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8012371: Adjust Tiered compile threshold according to available space in code cache

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Added command line parameter to define a threshold at which C1 compilation threshold for  is increased.

Reviewed-by: kvn, iveresov
This commit is contained in:
Albert Noll 2013-05-16 15:46:49 +02:00
parent dbe27b6d39
commit 114b578228
6 changed files with 39 additions and 1 deletions
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13
hotspot/src/share/vm/runtime/advancedThresholdPolicy.cpp
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@ -68,7 +68,7 @@ void AdvancedThresholdPolicy::initialize() {
}
#endif
set_increase_threshold_at_ratio();
set_start_time(os::javaTimeMillis());
}
@ -205,6 +205,17 @@ double AdvancedThresholdPolicy::threshold_scale(CompLevel level, int feedback_k)
double queue_size = CompileBroker::queue_size(level);
int comp_count = compiler_count(level);
double k = queue_size / (feedback_k * comp_count) + 1;
// Increase C1 compile threshold when the code cache is filled more
// than specified by IncreaseFirstTierCompileThresholdAt percentage.
// The main intention is to keep enough free space for C2 compiled code
// to achieve peak performance if the code cache is under stress.
if ((TieredStopAtLevel == CompLevel_full_optimization) && (level != CompLevel_full_optimization)) {
double current_reverse_free_ratio = CodeCache::reverse_free_ratio();
if (current_reverse_free_ratio > _increase_threshold_at_ratio) {
k *= exp(current_reverse_free_ratio - _increase_threshold_at_ratio);
}
}
return k;
}