+/*
+ * The following are functions that support scheduler-internal time accounting.
+ * These functions are generally called at the timer tick. None of this depends
+ * on CONFIG_SCHEDSTATS.
+ */
+
+/**
+ * account_group_user_time - Maintain utime for a thread group.
+ *
+ * @tsk: Pointer to task structure.
+ * @cputime: Time value by which to increment the utime field of the
+ * thread_group_cputime structure.
+ *
+ * If thread group time is being maintained, get the structure for the
+ * running CPU and update the utime field there.
+ */
+static inline void account_group_user_time(struct task_struct *tsk,
+ cputime_t cputime)
+{
+ struct signal_struct *sig;
+
+ sig = tsk->signal;
+ if (unlikely(!sig))
+ return;
+ if (sig->cputime.totals) {
+ struct task_cputime *times;
+
+ times = per_cpu_ptr(sig->cputime.totals, get_cpu());
+ times->utime = cputime_add(times->utime, cputime);
+ put_cpu_no_resched();
+ }
+}
+
+/**
+ * account_group_system_time - Maintain stime for a thread group.
+ *
+ * @tsk: Pointer to task structure.
+ * @cputime: Time value by which to increment the stime field of the
+ * thread_group_cputime structure.
+ *
+ * If thread group time is being maintained, get the structure for the
+ * running CPU and update the stime field there.
+ */
+static inline void account_group_system_time(struct task_struct *tsk,
+ cputime_t cputime)
+{
+ struct signal_struct *sig;
+
+ sig = tsk->signal;
+ if (unlikely(!sig))
+ return;
+ if (sig->cputime.totals) {
+ struct task_cputime *times;
+
+ times = per_cpu_ptr(sig->cputime.totals, get_cpu());
+ times->stime = cputime_add(times->stime, cputime);
+ put_cpu_no_resched();
+ }
+}
+
+/**
+ * account_group_exec_runtime - Maintain exec runtime for a thread group.
+ *
+ * @tsk: Pointer to task structure.
+ * @ns: Time value by which to increment the sum_exec_runtime field
+ * of the thread_group_cputime structure.
+ *
+ * If thread group time is being maintained, get the structure for the
+ * running CPU and update the sum_exec_runtime field there.
+ */
+static inline void account_group_exec_runtime(struct task_struct *tsk,
+ unsigned long long ns)
+{
+ struct signal_struct *sig;
+
+ sig = tsk->signal;
+ if (unlikely(!sig))
+ return;
+ if (sig->cputime.totals) {
+ struct task_cputime *times;
+
+ times = per_cpu_ptr(sig->cputime.totals, get_cpu());
+ times->sum_exec_runtime += ns;
+ put_cpu_no_resched();
+ }
+}