linux-kernel - [RFC 7/8] Make GRUB a task's flag

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Date:	Thu, 14 Jan 2016 16:24:52 +0100
From:	Luca Abeni <luca.abeni@...tn.it>
To:	linux-kernel@...r.kernel.org
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Juri Lelli <juri.lelli@....com>,
	Luca Abeni <luca.abeni@...tn.it>
Subject: [RFC 7/8] Make GRUB a task's flag

---
 include/uapi/linux/sched.h | 1 +
 kernel/sched/core.c        | 2 +-
 kernel/sched/deadline.c    | 4 +++-
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/uapi/linux/sched.h b/include/uapi/linux/sched.h
index cc89dde..9279562 100644
--- a/include/uapi/linux/sched.h
+++ b/include/uapi/linux/sched.h
@@ -48,5 +48,6 @@
  * 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 7ca17e4c..1a384c7 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3911,7 +3911,7 @@ 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 4795d7f..712cc6d 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -864,7 +864,9 @@ static void update_curr_dl(struct rq *rq)
 
 	sched_rt_avg_update(rq, delta_exec);
 
-	delta_exec = grub_reclaim(delta_exec, rq, curr->dl.dl_bw);
+	if (unlikely(dl_se->flags & SCHED_FLAG_RECLAIM)) {
+		delta_exec = grub_reclaim(delta_exec, rq, curr->dl.dl_bw);
+	}
 	dl_se->runtime -= dl_se->dl_yielded ? 0 : delta_exec;
 	trace_sched_stat_params_dl(curr, dl_se->runtime, dl_se->deadline);
 	if (dl_runtime_exceeded(dl_se)) {
-- 
1.9.1