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Add option GCTrimYoungestKeepPercent to specifies the percent of youngest gen to keep during trimming #109863

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Add option GCTrimYoungestKeepPercent to specifies the percent of youngest gen to keep during trimming #109863

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7 changes: 6 additions & 1 deletion src/coreclr/gc/gc.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -44545,10 +44545,15 @@ void gc_heap::trim_youngest_desired_low_memory()
{
if (g_low_memory_status)
{
int keep_percent = static_cast<int>(GCConfig::GetGCTrimYoungestKeepPercent());
if ((keep_percent <= 0) || (keep_percent > 100))
{
keep_percent = 10;
}
size_t committed_mem = committed_size();
dynamic_data* dd = dynamic_data_of (0);
size_t current = dd_desired_allocation (dd);
size_t candidate = max (Align ((committed_mem / 10), get_alignment_constant(FALSE)), dd_min_size (dd));
size_t candidate = max (Align ((size_t)((committed_mem / 100.0) * keep_percent), get_alignment_constant(FALSE)), dd_min_size (dd));

dd_desired_allocation (dd) = min (current, candidate);
}
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1 change: 1 addition & 0 deletions src/coreclr/gc/gcconfig.h
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Expand Up @@ -96,6 +96,7 @@ class GCConfigStringHolder
STRING_CONFIG(GCHeapAffinitizeRanges, "GCHeapAffinitizeRanges", "System.GC.HeapAffinitizeRanges", "Specifies list of processors for Server GC threads. The format is a comma separated " \
"list of processor numbers or ranges of processor numbers. On Windows, each entry is " \
"prefixed by the CPU group number. Example: Unix - 1,3,5,7-9,12, Windows - 0:1,1:7-9") \
INT_CONFIG (GCTrimYoungestKeepPercent, "GCTrimYoungestKeepPercent", NULL, 10, "Specifies the percent youngest gen to keep during trimming") \
INT_CONFIG (GCHighMemPercent, "GCHighMemPercent", "System.GC.HighMemoryPercent", 0, "The percent for GC to consider as high memory") \
INT_CONFIG (GCProvModeStress, "GCProvModeStress", NULL, 0, "Stress the provisional modes") \
INT_CONFIG (GCGen0MaxBudget, "GCGen0MaxBudget", NULL, 0, "Specifies the largest gen0 allocation budget") \
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