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[PATCH] MCA/INIT: scheduler hooks

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Scheduler hooks to see/change which process is deemed to be on a cpu.

Signed-off-by: Keith Owens <kaos@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Keith Owens 2005-09-11 17:19:06 +10:00 • committed by Tony Luck
parent 9fe66dfd88
commit a2a979821b
2 changed files with 28 additions and 0 deletions
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2
include/linux/sched.h
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@ -904,6 +904,8 @@ extern int task_curr(const task_t *p);
extern int idle_cpu(int cpu); extern int idle_cpu(int cpu);
extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
extern task_t *idle_task(int cpu); extern task_t *idle_task(int cpu);
extern task_t *curr_task(int cpu);
extern void set_curr_task(int cpu, task_t *p);
void yield(void); void yield(void);

26
kernel/sched.c
View file

@ -3576,6 +3576,32 @@ task_t *idle_task(int cpu)
return cpu_rq(cpu)->idle; return cpu_rq(cpu)->idle;
} }
/**
* curr_task - return the current task for a given cpu.
* @cpu: the processor in question.
*/
task_t *curr_task(int cpu)
{
return cpu_curr(cpu);
}
/**
* set_curr_task - set the current task for a given cpu.
* @cpu: the processor in question.
* @p: the task pointer to set.
*
* Description: This function must only be used when non-maskable interrupts
* are serviced on a separate stack. It allows the architecture to switch the
* notion of the current task on a cpu in a non-blocking manner. This function
* must be called with interrupts disabled, the caller must save the original
* value of the current task (see curr_task() above) and restore that value
* before reenabling interrupts.
*/
void set_curr_task(int cpu, task_t *p)
{
cpu_curr(cpu) = p;
}
/** /**
* find_process_by_pid - find a process with a matching PID value. * find_process_by_pid - find a process with a matching PID value.
* @pid: the pid in question. * @pid: the pid in question.