aboutsummaryrefslogtreecommitdiffstats
path: root/kernel/sched_autogroup.c
diff options
context:
space:
mode:
authorPeter Zijlstra <a.p.zijlstra@chello.nl>2011-11-15 17:14:39 +0100
committerIngo Molnar <mingo@elte.hu>2011-11-17 12:20:22 +0100
commit391e43da797a96aeb65410281891f6d0b0e9611c (patch)
tree0ce6784525a5a8f75b377170cf1a7d60abccea29 /kernel/sched_autogroup.c
parent029632fbb7b7c9d85063cc9eb470de6c54873df3 (diff)
sched: Move all scheduler bits into kernel/sched/
There's too many sched*.[ch] files in kernel/, give them their own directory. (No code changed, other than Makefile glue added.) Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_autogroup.c')
-rw-r--r--kernel/sched_autogroup.c258
1 files changed, 0 insertions, 258 deletions
diff --git a/kernel/sched_autogroup.c b/kernel/sched_autogroup.c
deleted file mode 100644
index e8a1f83ee0e..00000000000
--- a/kernel/sched_autogroup.c
+++ /dev/null
@@ -1,258 +0,0 @@
-#ifdef CONFIG_SCHED_AUTOGROUP
-
-#include "sched.h"
-
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-#include <linux/kallsyms.h>
-#include <linux/utsname.h>
-#include <linux/security.h>
-#include <linux/export.h>
-
-unsigned int __read_mostly sysctl_sched_autogroup_enabled = 1;
-static struct autogroup autogroup_default;
-static atomic_t autogroup_seq_nr;
-
-void __init autogroup_init(struct task_struct *init_task)
-{
- autogroup_default.tg = &root_task_group;
- kref_init(&autogroup_default.kref);
- init_rwsem(&autogroup_default.lock);
- init_task->signal->autogroup = &autogroup_default;
-}
-
-void autogroup_free(struct task_group *tg)
-{
- kfree(tg->autogroup);
-}
-
-static inline void autogroup_destroy(struct kref *kref)
-{
- struct autogroup *ag = container_of(kref, struct autogroup, kref);
-
-#ifdef CONFIG_RT_GROUP_SCHED
- /* We've redirected RT tasks to the root task group... */
- ag->tg->rt_se = NULL;
- ag->tg->rt_rq = NULL;
-#endif
- sched_destroy_group(ag->tg);
-}
-
-static inline void autogroup_kref_put(struct autogroup *ag)
-{
- kref_put(&ag->kref, autogroup_destroy);
-}
-
-static inline struct autogroup *autogroup_kref_get(struct autogroup *ag)
-{
- kref_get(&ag->kref);
- return ag;
-}
-
-static inline struct autogroup *autogroup_task_get(struct task_struct *p)
-{
- struct autogroup *ag;
- unsigned long flags;
-
- if (!lock_task_sighand(p, &flags))
- return autogroup_kref_get(&autogroup_default);
-
- ag = autogroup_kref_get(p->signal->autogroup);
- unlock_task_sighand(p, &flags);
-
- return ag;
-}
-
-static inline struct autogroup *autogroup_create(void)
-{
- struct autogroup *ag = kzalloc(sizeof(*ag), GFP_KERNEL);
- struct task_group *tg;
-
- if (!ag)
- goto out_fail;
-
- tg = sched_create_group(&root_task_group);
-
- if (IS_ERR(tg))
- goto out_free;
-
- kref_init(&ag->kref);
- init_rwsem(&ag->lock);
- ag->id = atomic_inc_return(&autogroup_seq_nr);
- ag->tg = tg;
-#ifdef CONFIG_RT_GROUP_SCHED
- /*
- * Autogroup RT tasks are redirected to the root task group
- * so we don't have to move tasks around upon policy change,
- * or flail around trying to allocate bandwidth on the fly.
- * A bandwidth exception in __sched_setscheduler() allows
- * the policy change to proceed. Thereafter, task_group()
- * returns &root_task_group, so zero bandwidth is required.
- */
- free_rt_sched_group(tg);
- tg->rt_se = root_task_group.rt_se;
- tg->rt_rq = root_task_group.rt_rq;
-#endif
- tg->autogroup = ag;
-
- return ag;
-
-out_free:
- kfree(ag);
-out_fail:
- if (printk_ratelimit()) {
- printk(KERN_WARNING "autogroup_create: %s failure.\n",
- ag ? "sched_create_group()" : "kmalloc()");
- }
-
- return autogroup_kref_get(&autogroup_default);
-}
-
-bool task_wants_autogroup(struct task_struct *p, struct task_group *tg)
-{
- if (tg != &root_task_group)
- return false;
-
- if (p->sched_class != &fair_sched_class)
- return false;
-
- /*
- * We can only assume the task group can't go away on us if
- * autogroup_move_group() can see us on ->thread_group list.
- */
- if (p->flags & PF_EXITING)
- return false;
-
- return true;
-}
-
-static void
-autogroup_move_group(struct task_struct *p, struct autogroup *ag)
-{
- struct autogroup *prev;
- struct task_struct *t;
- unsigned long flags;
-
- BUG_ON(!lock_task_sighand(p, &flags));
-
- prev = p->signal->autogroup;
- if (prev == ag) {
- unlock_task_sighand(p, &flags);
- return;
- }
-
- p->signal->autogroup = autogroup_kref_get(ag);
-
- if (!ACCESS_ONCE(sysctl_sched_autogroup_enabled))
- goto out;
-
- t = p;
- do {
- sched_move_task(t);
- } while_each_thread(p, t);
-
-out:
- unlock_task_sighand(p, &flags);
- autogroup_kref_put(prev);
-}
-
-/* Allocates GFP_KERNEL, cannot be called under any spinlock */
-void sched_autogroup_create_attach(struct task_struct *p)
-{
- struct autogroup *ag = autogroup_create();
-
- autogroup_move_group(p, ag);
- /* drop extra reference added by autogroup_create() */
- autogroup_kref_put(ag);
-}
-EXPORT_SYMBOL(sched_autogroup_create_attach);
-
-/* Cannot be called under siglock. Currently has no users */
-void sched_autogroup_detach(struct task_struct *p)
-{
- autogroup_move_group(p, &autogroup_default);
-}
-EXPORT_SYMBOL(sched_autogroup_detach);
-
-void sched_autogroup_fork(struct signal_struct *sig)
-{
- sig->autogroup = autogroup_task_get(current);
-}
-
-void sched_autogroup_exit(struct signal_struct *sig)
-{
- autogroup_kref_put(sig->autogroup);
-}
-
-static int __init setup_autogroup(char *str)
-{
- sysctl_sched_autogroup_enabled = 0;
-
- return 1;
-}
-
-__setup("noautogroup", setup_autogroup);
-
-#ifdef CONFIG_PROC_FS
-
-int proc_sched_autogroup_set_nice(struct task_struct *p, int *nice)
-{
- static unsigned long next = INITIAL_JIFFIES;
- struct autogroup *ag;
- int err;
-
- if (*nice < -20 || *nice > 19)
- return -EINVAL;
-
- err = security_task_setnice(current, *nice);
- if (err)
- return err;
-
- if (*nice < 0 && !can_nice(current, *nice))
- return -EPERM;
-
- /* this is a heavy operation taking global locks.. */
- if (!capable(CAP_SYS_ADMIN) && time_before(jiffies, next))
- return -EAGAIN;
-
- next = HZ / 10 + jiffies;
- ag = autogroup_task_get(p);
-
- down_write(&ag->lock);
- err = sched_group_set_shares(ag->tg, prio_to_weight[*nice + 20]);
- if (!err)
- ag->nice = *nice;
- up_write(&ag->lock);
-
- autogroup_kref_put(ag);
-
- return err;
-}
-
-void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m)
-{
- struct autogroup *ag = autogroup_task_get(p);
-
- if (!task_group_is_autogroup(ag->tg))
- goto out;
-
- down_read(&ag->lock);
- seq_printf(m, "/autogroup-%ld nice %d\n", ag->id, ag->nice);
- up_read(&ag->lock);
-
-out:
- autogroup_kref_put(ag);
-}
-#endif /* CONFIG_PROC_FS */
-
-#ifdef CONFIG_SCHED_DEBUG
-int autogroup_path(struct task_group *tg, char *buf, int buflen)
-{
- if (!task_group_is_autogroup(tg))
- return 0;
-
- return snprintf(buf, buflen, "%s-%ld", "/autogroup", tg->autogroup->id);
-}
-#endif /* CONFIG_SCHED_DEBUG */
-
-#endif /* CONFIG_SCHED_AUTOGROUP */