Commit-ID: 2d4283e9d583a3ee8cfb1cbb9c1270614df4c29d
Gitweb: http://git.kernel.org/tip/2d4283e9d583a3ee8cfb1cbb9c1270614df4c29d
Author: Luca Abeni <luca.abeni@xxxxxxxxxxxxxxx>
AuthorDate: Thu, 18 May 2017 22:13:33 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Luca Abeni <luca.abeni@xxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Claudio Scordino <claudio@xxxxxxxxxxxxxxx>
Cc: Joel Fernandes <joelaf@xxxxxxxxxx>
Cc: Juri Lelli <juri.lelli@xxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Tommaso Cucinotta <tommaso.cucinotta@xxxxxxxx>
Link: http://lkml.kernel.org/r/1495138417-6203-7-git-send-email-luca.abeni@xxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
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:
--
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