xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

vtime: Optimize full dynticks accounting off case with static keys

Browse Source 
If no CPU is in the full dynticks range, we can avoid the full
dynticks cputime accounting through generic vtime along with its
overhead and use the traditional tick based accounting instead.

Let's do this and nope the off case with static keys.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Kevin Hilman <khilman@linaro.org>
This commit is contained in:
Frederic Weisbecker
2013-07-12 03:10:15 +02:00
parent a5725ac23b
commit b049340613
3 changed files with 67 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
kernel/sched/cputime.c
View File

@@ -378,11 +378,8 @@ static inline void irqtime_account_process_tick(struct task_struct *p, int user_
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
#ifndef __ARCH_HAS_VTIME_TASK_SWITCH
void vtime_task_switch(struct task_struct *prev)
void vtime_common_task_switch(struct task_struct *prev)
{
if (!vtime_accounting_enabled())
return;
if (is_idle_task(prev))
vtime_account_idle(prev);
else
@@ -404,11 +401,8 @@ void vtime_task_switch(struct task_struct *prev)
* vtime_account().
*/
#ifndef __ARCH_HAS_VTIME_ACCOUNT
void vtime_account_irq_enter(struct task_struct *tsk)
void vtime_common_account_irq_enter(struct task_struct *tsk)
{
if (!vtime_accounting_enabled())
return;
if (!in_interrupt()) {
/*
* If we interrupted user, context_tracking_in_user()
@@ -428,7 +422,7 @@ void vtime_account_irq_enter(struct task_struct *tsk)
}
vtime_account_system(tsk);
}
EXPORT_SYMBOL_GPL(vtime_account_irq_enter);
EXPORT_SYMBOL_GPL(vtime_common_account_irq_enter);
#endif /* __ARCH_HAS_VTIME_ACCOUNT */
#endif /* CONFIG_VIRT_CPU_ACCOUNTING */
@@ -669,11 +663,8 @@ void vtime_account_system(struct task_struct *tsk)
write_sequnlock(&tsk->vtime_seqlock);
}
void vtime_account_irq_exit(struct task_struct *tsk)
void vtime_gen_account_irq_exit(struct task_struct *tsk)
{
if (!vtime_accounting_enabled())
return;
write_seqlock(&tsk->vtime_seqlock);
if (context_tracking_in_user())
tsk->vtime_snap_whence = VTIME_USER;
@@ -732,11 +723,6 @@ void vtime_account_idle(struct task_struct *tsk)
account_idle_time(delta_cpu);
}
bool vtime_accounting_enabled(void)
{
return context_tracking_active();
}
void arch_vtime_task_switch(struct task_struct *prev)
{
write_seqlock(&prev->vtime_seqlock);