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-rw-r--r--kernel/sched/cpuacct.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/kernel/sched/cpuacct.c b/kernel/sched/cpuacct.c
index 48b5e9184dc..72bd971ea37 100644
--- a/kernel/sched/cpuacct.c
+++ b/kernel/sched/cpuacct.c
@@ -218,6 +218,29 @@ void cpuacct_charge(struct task_struct *tsk, u64 cputime)
rcu_read_unlock();
}
+/*
+ * Add user/system time to cpuacct.
+ *
+ * Note: it's the caller that updates the account of the root cgroup.
+ */
+void cpuacct_account_field(struct task_struct *p, int index, u64 val)
+{
+ struct kernel_cpustat *kcpustat;
+ struct cpuacct *ca;
+
+ if (unlikely(!cpuacct_subsys.active))
+ return;
+
+ rcu_read_lock();
+ ca = task_ca(p);
+ while (ca && (ca != &root_cpuacct)) {
+ kcpustat = this_cpu_ptr(ca->cpustat);
+ kcpustat->cpustat[index] += val;
+ ca = parent_ca(ca);
+ }
+ rcu_read_unlock();
+}
+
void __init cpuacct_init(void)
{
root_cpuacct.cpustat = &kernel_cpustat;