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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2017-11-09 16:21:37 +0100 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2017-11-20 08:36:49 +0100 |
| commit | c597fb166e05d315ce5da29c0a43a09992772dad (patch) | |
| tree | 627d3f248020e0a292fe7dcb2505cf4d90957ae7 /cpukit/score/src/schedulercbsunblock.c | |
| parent | bsps/powerpc: Fix PPC_EXC_CONFIG_USE_FIXED_HANDLER (diff) | |
| download | rtems-c597fb166e05d315ce5da29c0a43a09992772dad.tar.bz2 | |
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:
text filename
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
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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:
text filename
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
Diffstat (limited to 'cpukit/score/src/schedulercbsunblock.c')
| -rw-r--r-- | cpukit/score/src/schedulercbsunblock.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/cpukit/score/src/schedulercbsunblock.c b/cpukit/score/src/schedulercbsunblock.c index 403435eeb1..9b7a0ca424 100644 --- a/cpukit/score/src/schedulercbsunblock.c +++ b/cpukit/score/src/schedulercbsunblock.c @@ -34,12 +34,11 @@ void _Scheduler_CBS_Unblock( Scheduler_CBS_Node *the_node; Scheduler_CBS_Server *serv_info; Priority_Control priority; - bool prepend_it; the_node = _Scheduler_CBS_Node_downcast( node ); serv_info = the_node->cbs_server; - priority = _Scheduler_Node_get_priority( &the_node->Base.Base, &prepend_it ); - (void) prepend_it; + priority = _Scheduler_Node_get_priority( &the_node->Base.Base ); + priority = SCHEDULER_PRIORITY_PURIFY( priority ); /* * Late unblock rule for deadline-driven tasks. The remaining time to |