linux-kernel - [PATCH] sched/deadline: comment update for constrained deadline tasks explanation

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Date:   Fri, 24 Nov 2017 11:12:21 +0000
From:   Alessio Balsini <alessio.balsini@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Luca Abeni <luca.abeni@...tannapisa.it>,
        Tommaso Cucinotta <tommaso.cucinotta@...tannapisa.it>
Subject: [PATCH] sched/deadline: comment update for constrained deadline tasks explanation

Remove the adjective "relative" associated to the period of a periodic
task, since the period is an absolute value.

Rephrased the comment with the aim of making it even more clear.

Signed-off-by: Alessio Balsini <alessio.balsini@....com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Juri Lelli <juri.lelli@...hat.com>
Cc: Daniel Bristot de Oliveira <bristot@...hat.com>
Cc: Luca Abeni <luca.abeni@...tannapisa.it>
Cc: Tommaso Cucinotta <tommaso.cucinotta@...tannapisa.it>
Cc: linux-kernel@...r.kernel.org
---
 kernel/sched/deadline.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index f349f7e..902b2e0 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -770,9 +770,9 @@ update_dl_revised_wakeup(struct sched_dl_entity *dl_se, struct rq *rq)
 }
 
 /*
- * Regarding the deadline, a task with implicit deadline has a relative
- * deadline == relative period. A task with constrained deadline has a
- * relative deadline <= relative period.
+ * Regarding periodic real-time tasks, a constrained deadline task has the
+ * relative deadline <= period. An implicit deadline task is a particular case
+ * for which the relative deadline == period.
  *
  * We support constrained deadline tasks. However, there are some restrictions
  * applied only for tasks which do not have an implicit deadline. See
-- 
2.7.4