posixtimers, sched: Fix posix clock monotonicity

[pandora-kernel.git] / kernel / sched.c

diff --git a/kernel/sched.c b/kernel/sched.c
index cc397aa..c8d7f17 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4139,9 +4139,25 @@ DEFINE_PER_CPU(struct kernel_stat, kstat);
 EXPORT_PER_CPU_SYMBOL(kstat);
 
 /*
- * Return any ns on the sched_clock that have not yet been banked in
+ * Return any ns on the sched_clock that have not yet been accounted in
  * @p in case that task is currently running.
+ *
+ * Called with task_rq_lock() held on @rq.
  */
+static u64 do_task_delta_exec(struct task_struct *p, struct rq *rq)
+{
+       u64 ns = 0;
+
+       if (task_current(rq, p)) {
+               update_rq_clock(rq);
+               ns = rq->clock - p->se.exec_start;
+               if ((s64)ns < 0)
+                       ns = 0;
+       }
+
+       return ns;
+}
+
 unsigned long long task_delta_exec(struct task_struct *p)
 {
        unsigned long flags;
@@ -4149,16 +4165,49 @@ unsigned long long task_delta_exec(struct task_struct *p)
        u64 ns = 0;
 
        rq = task_rq_lock(p, &flags);
+       ns = do_task_delta_exec(p, rq);
+       task_rq_unlock(rq, &flags);
 
-       if (task_current(rq, p)) {
-               u64 delta_exec;
+       return ns;
+}
 
-               update_rq_clock(rq);
-               delta_exec = rq->clock - p->se.exec_start;
-               if ((s64)delta_exec > 0)
-                       ns = delta_exec;
-       }
+/*
+ * Return accounted runtime for the task.
+ * In case the task is currently running, return the runtime plus current's
+ * pending runtime that have not been accounted yet.
+ */
+unsigned long long task_sched_runtime(struct task_struct *p)
+{
+       unsigned long flags;
+       struct rq *rq;
+       u64 ns = 0;
+
+       rq = task_rq_lock(p, &flags);
+       ns = p->se.sum_exec_runtime + do_task_delta_exec(p, rq);
+       task_rq_unlock(rq, &flags);
+
+       return ns;
+}
 
+/*
+ * Return sum_exec_runtime for the thread group.
+ * In case the task is currently running, return the sum plus current's
+ * pending runtime that have not been accounted yet.
+ *
+ * Note that the thread group might have other running tasks as well,
+ * so the return value not includes other pending runtime that other
+ * running tasks might have.
+ */
+unsigned long long thread_group_sched_runtime(struct task_struct *p)
+{
+       struct task_cputime totals;
+       unsigned long flags;
+       struct rq *rq;
+       u64 ns;
+
+       rq = task_rq_lock(p, &flags);
+       thread_group_cputime(p, &totals);
+       ns = totals.sum_exec_runtime + do_task_delta_exec(p, rq);
        task_rq_unlock(rq, &flags);
 
        return ns;