Commit a2a97982 authored by Keith Owens's avatar Keith Owens Committed by Tony Luck
Browse files

[PATCH] MCA/INIT: scheduler hooks 



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

Signed-off-by: default avatarKeith Owens <kaos@sgi.com>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent 9fe66dfd

include/linux/sched.h

+2 −0
Original line number Diff line number Diff line
@@ -904,6 +904,8 @@ extern int task_curr(const task_t *p); 
extern int idle_cpu(int cpu);

extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);

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);

kernel/sched.c

+26 −0
Original line number Diff line number Diff line
@@ -3576,6 +3576,32 @@ task_t *idle_task(int cpu) 
	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.

 * @pid: the pid in question.