From 94bc9a7bd97efdda4dfbe61d0df32ce19d41c0a9 Mon Sep 17 00:00:00 2001 From: Dmitry Adamushko Date: Thu, 15 Nov 2007 20:57:40 +0100 Subject: [PATCH] sched: remove activate_idle_task() cpu_down() code is ok wrt sched_idle_next() placing the 'idle' task not at the beginning of the queue. So get rid of activate_idle_task() and make use of activate_task() instead. It is the same as activate_task(), except for the update_rq_clock(rq) call that is redundant. Code size goes down: text data bss dec hex filename 47853 3934 336 52123 cb9b sched.o.before 47828 3934 336 52098 cb82 sched.o.after Signed-off-by: Dmitry Adamushko Signed-off-by: Ingo Molnar --- kernel/sched.c | 22 ++++------------------ 1 file changed, 4 insertions(+), 18 deletions(-) diff --git a/kernel/sched.c b/kernel/sched.c index db1f71e313..cc8cb6f7d8 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -5281,24 +5281,10 @@ static void migrate_live_tasks(int src_cpu) read_unlock(&tasklist_lock); } -/* - * activate_idle_task - move idle task to the _front_ of runqueue. - */ -static void activate_idle_task(struct task_struct *p, struct rq *rq) -{ - update_rq_clock(rq); - - if (p->state == TASK_UNINTERRUPTIBLE) - rq->nr_uninterruptible--; - - enqueue_task(rq, p, 0); - inc_nr_running(p, rq); -} - /* * Schedules idle task to be the next runnable task on current CPU. - * It does so by boosting its priority to highest possible and adding it to - * the _front_ of the runqueue. Used by CPU offline code. + * It does so by boosting its priority to highest possible. + * Used by CPU offline code. */ void sched_idle_next(void) { @@ -5318,8 +5304,8 @@ void sched_idle_next(void) __setscheduler(rq, p, SCHED_FIFO, MAX_RT_PRIO-1); - /* Add idle task to the _front_ of its priority queue: */ - activate_idle_task(p, rq); + update_rq_clock(rq); + activate_task(rq, p, 0); spin_unlock_irqrestore(&rq->lock, flags); } -- 2.39.5