source: rtems/cpukit/score/src/scheduleredfunblock.c @ 21275b58

5
Last change on this file since 21275b58 was c597fb1, checked in by Sebastian Huber <sebastian.huber@…>, on 11/09/17 at 15:21:37

score: Optimize scheduler priority updates

Thread priority changes may append or prepend the thread to its priority
group on the scheduler ready queue. Previously, a separate priority
value and a prepend-it flag in the scheduler node were used to propagate
a priority change to the scheduler.

Now, use an append-it bit in the priority control and reduce the plain
priority value to 63 bits.

This change leads to a significant code size reduction (about 25%) of
the SMP schedulers. The negligible increase of the standard priority
scheduler is due to some additional shift operations
(SCHEDULER_PRIORITY_MAP() and SCHEDULER_PRIORITY_UNMAP()).

Before:

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136 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulersimpleblock.o
464 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulersimplechangepriority.o

24 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulersimple.o

108 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulersimpleschedule.o
292 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulersimpleunblock.o
264 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulersimpleyield.o

text filename

280 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulerpriorityblock.o
488 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulerprioritychangepriority.o
200 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulerpriority.o
164 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulerpriorityschedule.o
328 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulerpriorityunblock.o
200 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulerpriorityyield.o

text filename

24112 arm-rtems5/c/imx7/cpukit/score/src/libscore_a-scheduleredfsmp.o

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37204 sparc-rtems5/c/gr740/cpukit/score/src/libscore_a-scheduleredfsmp.o

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42236 powerpc-rtems5/c/qoriq_e6500_32/cpukit/score/src/libscore_a-scheduleredfsmp.o

After:

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136 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulersimpleblock.o
272 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulersimplechangepriority.o

24 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulersimple.o

108 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulersimpleschedule.o
292 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulersimpleunblock.o
264 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulersimpleyield.o

text filename

280 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulerpriorityblock.o
488 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulerprioritychangepriority.o
208 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulerpriority.o
164 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulerpriorityschedule.o
332 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulerpriorityunblock.o
200 sparc-rtems5/c/erc32/cpukit/score/src/libscore_a-schedulerpriorityyield.o

text filename

18860 arm-rtems5/c/imx7/cpukit/score/src/libscore_a-scheduleredfsmp.o

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28520 sparc-rtems5/c/gr740/cpukit/score/src/libscore_a-scheduleredfsmp.o

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32664 powerpc-rtems5/c/qoriq_e6500_32/cpukit/score/src/libscore_a-scheduleredfsmp.o

  • Property mode set to 100644
File size: 1.8 KB
Line 
1/**
2 * @file
3 *
4 * @brief Scheduler EDF Unblock
5 * @ingroup ScoreScheduler
6 */
7
8/*
9 *  Copyright (C) 2011 Petr Benes.
10 *  Copyright (C) 2011 On-Line Applications Research Corporation (OAR).
11 *
12 *  The license and distribution terms for this file may be
13 *  found in the file LICENSE in this distribution or at
14 *  http://www.rtems.org/license/LICENSE.
15 */
16
17#if HAVE_CONFIG_H
18#include "config.h"
19#endif
20
21#include <rtems/score/scheduleredfimpl.h>
22#include <rtems/score/schedulerimpl.h>
23#include <rtems/score/thread.h>
24
25void _Scheduler_EDF_Unblock(
26  const Scheduler_Control *scheduler,
27  Thread_Control          *the_thread,
28  Scheduler_Node          *node
29)
30{
31  Scheduler_EDF_Context *context;
32  Scheduler_EDF_Node    *the_node;
33  Priority_Control       priority;
34  Priority_Control       insert_priority;
35
36  context = _Scheduler_EDF_Get_context( scheduler );
37  the_node = _Scheduler_EDF_Node_downcast( node );
38  priority = _Scheduler_Node_get_priority( &the_node->Base );
39  priority = SCHEDULER_PRIORITY_PURIFY( priority );
40  insert_priority = SCHEDULER_PRIORITY_APPEND( priority );
41
42  the_node->priority = priority;
43  _Scheduler_EDF_Enqueue( context, the_node, insert_priority );
44
45  /*
46   *  If the thread that was unblocked is more important than the heir,
47   *  then we have a new heir.  This may or may not result in a
48   *  context switch.
49   *
50   *  Normal case:
51   *    If the current thread is preemptible, then we need to do
52   *    a context switch.
53   *  Pseudo-ISR case:
54   *    Even if the thread isn't preemptible, if the new heir is
55   *    a pseudo-ISR system task, we need to do a context switch.
56   */
57  if ( priority < _Thread_Get_priority( _Thread_Heir ) ) {
58    _Scheduler_Update_heir(
59      the_thread,
60      priority == ( SCHEDULER_EDF_PRIO_MSB | PRIORITY_PSEUDO_ISR )
61    );
62  }
63}
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