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sched/deadline: Make GRUB a task's flag

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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@redhat.com>
Signed-off-by: Luca Abeni <luca.abeni@santannapisa.it>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Claudio Scordino <claudio@evidence.eu.com>
Cc: Joel Fernandes <joelaf@google.com>
Cc: Juri Lelli <juri.lelli@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tommaso Cucinotta <tommaso.cucinotta@sssup.it>
Link: http://lkml.kernel.org/r/1495138417-6203-7-git-send-email-luca.abeni@santannapisa.it
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Luca Abeni 2017-05-18 22:13:33 +02:00 committed by Ingo Molnar
parent 4da3abcefe
commit 2d4283e9d5
3 changed files with 5 additions and 2 deletions
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1
include/uapi/linux/sched.h
View File

@ -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 */

3
kernel/sched/core.c
View File

@ -4195,7 +4195,8 @@ static int __sched_setscheduler(struct task_struct *p,
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;
/*

3
kernel/sched/deadline.c
View File

@ -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: