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kernel: Force high priority threads to yield less often

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This commit is contained in:
Pawel Dziepak
2013-10-08 04:53:30 +02:00
parent 547b8c76c7
commit bab69bdb47
1 changed files with 3 additions and 2 deletions
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src/system/kernel/scheduler/scheduler_simple.cpp
+3 -2
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@@ -116,8 +116,9 @@ simple_get_effective_priority(Thread *thread)
int32 effectivePriority = thread->priority; int32 effectivePriority = thread->priority;
if (effectivePriority < B_FIRST_REAL_TIME_PRIORITY) { if (effectivePriority < B_FIRST_REAL_TIME_PRIORITY) {
if (schedulerThreadData->forced_yield_count const int kYieldFrequency = 1 << (min_c(thread->priority, 25) / 5 + 1);
&& schedulerThreadData->forced_yield_count % 16 == 0) { if (schedulerThreadData->forced_yield_count != 0
&& schedulerThreadData->forced_yield_count % kYieldFrequency == 0) {
TRACE("forcing thread %ld to yield\n", thread->id); TRACE("forcing thread %ld to yield\n", thread->id);
effectivePriority = B_LOWEST_ACTIVE_PRIORITY; effectivePriority = B_LOWEST_ACTIVE_PRIORITY;
} else } else