linux-kernel - [RFC v2 1/2] swait: add idle variants which don't contribute to load average

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Date:   Thu, 15 Jun 2017 11:48:19 -0700
From:   "Luis R. Rodriguez" <mcgrof@...nel.org>
To:     peterz@...radead.org, paulmck@...ux.vnet.ibm.com, oleg@...hat.com,
        josh@...htriplett.org, rostedt@...dmis.org,
        mathieu.desnoyers@...icios.com, jiangshanlai@...il.com
Cc:     paul.gortmaker@...driver.com, ebiederm@...ssion.com,
        dmitry.torokhov@...il.com, linux-kernel@...r.kernel.org,
        "Luis R. Rodriguez" <mcgrof@...nel.org>
Subject: [RFC v2 1/2] swait: add idle variants which don't contribute to load average

There are cases where folks are using an interruptible swait when
using kthreads. This is rather confusing given you'd expect
interruptible waits to be -- interruptible, but kthreads are not
interruptible ! The reason for such practice though is to avoid
having these kthreads contribute to the system load average.

When systems are idle some kthreads may spend a lot of time blocking if
using swait_event_timeout(). This would contribute to the system load
average. On systems without preemption this would mean the load average
of an idle system is bumped to 2 instead of 0. On systems with PREEMPT=y
this would mean the load average of an idle system is bumped to 3
instead of 0.

This adds proper API using TASK_IDLE to make such goals explicit and
avoid confusion.

Suggested-by: "Eric W. Biederman" <ebiederm@...ssion.com>
Signed-off-by: Luis R. Rodriguez <mcgrof@...nel.org>
---
 include/linux/swait.h | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/include/linux/swait.h b/include/linux/swait.h
index 2c700694d50a..105c70e23286 100644
--- a/include/linux/swait.h
+++ b/include/linux/swait.h
@@ -194,4 +194,29 @@ do {									\
 	__ret;								\
 })

+#define __swait_event_idle(wq, condition)				\
+	___swait_event(wq, condition, TASK_IDLE, 0, schedule())
+
+#define swait_event_idle(wq, condition)					\
+({									\
+	int __ret = 0;							\
+	if (!(condition))						\
+		__ret = __swait_event_idle(wq, condition);		\
+	__ret;								\
+})
+
+#define __swait_event_idle_timeout(wq, condition, timeout)		\
+	___swait_event(wq, ___wait_cond_timeout(condition),		\
+		       TASK_IDLE, timeout,				\
+		       __ret = schedule_timeout(__ret))
+
+#define swait_event_idle_timeout(wq, condition, timeout)		\
+({									\
+	long __ret = timeout;						\
+	if (!___wait_cond_timeout(condition))				\
+		__ret = __swait_event_idle_timeout(wq,			\
+						   condition, timeout);	\
+	__ret;								\
+})
+
 #endif /* _LINUX_SWAIT_H */
-- 
2.11.0