split the slow path in acct_process() off (e25ff11f) · Commits · e / devices / android_kernel_oneplus_sm8150

kernel/acct.c

+28 −22

Original line number	Diff line number	Diff line
		@@ -599,8 +599,9 @@ void acct_collect(long exitcode, int group_dead)
		spin_unlock_irq(&current->sighand->siglock);
		}

		static void acct_process_in_ns(struct pid_namespace *ns)
		static void slow_acct_process(struct pid_namespace *ns)
		{
		for ( ; ns; ns = ns->parent) {
		struct file *file = NULL;
		struct bsd_acct_struct *acct;

		@@ -609,13 +610,13 @@ static void acct_process_in_ns(struct pid_namespace *ns)
		* accelerate the common fastpath:
		*/
		if (!acct \|\| !acct->file)
		return;
		continue;

		spin_lock(&acct_lock);
		file = acct->file;
		if (unlikely(!file)) {
		spin_unlock(&acct_lock);
		return;
		continue;
		}
		get_file(file);
		spin_unlock(&acct_lock);
		@@ -623,10 +624,10 @@ static void acct_process_in_ns(struct pid_namespace *ns)
		do_acct_process(acct, ns, file);
		fput(file);
		}
		}

		/**
		* acct_process - now just a wrapper around acct_process_in_ns,
		* which in turn is a wrapper around do_acct_process.
		* acct_process
		*
		* handles process accounting for an exiting task
		*/
		@@ -639,6 +640,11 @@ void acct_process(void)
		* alive and holds its namespace, which in turn holds
		* its parent.
		*/
		for (ns = task_active_pid_ns(current); ns != NULL; ns = ns->parent)
		acct_process_in_ns(ns);
		for (ns = task_active_pid_ns(current); ns != NULL; ns = ns->parent) {
		struct bsd_acct_struct *acct = ns->bacct;
		if (acct && acct->file)
		break;
		}
		if (unlikely(ns))
		slow_acct_process(ns);
		}