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Expose TC_CallCountThreshold and TC_CallCountingDelayMs as runtime knobs #90724

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Aug 17, 2023
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Expose TC_CallCountThreshold and TC_CallCountingDelayMs as runtime knobs #90724

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5 changes: 3 additions & 2 deletions src/coreclr/inc/clrconfigvalues.h
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Original file line number Diff line number Diff line change
Expand Up @@ -574,9 +574,10 @@ RETAIL_CONFIG_DWORD_INFO(UNSUPPORTED_TC_QuickJitForLoops, W("TC_QuickJitForLoops
RETAIL_CONFIG_DWORD_INFO(UNSUPPORTED_TC_QuickJitForLoops, W("TC_QuickJitForLoops"), 0, "When quick JIT is enabled, quick JIT may also be used for methods that contain loops.")
#endif // defined(TARGET_AMD64) || defined(TARGET_ARM64) || defined(TARGET_LOONGARCH64)
RETAIL_CONFIG_DWORD_INFO(EXTERNAL_TC_AggressiveTiering, W("TC_AggressiveTiering"), 0, "Transition through tiers aggressively.")
RETAIL_CONFIG_DWORD_INFO(EXTERNAL_TC_CallCountThreshold, W("TC_CallCountThreshold"), TC_CallCountThreshold, "Number of times a method must be called in tier 0 after which it is promoted to the next tier.")
RETAIL_CONFIG_DWORD_INFO(EXTERNAL_TC_CallCountingDelayMs, W("TC_CallCountingDelayMs"), TC_CallCountingDelayMs, "A perpetual delay in milliseconds that is applied to call counting in tier 0 and jitting at higher tiers, while there is startup-like activity.")

RETAIL_CONFIG_DWORD_INFO(INTERNAL_TC_BackgroundWorkerTimeoutMs, W("TC_BackgroundWorkerTimeoutMs"), TC_BackgroundWorkerTimeoutMs, "How long in milliseconds the background worker thread may remain idle before exiting.")
RETAIL_CONFIG_DWORD_INFO(INTERNAL_TC_CallCountThreshold, W("TC_CallCountThreshold"), TC_CallCountThreshold, "Number of times a method must be called in tier 0 after which it is promoted to the next tier.")
RETAIL_CONFIG_DWORD_INFO(INTERNAL_TC_CallCountingDelayMs, W("TC_CallCountingDelayMs"), TC_CallCountingDelayMs, "A perpetual delay in milliseconds that is applied to call counting in tier 0 and jitting at higher tiers, while there is startup-like activity.")
RETAIL_CONFIG_DWORD_INFO(INTERNAL_TC_DelaySingleProcMultiplier, W("TC_DelaySingleProcMultiplier"), TC_DelaySingleProcMultiplier, "Multiplier for TC_CallCountingDelayMs that is applied on a single-processor machine or when the process is affinitized to a single processor.")
RETAIL_CONFIG_DWORD_INFO(INTERNAL_TC_CallCounting, W("TC_CallCounting"), 1, "Enabled by default (only activates when TieredCompilation is also enabled). If disabled immediately backpatches prestub, and likely prevents any promotion to higher tiers")
RETAIL_CONFIG_DWORD_INFO(INTERNAL_TC_UseCallCountingStubs, W("TC_UseCallCountingStubs"), 1, "Uses call counting stubs for faster call counting.")
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8 changes: 5 additions & 3 deletions src/coreclr/vm/eeconfig.cpp
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Expand Up @@ -721,7 +721,8 @@ HRESULT EEConfig::sync()
fTieredCompilation_CallCounting = CLRConfig::GetConfigValue(CLRConfig::INTERNAL_TC_CallCounting) != 0;

DWORD tieredCompilation_ConfiguredCallCountThreshold =
CLRConfig::GetConfigValue(CLRConfig::INTERNAL_TC_CallCountThreshold);
Configuration::GetKnobDWORDValue(W("System.Runtime.TC_CallCountThreshold"), CLRConfig::EXTERNAL_TC_CallCountThreshold);

if (tieredCompilation_ConfiguredCallCountThreshold == 0)
{
tieredCompilation_CallCountThreshold = 1;
Expand All @@ -735,8 +736,9 @@ HRESULT EEConfig::sync()
tieredCompilation_CallCountThreshold = (UINT16)tieredCompilation_ConfiguredCallCountThreshold;
}

tieredCompilation_CallCountingDelayMs = CLRConfig::GetConfigValue(CLRConfig::INTERNAL_TC_CallCountingDelayMs);

tieredCompilation_CallCountingDelayMs =
Configuration::GetKnobDWORDValue(W("System.Runtime.TC_CallCountingDelayMs"), CLRConfig::EXTERNAL_TC_CallCountingDelayMs);

bool hasSingleProcessor = GetCurrentProcessCpuCount() == 1;
if (hasSingleProcessor)
{
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