linux-kernel - [PATCH 8/8] Documentation/scheduler/sched-deadline.txt: Split Section 3

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Message-Id: <1428661195-9609-9-git-send-email-luca.abeni@unitn.it>
Date:	Fri, 10 Apr 2015 12:19:55 +0200
From:	Luca Abeni <luca.abeni@...tn.it>
To:	peterz@...radead.org
Cc:	henrik@...tad.us, juri.lelli@...il.com, raistlin@...ux.it,
	mingo@...nel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, Luca Abeni <luca.abeni@...tn.it>
Subject: [PATCH 8/8] Documentation/scheduler/sched-deadline.txt: Split Section 3

Introduce 4 subsections to make Section 3 more readable.
---
 Documentation/scheduler/sched-deadline.txt |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Documentation/scheduler/sched-deadline.txt b/Documentation/scheduler/sched-deadline.txt
index e605d7f..ef7ed7d 100644
--- a/Documentation/scheduler/sched-deadline.txt
+++ b/Documentation/scheduler/sched-deadline.txt
@@ -8,6 +8,10 @@ CONTENTS
  1. Overview
  2. Scheduling algorithm
  3. Scheduling Real-Time Tasks
+   3.1 Definitions 
+   3.2 Schedulability Analysis for Uniprocessor Systems
+   3.3 Schedulability Analysis for Multiprocessor Systems
+   3.4 Relationship with SCHED_DEADLINE Parameters
  4. Bandwidth management
    4.1 System-wide settings
    4.2 Task interface
@@ -126,6 +130,9 @@ CONTENTS
  suited for periodic or sporadic real-time tasks that need guarantees on their
  timing behavior, e.g., multimedia, streaming, control applications, etc.
 
+3.1 Definitions 
+------------------------
+
  A typical real-time task is composed of a repetition of computation phases
  (task instances, or jobs) which are activated on a periodic or sporadic
  fashion.
@@ -165,6 +172,9 @@ CONTENTS
  is the minimum WCET, and U_max = max{WCET_i/P_i} is the maximum
  utilisation[12].
 
+3.2 Schedulability Analysis for Uniprocessor Systems
+------------------------
+
  If M=1 (uniprocessor system), or in case of partitioned scheduling (each
  real-time task is statically assigned to one and only one CPU), it is
  possible to formally check if all the deadlines are respected.
@@ -203,6 +213,9 @@ CONTENTS
  time-consuming to be performed on-line. Hence, as explained in Section
  4 Linux uses an admission test based on the tasks' utilisations.
 
+3.3 Schedulability Analysis for Multiprocessor Systems
+------------------------
+
  On multiprocessor systems with global EDF scheduling (non partitioned
  systems), a sufficient test for schedulability can not be based on the
  utilisations or densities: it can be shown that even if D_i = P_i task
@@ -248,6 +261,9 @@ CONTENTS
  the total utilisation is smaller or equal than M then the response times of
  the tasks are limited.
 
+3.4 Relationship with SCHED_DEADLINE Parameters
+------------------------
+
  Finally, it is important to understand the relationship between the
  SCHED_DEADLINE scheduling parameters described in Section 2 (runtime,
  deadline and period) and the real-time task parameters (WCET, D, P)
-- 
1.7.9.5

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