sched: rt-group: reduce rescheduling

[linux-2.6] / kernel / fork.c

diff --git a/kernel/fork.c b/kernel/fork.c
index 8dd8ff2810095d9bab2e511e60dbfe2500ef8b90..0c969f4fade05391a8faaf6a2ff30ad1837861db 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1045,6 +1045,10 @@ static struct task_struct *copy_process(unsigned long clone_flags,
        copy_flags(clone_flags, p);
        INIT_LIST_HEAD(&p->children);
        INIT_LIST_HEAD(&p->sibling);
+#ifdef CONFIG_PREEMPT_RCU
+       p->rcu_read_lock_nesting = 0;
+       p->rcu_flipctr_idx = 0;
+#endif /* #ifdef CONFIG_PREEMPT_RCU */
        p->vfork_done = NULL;
        spin_lock_init(&p->alloc_lock);
 
@@ -1059,6 +1063,11 @@ static struct task_struct *copy_process(unsigned long clone_flags,
        p->prev_utime = cputime_zero;
        p->prev_stime = cputime_zero;
 
+#ifdef CONFIG_DETECT_SOFTLOCKUP
+       p->last_switch_count = 0;
+       p->last_switch_timestamp = 0;
+#endif
+
 #ifdef CONFIG_TASK_XACCT
        p->rchar = 0;           /* I/O counter: bytes read */
        p->wchar = 0;           /* I/O counter: bytes written */
@@ -1237,6 +1246,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         * parent's CPU). This avoids alot of nasty races.
         */
        p->cpus_allowed = current->cpus_allowed;
+       p->rt.nr_cpus_allowed = current->rt.nr_cpus_allowed;
        if (unlikely(!cpu_isset(task_cpu(p), p->cpus_allowed) ||
                        !cpu_online(task_cpu(p))))
                set_task_cpu(p, smp_processor_id());