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Commit 178be793 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

sched: do not normalize kernel threads via SysRq-N 



do not normalize kernel threads via SysRq-N: the migration threads,
softlockup threads, etc. might be essential for the system to
function properly. So only zap user tasks.

pointed out by Andi Kleen.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 1666703a

kernel/sched.c

+7 −11
Original line number Diff line number Diff line
@@ -365,15 +365,6 @@ static inline int cpu_of(struct rq *rq) 
#endif

}



static inline int is_migration_thread(struct task_struct *p, struct rq *rq)

{

#ifdef CONFIG_SMP

	return p == rq->migration_thread;

#else

	return 0;

#endif

}



/*

 * Update the per-runqueue clock, as finegrained as the platform can give

 * us, but without assuming monotonicity, etc.:
@@ -6563,6 +6554,12 @@ void normalize_rt_tasks(void) 


	read_lock_irq(&tasklist_lock);

	do_each_thread(g, p) {

		/*

		 * Only normalize user tasks:

		 */

		if (!p->mm)

			continue;



		p->se.exec_start		= 0;

#ifdef CONFIG_SCHEDSTATS

		p->se.wait_start		= 0;
@@ -6584,7 +6581,6 @@ void normalize_rt_tasks(void) 
		spin_lock_irqsave(&p->pi_lock, flags);

		rq = __task_rq_lock(p);



		if (!is_migration_thread(p, rq))

		normalize_task(rq, p);



		__task_rq_unlock(rq);