diff options
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/schedulersimpleyield.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
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
text filename
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
text filename
28520 sparc-rtems5/c/gr740/cpukit/score/src/libscore_a-scheduleredfsmp.o
text filename
32664 powerpc-rtems5/c/qoriq_e6500_32/cpukit/score/src/libscore_a-scheduleredfsmp.o
Diffstat (limited to 'cpukit/score/src/schedulersimpleyield.c')
-rw-r--r-- | cpukit/score/src/schedulersimpleyield.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/cpukit/score/src/schedulersimpleyield.c b/cpukit/score/src/schedulersimpleyield.c index 0c150d8b1f..95f9cd3540 100644 --- a/cpukit/score/src/schedulersimpleyield.c +++ b/cpukit/score/src/schedulersimpleyield.c @@ -26,12 +26,16 @@ void _Scheduler_simple_Yield( Scheduler_Node *node ) { - Scheduler_simple_Context *context = - _Scheduler_simple_Get_context( scheduler ); + Scheduler_simple_Context *context; + unsigned int insert_priority; + + context = _Scheduler_simple_Get_context( scheduler ); (void) node; _Chain_Extract_unprotected( &the_thread->Object.Node ); - _Scheduler_simple_Insert_priority_fifo( &context->Ready, the_thread ); + insert_priority = (unsigned int) _Thread_Get_priority( the_thread ); + insert_priority = SCHEDULER_PRIORITY_APPEND( insert_priority ); + _Scheduler_simple_Insert( &context->Ready, the_thread, insert_priority ); _Scheduler_simple_Schedule_body( scheduler, the_thread, false ); } |