mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 13:13:57 +08:00
sched/idle: Move cpu/idle.c to sched/idle.c
Integration of cpuidle with the scheduler requires that the idle loop be closely integrated with the scheduler proper. Moving cpu/idle.c into the sched directory will allow for a smoother integration, and eliminate a subdirectory which contained only one source file. Signed-off-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/alpine.LFD.2.11.1401301102210.1652@knanqh.ubzr Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
parent
16f8b05abe
commit
cf37b6b484
@ -22,7 +22,6 @@ obj-y += sched/
|
||||
obj-y += locking/
|
||||
obj-y += power/
|
||||
obj-y += printk/
|
||||
obj-y += cpu/
|
||||
obj-y += irq/
|
||||
obj-y += rcu/
|
||||
|
||||
|
@ -1 +0,0 @@
|
||||
obj-y = idle.o
|
@ -13,7 +13,7 @@ endif
|
||||
|
||||
obj-y += core.o proc.o clock.o cputime.o
|
||||
obj-y += idle_task.o fair.o rt.o deadline.o stop_task.o
|
||||
obj-y += wait.o completion.o
|
||||
obj-y += wait.o completion.o idle.o
|
||||
obj-$(CONFIG_SMP) += cpupri.o cpudeadline.o
|
||||
obj-$(CONFIG_SCHED_AUTOGROUP) += auto_group.o
|
||||
obj-$(CONFIG_SCHEDSTATS) += stats.o
|
||||
|
144
kernel/sched/idle.c
Normal file
144
kernel/sched/idle.c
Normal file
@ -0,0 +1,144 @@
|
||||
/*
|
||||
* Generic entry point for the idle threads
|
||||
*/
|
||||
#include <linux/sched.h>
|
||||
#include <linux/cpu.h>
|
||||
#include <linux/cpuidle.h>
|
||||
#include <linux/tick.h>
|
||||
#include <linux/mm.h>
|
||||
#include <linux/stackprotector.h>
|
||||
|
||||
#include <asm/tlb.h>
|
||||
|
||||
#include <trace/events/power.h>
|
||||
|
||||
static int __read_mostly cpu_idle_force_poll;
|
||||
|
||||
void cpu_idle_poll_ctrl(bool enable)
|
||||
{
|
||||
if (enable) {
|
||||
cpu_idle_force_poll++;
|
||||
} else {
|
||||
cpu_idle_force_poll--;
|
||||
WARN_ON_ONCE(cpu_idle_force_poll < 0);
|
||||
}
|
||||
}
|
||||
|
||||
#ifdef CONFIG_GENERIC_IDLE_POLL_SETUP
|
||||
static int __init cpu_idle_poll_setup(char *__unused)
|
||||
{
|
||||
cpu_idle_force_poll = 1;
|
||||
return 1;
|
||||
}
|
||||
__setup("nohlt", cpu_idle_poll_setup);
|
||||
|
||||
static int __init cpu_idle_nopoll_setup(char *__unused)
|
||||
{
|
||||
cpu_idle_force_poll = 0;
|
||||
return 1;
|
||||
}
|
||||
__setup("hlt", cpu_idle_nopoll_setup);
|
||||
#endif
|
||||
|
||||
static inline int cpu_idle_poll(void)
|
||||
{
|
||||
rcu_idle_enter();
|
||||
trace_cpu_idle_rcuidle(0, smp_processor_id());
|
||||
local_irq_enable();
|
||||
while (!tif_need_resched())
|
||||
cpu_relax();
|
||||
trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
|
||||
rcu_idle_exit();
|
||||
return 1;
|
||||
}
|
||||
|
||||
/* Weak implementations for optional arch specific functions */
|
||||
void __weak arch_cpu_idle_prepare(void) { }
|
||||
void __weak arch_cpu_idle_enter(void) { }
|
||||
void __weak arch_cpu_idle_exit(void) { }
|
||||
void __weak arch_cpu_idle_dead(void) { }
|
||||
void __weak arch_cpu_idle(void)
|
||||
{
|
||||
cpu_idle_force_poll = 1;
|
||||
local_irq_enable();
|
||||
}
|
||||
|
||||
/*
|
||||
* Generic idle loop implementation
|
||||
*/
|
||||
static void cpu_idle_loop(void)
|
||||
{
|
||||
while (1) {
|
||||
tick_nohz_idle_enter();
|
||||
|
||||
while (!need_resched()) {
|
||||
check_pgt_cache();
|
||||
rmb();
|
||||
|
||||
if (cpu_is_offline(smp_processor_id()))
|
||||
arch_cpu_idle_dead();
|
||||
|
||||
local_irq_disable();
|
||||
arch_cpu_idle_enter();
|
||||
|
||||
/*
|
||||
* In poll mode we reenable interrupts and spin.
|
||||
*
|
||||
* Also if we detected in the wakeup from idle
|
||||
* path that the tick broadcast device expired
|
||||
* for us, we don't want to go deep idle as we
|
||||
* know that the IPI is going to arrive right
|
||||
* away
|
||||
*/
|
||||
if (cpu_idle_force_poll || tick_check_broadcast_expired()) {
|
||||
cpu_idle_poll();
|
||||
} else {
|
||||
if (!current_clr_polling_and_test()) {
|
||||
stop_critical_timings();
|
||||
rcu_idle_enter();
|
||||
if (cpuidle_idle_call())
|
||||
arch_cpu_idle();
|
||||
if (WARN_ON_ONCE(irqs_disabled()))
|
||||
local_irq_enable();
|
||||
rcu_idle_exit();
|
||||
start_critical_timings();
|
||||
} else {
|
||||
local_irq_enable();
|
||||
}
|
||||
__current_set_polling();
|
||||
}
|
||||
arch_cpu_idle_exit();
|
||||
/*
|
||||
* We need to test and propagate the TIF_NEED_RESCHED
|
||||
* bit here because we might not have send the
|
||||
* reschedule IPI to idle tasks.
|
||||
*/
|
||||
if (tif_need_resched())
|
||||
set_preempt_need_resched();
|
||||
}
|
||||
tick_nohz_idle_exit();
|
||||
schedule_preempt_disabled();
|
||||
}
|
||||
}
|
||||
|
||||
void cpu_startup_entry(enum cpuhp_state state)
|
||||
{
|
||||
/*
|
||||
* This #ifdef needs to die, but it's too late in the cycle to
|
||||
* make this generic (arm and sh have never invoked the canary
|
||||
* init for the non boot cpus!). Will be fixed in 3.11
|
||||
*/
|
||||
#ifdef CONFIG_X86
|
||||
/*
|
||||
* If we're the non-boot CPU, nothing set the stack canary up
|
||||
* for us. The boot CPU already has it initialized but no harm
|
||||
* in doing it again. This is a good place for updating it, as
|
||||
* we wont ever return from this function (so the invalid
|
||||
* canaries already on the stack wont ever trigger).
|
||||
*/
|
||||
boot_init_stack_canary();
|
||||
#endif
|
||||
__current_set_polling();
|
||||
arch_cpu_idle_prepare();
|
||||
cpu_idle_loop();
|
||||
}
|
Loading…
Reference in New Issue
Block a user