source: rtems/cpukit/score/src/schedulerdefaultmappriority.c @ fce900b5

5
Last change on this file since fce900b5 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

text filename

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

text filename

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: 657 bytes
Line 
1/*
2 * Copyright (c) 2016, 2017 embedded brains GmbH
3 *
4 * The license and distribution terms for this file may be
5 * found in the file LICENSE in this distribution or at
6 * http://www.rtems.org/license/LICENSE.
7 */
8
9#if HAVE_CONFIG_H
10#include "config.h"
11#endif
12
13#include <rtems/score/schedulerimpl.h>
14
15Priority_Control _Scheduler_default_Map_priority(
16  const Scheduler_Control *scheduler,
17  Priority_Control         priority
18)
19{
20  return SCHEDULER_PRIORITY_MAP( priority );
21}
22
23Priority_Control _Scheduler_default_Unmap_priority(
24  const Scheduler_Control *scheduler,
25  Priority_Control         priority
26)
27{
28  return SCHEDULER_PRIORITY_UNMAP( priority );
29}
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