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sched: Extend enqueue_task to allow head queueing

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The ability of enqueueing a task to the head of a SCHED_FIFO priority
list is required to fix some violations of POSIX scheduling policy.

Extend the related functions with a "head" argument.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Tested-by: Carsten Emde <cbe@osadl.org>
Tested-by: Mathias Weber <mathias.weber.mw1@roche.com>
LKML-Reference: <20100120171629.734886007@linutronix.de>
This commit is contained in:
Thomas Gleixner
2010-01-20 20:58:57 +00:00
parent 7c9414385e
commit ea87bb7853
4 changed files with 13 additions and 9 deletions
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3
include/linux/sched.h
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@@ -1067,7 +1067,8 @@ struct sched_domain;
struct sched_class {
const struct sched_class *next;
void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup,
bool head);
void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
void (*yield_task) (struct rq *rq);