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author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2011-12-19 18:23:15 (GMT) |
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committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2011-12-19 18:23:15 (GMT) |
commit | 612ef28a045efadb3a98d4492ead7806a146485d (patch) | |
tree | 05621c87b37e91c27b06d450d76adffe97ce9666 /kernel/sched/stop_task.c | |
parent | c3e0ef9a298e028a82ada28101ccd5cf64d209ee (diff) | |
parent | 07cde2608a3b5c66515363f1b53623b1536b9785 (diff) | |
download | linux-612ef28a045efadb3a98d4492ead7806a146485d.tar.xz |
Merge branch 'sched/core' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into cputime-tip
Conflicts:
drivers/cpufreq/cpufreq_conservative.c
drivers/cpufreq/cpufreq_ondemand.c
drivers/macintosh/rack-meter.c
fs/proc/stat.c
fs/proc/uptime.c
kernel/sched/core.c
Diffstat (limited to 'kernel/sched/stop_task.c')
-rw-r--r-- | kernel/sched/stop_task.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/kernel/sched/stop_task.c b/kernel/sched/stop_task.c new file mode 100644 index 0000000..7b386e8 --- /dev/null +++ b/kernel/sched/stop_task.c @@ -0,0 +1,108 @@ +#include "sched.h" + +/* + * stop-task scheduling class. + * + * The stop task is the highest priority task in the system, it preempts + * everything and will be preempted by nothing. + * + * See kernel/stop_machine.c + */ + +#ifdef CONFIG_SMP +static int +select_task_rq_stop(struct task_struct *p, int sd_flag, int flags) +{ + return task_cpu(p); /* stop tasks as never migrate */ +} +#endif /* CONFIG_SMP */ + +static void +check_preempt_curr_stop(struct rq *rq, struct task_struct *p, int flags) +{ + /* we're never preempted */ +} + +static struct task_struct *pick_next_task_stop(struct rq *rq) +{ + struct task_struct *stop = rq->stop; + + if (stop && stop->on_rq) + return stop; + + return NULL; +} + +static void +enqueue_task_stop(struct rq *rq, struct task_struct *p, int flags) +{ + inc_nr_running(rq); +} + +static void +dequeue_task_stop(struct rq *rq, struct task_struct *p, int flags) +{ + dec_nr_running(rq); +} + +static void yield_task_stop(struct rq *rq) +{ + BUG(); /* the stop task should never yield, its pointless. */ +} + +static void put_prev_task_stop(struct rq *rq, struct task_struct *prev) +{ +} + +static void task_tick_stop(struct rq *rq, struct task_struct *curr, int queued) +{ +} + +static void set_curr_task_stop(struct rq *rq) +{ +} + +static void switched_to_stop(struct rq *rq, struct task_struct *p) +{ + BUG(); /* its impossible to change to this class */ +} + +static void +prio_changed_stop(struct rq *rq, struct task_struct *p, int oldprio) +{ + BUG(); /* how!?, what priority? */ +} + +static unsigned int +get_rr_interval_stop(struct rq *rq, struct task_struct *task) +{ + return 0; +} + +/* + * Simple, special scheduling class for the per-CPU stop tasks: + */ +const struct sched_class stop_sched_class = { + .next = &rt_sched_class, + + .enqueue_task = enqueue_task_stop, + .dequeue_task = dequeue_task_stop, + .yield_task = yield_task_stop, + + .check_preempt_curr = check_preempt_curr_stop, + + .pick_next_task = pick_next_task_stop, + .put_prev_task = put_prev_task_stop, + +#ifdef CONFIG_SMP + .select_task_rq = select_task_rq_stop, +#endif + + .set_curr_task = set_curr_task_stop, + .task_tick = task_tick_stop, + + .get_rr_interval = get_rr_interval_stop, + + .prio_changed = prio_changed_stop, + .switched_to = switched_to_stop, +}; |