1 files changed, 48 insertions, 0 deletions

diff --git a/include/linux/vtime.h b/include/linux/vtime.h
new file mode 100644
index 000000000000..ae30ab58431a
--- /dev/null
+++ b/include/linux/vtime.h
@@ -0,0 +1,48 @@
+#ifndef _LINUX_KERNEL_VTIME_H
+#define _LINUX_KERNEL_VTIME_H
+
+struct task_struct;
+
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+extern void vtime_task_switch(struct task_struct *prev);
+extern void vtime_account_system(struct task_struct *tsk);
+extern void vtime_account_system_irqsafe(struct task_struct *tsk);
+extern void vtime_account_idle(struct task_struct *tsk);
+extern void vtime_account_user(struct task_struct *tsk);
+extern void vtime_account(struct task_struct *tsk);
+#else
+static inline void vtime_task_switch(struct task_struct *prev) { }
+static inline void vtime_account_system(struct task_struct *tsk) { }
+static inline void vtime_account_system_irqsafe(struct task_struct *tsk) { }
+static inline void vtime_account(struct task_struct *tsk) { }
+#endif
+
+#ifdef CONFIG_IRQ_TIME_ACCOUNTING
+extern void irqtime_account_irq(struct task_struct *tsk);
+#else
+static inline void irqtime_account_irq(struct task_struct *tsk) { }
+#endif
+
+static inline void vtime_account_irq_enter(struct task_struct *tsk)
+{
+        /*
+         * Hardirq can interrupt idle task anytime. So we need vtime_account()
+         * that performs the idle check in CONFIG_VIRT_CPU_ACCOUNTING.
+         * Softirq can also interrupt idle task directly if it calls
+         * local_bh_enable(). Such case probably don't exist but we never know.
+         * Ksoftirqd is not concerned because idle time is flushed on context
+         * switch. Softirqs in the end of hardirqs are also not a problem because
+         * the idle time is flushed on hardirq time already.
+         */
+        vtime_account(tsk);
+        irqtime_account_irq(tsk);
+}
+
+static inline void vtime_account_irq_exit(struct task_struct *tsk)
+{
+        /* On hard|softirq exit we always account to hard|softirq cputime */
+        vtime_account_system(tsk);
+        irqtime_account_irq(tsk);
+}
+
+#endif /* _LINUX_KERNEL_VTIME_H */