Scheduler hooks to change which process is deemed to be on a cpu.
include/linux/sched.h | 2 ++
kernel/sched.c | 28 ++++++++++++++++++++++++++++
2 files changed, 30 insertions(+)
Index: linux/include/linux/sched.h
===================================================================
--- linux.orig/include/linux/sched.h 2005-08-01 11:49:17.130276812 +1000
+++ linux/include/linux/sched.h 2005-08-01 12:03:13.857267716 +1000
@@ -883,6 +883,8 @@ 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);
Index: linux/kernel/sched.c
===================================================================
--- linux.orig/kernel/sched.c 2005-08-01 11:49:19.642973411 +1000
+++ linux/kernel/sched.c 2005-08-01 12:03:13.860197405 +1000
@@ -3471,6 +3471,34 @@ task_t *idle_task(int cpu)
}
/**
+ * curr_task - return the current task for a given cpu.
+ * @cpu: the processor in question.
+ */
+task_t *curr_task(int cpu)
+{
+ return cpu_rq(cpu)->curr;
+}
+EXPORT_SYMBOL_GPL(curr_task);
+
+/**
+ * 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_rq(cpu)->curr = p;
+}
+EXPORT_SYMBOL_GPL(set_curr_task);
+
+/**
* find_process_by_pid - find a process with a matching PID value.
* @pid: the pid in question.
*/
-
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