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/* sched_plugin.c -- core infrastructure for the scheduler plugin system
*
* This file includes the initialization of the plugin system, the no-op Linux
* scheduler plugin and some dummy functions.
*/
#include <linux/litmus.h>
#include <linux/sched_plugin.h>
/* These are the original Linux initialization functions.
* We replace them here with our initialization code and call them
* after setting up LITMUS.
*/
void linux_sched_init(void);
void linux_sched_init_smp(void);
int linux_migration_init(void);
/*************************************************************
* Dummy plugin functions *
*************************************************************/
void litmus_dummy_finish_switch(struct task_struct * prev)
{
}
int litmus_dummy_schedule(struct task_struct * prev,
struct task_struct** next,
runqueue_t* q)
{
return 0;
}
reschedule_check_t litmus_dummy_scheduler_tick(void)
{
return NO_RESCHED;
}
long litmus_dummy_prepare_task(struct task_struct *t)
{
return 0;
}
void litmus_dummy_wake_up_task(struct task_struct *task)
{
printk(KERN_WARNING "task %d: unhandled real-time wake up!\n",
task->pid);
}
void litmus_dummy_task_blocks(struct task_struct *task)
{
}
long litmus_dummy_tear_down(struct task_struct *task)
{
return 0;
}
int litmus_dummy_scheduler_setup(int cmd, void __user *parameter)
{
return -EPERM;
}
long litmus_dummy_sleep_next_period(void)
{
return -EPERM;
}
long litmus_dummy_inherit_priority(struct pi_semaphore *sem,
struct task_struct *new_owner)
{
return -EPERM;
}
long litmus_dummy_return_priority(struct pi_semaphore *sem)
{
return -EPERM;
}
long litmus_dummy_pi_block(struct pi_semaphore *sem,
struct task_struct *new_waiter)
{
return -EPERM;
}
/* The default scheduler plugin. It doesn't do anything and lets Linux do its
* job.
*/
sched_plugin_t linux_sched_plugin = {
.plugin_name = "Linux",
.ready_to_use = 1,
.scheduler_tick = litmus_dummy_scheduler_tick,
.prepare_task = litmus_dummy_prepare_task,
.tear_down = litmus_dummy_tear_down,
.wake_up_task = litmus_dummy_wake_up_task,
.task_blocks = litmus_dummy_task_blocks,
.sleep_next_period = litmus_dummy_sleep_next_period,
.shutdown_hook = 0,
.schedule = litmus_dummy_schedule,
.finish_switch = litmus_dummy_finish_switch,
.scheduler_setup = litmus_dummy_scheduler_setup,
.inherit_priority = litmus_dummy_inherit_priority,
.return_priority = litmus_dummy_return_priority,
.pi_block = litmus_dummy_pi_block
};
/*
* The reference to current plugin that is used to schedule tasks within
* the system. It stores references to actual function implementations
* Should be initialized by calling "init_***_plugin()"
*/
sched_plugin_t *curr_sched_plugin = &linux_sched_plugin;
/* At sched-init */
void __init sched_init(void)
{
printk("Entering custom sched init, plugin %s\n",
curr_sched_plugin->plugin_name);
/* Init tracing facility before plugin functions are called */
/* CLEANUP: reenable this if needed
pstats = INIT_PSTATS;
*/
/* Call linux sched init tasks */
linux_sched_init();
printk("Sched init complete\n");
}
void __init sched_init_smp(void)
{
printk("Entering custom SMP init, plugin %s\n",
curr_sched_plugin->plugin_name);
/* Call linux smp initializer */
linux_sched_init_smp();
/* Enable tracing facilities here */
/*
CLEANUP: Reenable if needed.
if (smp_processor_id() == 0) {
if (init_trace()) {
printk("Tracing disabled\n");
} else {
printk("Default tracing enabled\n");
}
} */
printk("Sched init SMP complete\n");
}
int __init migration_init(void)
{
printk("Entering migration init\n");
/* Call linux migration init as it was before */
return linux_migration_init();
}
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