linux-kernel - [tip:sched/core] sched/deadline: Make GRUB a task's flag

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Message-ID: <tip-2d4283e9d583a3ee8cfb1cbb9c1270614df4c29d@git.kernel.org>
Date:   Thu, 8 Jun 2017 02:26:22 -0700
From:   tip-bot for Luca Abeni <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     joelaf@...gle.com, tommaso.cucinotta@...up.it,
        claudio@...dence.eu.com, rostedt@...dmis.org,
        torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
        tglx@...utronix.de, efault@....de, juri.lelli@....com,
        luca.abeni@...tannapisa.it, hpa@...or.com, mingo@...nel.org,
        bristot@...hat.com, mathieu.poirier@...aro.org,
        peterz@...radead.org
Subject: [tip:sched/core] sched/deadline: Make GRUB a task's flag

Commit-ID:  2d4283e9d583a3ee8cfb1cbb9c1270614df4c29d
Gitweb:     http://git.kernel.org/tip/2d4283e9d583a3ee8cfb1cbb9c1270614df4c29d
Author:     Luca Abeni <luca.abeni@...tannapisa.it>
AuthorDate: Thu, 18 May 2017 22:13:33 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 8 Jun 2017 10:31:52 +0200

sched/deadline: Make GRUB a task's flag

This patch introduces the SCHED_FLAG_RECLAIM flag to specify
that a DL task is allowed to reclaim unused CPU time (using
the GRUB algorithm).

Tested-by: Daniel Bristot de Oliveira <bristot@...hat.com>
Signed-off-by: Luca Abeni <luca.abeni@...tannapisa.it>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Claudio Scordino <claudio@...dence.eu.com>
Cc: Joel Fernandes <joelaf@...gle.com>
Cc: Juri Lelli <juri.lelli@....com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Mike Galbraith <efault@....de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Tommaso Cucinotta <tommaso.cucinotta@...up.it>
Link: http://lkml.kernel.org/r/1495138417-6203-7-git-send-email-luca.abeni@santannapisa.it
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 include/uapi/linux/sched.h | 1 +
 kernel/sched/core.c        | 3 ++-
 kernel/sched/deadline.c    | 3 ++-
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/uapi/linux/sched.h b/include/uapi/linux/sched.h
index 5f0fe01..e2a6c7b 100644
--- a/include/uapi/linux/sched.h
+++ b/include/uapi/linux/sched.h
@@ -47,5 +47,6 @@
  * For the sched_{set,get}attr() calls
  */
 #define SCHED_FLAG_RESET_ON_FORK	0x01
+#define SCHED_FLAG_RECLAIM		0x02
 
 #endif /* _UAPI_LINUX_SCHED_H */
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 7abd064..8d1a5a6 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4195,7 +4195,8 @@ recheck:
 			return -EINVAL;
 	}
 
-	if (attr->sched_flags & ~(SCHED_FLAG_RESET_ON_FORK))
+	if (attr->sched_flags &
+		~(SCHED_FLAG_RESET_ON_FORK | SCHED_FLAG_RECLAIM))
 		return -EINVAL;
 
 	/*
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 6a0614b..61ea303 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -985,7 +985,8 @@ static void update_curr_dl(struct rq *rq)
 
 	sched_rt_avg_update(rq, delta_exec);
 
-	delta_exec = grub_reclaim(delta_exec, rq);
+	if (unlikely(dl_se->flags & SCHED_FLAG_RECLAIM))
+		delta_exec = grub_reclaim(delta_exec, rq);
 	dl_se->runtime -= delta_exec;
 
 throttle: