vtime: Update a few comments (5b206d48) · Commits · 戴 / test

include/linux/context_tracking.h

+4 −6

Original line number	Diff line number	Diff line
		@@ -72,8 +72,9 @@ extern void guest_exit(void);
		static inline void guest_enter(void)
		{
		/*
		* This is running in ioctl context so we can avoid
		* the call to vtime_account() with its unnecessary idle check.
		* This is running in ioctl context so its safe
		* to assume that it's the stime pending cputime
		* to flush.
		*/
		vtime_account_system(current);
		current->flags \|= PF_VCPU;
		@@ -81,10 +82,7 @@ static inline void guest_enter(void)

		static inline void guest_exit(void)
		{
		/*
		* This is running in ioctl context so we can avoid
		* the call to vtime_account() with its unnecessary idle check.
		*/
		/* Flush the guest cputime we spent on the guest */
		vtime_account_system(current);
		current->flags &= ~PF_VCPU;
		}

+7 −0

Original line number	Diff line number	Diff line
		@@ -712,6 +712,13 @@ void vtime_user_enter(struct task_struct *tsk)

		void vtime_guest_enter(struct task_struct *tsk)
		{
		/*
		* The flags must be updated under the lock with
		* the vtime_snap flush and update.
		* That enforces a right ordering and update sequence
		* synchronization against the reader (task_gtime())
		* that can thus safely catch up with a tickless delta.
		*/
		write_seqlock(&tsk->vtime_seqlock);
		__vtime_account_system(tsk);
		current->flags \|= PF_VCPU;