sched: add fair-user scheduler

[powerpc.git] / kernel / user.c

diff --git a/kernel/user.c b/kernel/user.c
index 9ca2848..c6387fa 100644 (file)
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -50,8 +50,41 @@ struct user_struct root_user = {
        .uid_keyring    = &root_user_keyring,
        .session_keyring = &root_session_keyring,
 #endif
+#ifdef CONFIG_FAIR_USER_SCHED
+       .tg             = &init_task_grp,
+#endif
 };
 
+#ifdef CONFIG_FAIR_USER_SCHED
+static void sched_destroy_user(struct user_struct *up)
+{
+       sched_destroy_group(up->tg);
+}
+
+static int sched_create_user(struct user_struct *up)
+{
+       int rc = 0;
+
+       up->tg = sched_create_group();
+       if (IS_ERR(up->tg))
+               rc = -ENOMEM;
+
+       return rc;
+}
+
+static void sched_switch_user(struct task_struct *p)
+{
+       sched_move_task(p);
+}
+
+#else  /* CONFIG_FAIR_USER_SCHED */
+
+static void sched_destroy_user(struct user_struct *up) { }
+static int sched_create_user(struct user_struct *up) { return 0; }
+static void sched_switch_user(struct task_struct *p) { }
+
+#endif /* CONFIG_FAIR_USER_SCHED */
+
 /*
  * These routines must be called with the uidhash spinlock held!
  */
@@ -109,6 +142,7 @@ void free_uid(struct user_struct *up)
        if (atomic_dec_and_lock(&up->__count, &uidhash_lock)) {
                uid_hash_remove(up);
                spin_unlock_irqrestore(&uidhash_lock, flags);
+               sched_destroy_user(up);
                key_put(up->uid_keyring);
                key_put(up->session_keyring);
                kmem_cache_free(uid_cachep, up);
@@ -150,6 +184,13 @@ struct user_struct * alloc_uid(struct user_namespace *ns, uid_t uid)
                        return NULL;
                }
 
+               if (sched_create_user(new) < 0) {
+                       key_put(new->uid_keyring);
+                       key_put(new->session_keyring);
+                       kmem_cache_free(uid_cachep, new);
+                       return NULL;
+               }
+
                /*
                 * Before adding this, check whether we raced
                 * on adding the same user already..
@@ -157,6 +198,7 @@ struct user_struct * alloc_uid(struct user_namespace *ns, uid_t uid)
                spin_lock_irq(&uidhash_lock);
                up = uid_hash_find(uid, hashent);
                if (up) {
+                       sched_destroy_user(new);
                        key_put(new->uid_keyring);
                        key_put(new->session_keyring);
                        kmem_cache_free(uid_cachep, new);
@@ -184,6 +226,7 @@ void switch_uid(struct user_struct *new_user)
        atomic_dec(&old_user->processes);
        switch_uid_keyring(new_user);
        current->user = new_user;
+       sched_switch_user(current);
 
        /*
         * We need to synchronize with __sigqueue_alloc()