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author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2018-08-10 07:34:03 +0200 |
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committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2018-08-23 14:38:41 +0200 |
commit | ba0e9631a0e0a74a9c3d823d3d1bb60900da4891 (patch) | |
tree | 0d73747ddfd818bbe1a3409253c449c6fedabc8e /cpukit/score/src/threaddispatch.c | |
parent | Add dummy PI_SOFT to <sys/priority.h> (diff) | |
download | rtems-ba0e9631a0e0a74a9c3d823d3d1bb60900da4891.tar.bz2 |
score: Do not inline _Thread_Dispatch_enable()
This function is slighly too complex for inlining with two if
statements. The caller already needs a stack frame due to the potential
call to _Thread_Do_dispatch(). In _Thread_Dispatch_enable() the call to
_Thread_Do_dispatch() can be optimized to a tail call.
A text size comparision
(text size after patch - text size before patch)
/ text size before patch
on sparc/erc32 with SMP enabled showed these results:
Minimum -0.000697892 (fsdosfsname01.exe)
Median -0.00745021 (psxtimes01.exe)
Maximum -0.0233032 (spscheduler01.exe)
A text size comparision
text size after patch - text size before patch
on sparc/erc32 with SMP enabled showed these results:
Minimum -3312 (ada_sp09.exe)
Median -1024 (tm15.exe)
Maximum -592 (spglobalcon01.exe)
Diffstat (limited to 'cpukit/score/src/threaddispatch.c')
-rw-r--r-- | cpukit/score/src/threaddispatch.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/cpukit/score/src/threaddispatch.c b/cpukit/score/src/threaddispatch.c index 9cd1e294ed..d6207bc898 100644 --- a/cpukit/score/src/threaddispatch.c +++ b/cpukit/score/src/threaddispatch.c @@ -267,3 +267,30 @@ void _Thread_Dispatch_direct( Per_CPU_Control *cpu_self ) _ISR_Local_disable( level ); _Thread_Do_dispatch( cpu_self, level ); } + +void _Thread_Dispatch_enable( Per_CPU_Control *cpu_self ) +{ + uint32_t disable_level = cpu_self->thread_dispatch_disable_level; + + if ( disable_level == 1 ) { + ISR_Level level; + + _ISR_Local_disable( level ); + + if ( + cpu_self->dispatch_necessary +#if defined(RTEMS_SCORE_ROBUST_THREAD_DISPATCH) + || !_ISR_Is_enabled( level ) +#endif + ) { + _Thread_Do_dispatch( cpu_self, level ); + } else { + cpu_self->thread_dispatch_disable_level = 0; + _Profiling_Thread_dispatch_enable( cpu_self, 0 ); + _ISR_Local_enable( level ); + } + } else { + _Assert( disable_level > 0 ); + cpu_self->thread_dispatch_disable_level = disable_level - 1; + } +} |