linux-kernel - [PATCH 1/9] sched: add schedule_timeout

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Message-Id: <1458644426-22973-2-git-send-email-mhocko@kernel.org>
Date:	Tue, 22 Mar 2016 12:00:18 +0100
From:	Michal Hocko <mhocko@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	<linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	David Rientjes <rientjes@...gle.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [PATCH 1/9] sched: add schedule_timeout_idle()

From: Andrew Morton <akpm@...ux-foundation.org>

This will be needed in the patch "mm, oom: introduce oom reaper".

Acked-by: Michal Hocko <mhocko@...e.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---
 include/linux/sched.h |  1 +
 kernel/time/timer.c   | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 084ed9fba620..9cf5731472fe 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -425,6 +425,7 @@ extern signed long schedule_timeout(signed long timeout);
 extern signed long schedule_timeout_interruptible(signed long timeout);
 extern signed long schedule_timeout_killable(signed long timeout);
 extern signed long schedule_timeout_uninterruptible(signed long timeout);
+extern signed long schedule_timeout_idle(signed long timeout);
 asmlinkage void schedule(void);
 extern void schedule_preempt_disabled(void);
 
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index d1798fa0c743..73164c3aa56b 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1566,6 +1566,17 @@ signed long __sched schedule_timeout_uninterruptible(signed long timeout)
 }
 EXPORT_SYMBOL(schedule_timeout_uninterruptible);
 
+/*
+ * Like schedule_timeout_uninterruptible(), except this task will not contribute
+ * to load average.
+ */
+signed long __sched schedule_timeout_idle(signed long timeout)
+{
+	__set_current_state(TASK_IDLE);
+	return schedule_timeout(timeout);
+}
+EXPORT_SYMBOL(schedule_timeout_idle);
+
 #ifdef CONFIG_HOTPLUG_CPU
 static void migrate_timer_list(struct tvec_base *new_base, struct hlist_head *head)
 {
-- 
2.7.0