(tsk);
else
__vtime_account_idle(tsk);
local_irq_restore(flags);
vtime_account_idle(tsk);
}
EXPORT_SYMBOL_GPL(vtime_account);
#endif /* __ARCH_HAS_VTIME_ACCOUNT */