Commit-ID: 2d4283e9d583a3ee8cfb1cbb9c1270614df4c29d Gitweb: http://git.kernel.org/tip/2d4283e9d583a3ee8cfb1cbb9c1270614df4c29d Author: Luca Abeni <[email protected]> AuthorDate: Thu, 18 May 2017 22:13:33 +0200 Committer: Ingo Molnar <[email protected]> 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 <[email protected]> Signed-off-by: Luca Abeni <[email protected]> Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Cc: Claudio Scordino <[email protected]> Cc: Joel Fernandes <[email protected]> Cc: Juri Lelli <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Mathieu Poirier <[email protected]> Cc: Mike Galbraith <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Steven Rostedt <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Tommaso Cucinotta <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[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 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:
