From: Luca Abeni <[email protected]> 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).
Signed-off-by: Luca Abeni <[email protected]> Tested-by: Daniel Bristot de Oliveira <[email protected]> --- 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 84cd00f..7fcc3bd 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -4207,7 +4207,8 @@ 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; /* diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index f4d36aa..0f545c1 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: -- 2.7.4
