[GR-60343] Add change tracking for AdaptiveCollectionPolicy.

PullRequest: graal/19528

Author: peter-hofer

substratevm/src/com.oracle.svm.core.genscavenge/src/com/oracle/svm/core/genscavenge/AdaptiveCollectionPolicy.java

@@ -31,6 +31,7 @@
 
 import com.oracle.svm.core.Uninterruptible;
 import com.oracle.svm.core.heap.GCCause;
+import com.oracle.svm.core.util.BasedOnJDKFile;
 import com.oracle.svm.core.util.TimeUtils;
 import com.oracle.svm.core.util.UnsignedUtils;
 
@@ -42,6 +43,13 @@
  * its base class {@code AdaptiveSizePolicy}. Method and variable names have been kept mostly the
  * same for comparability.
  */
+@BasedOnJDKFile("https://github.com/openjdk/jdk/blob/jdk-25+1/src/hotspot/share/gc/shared/adaptiveSizePolicy.hpp")
+@BasedOnJDKFile("https://github.com/openjdk/jdk/blob/jdk-25+1/src/hotspot/share/gc/shared/adaptiveSizePolicy.cpp")
+@BasedOnJDKFile("https://github.com/openjdk/jdk/blob/jdk-25+1/src/hotspot/share/gc/parallel/psAdaptiveSizePolicy.hpp")
+@BasedOnJDKFile("https://github.com/openjdk/jdk/blob/jdk-25+1/src/hotspot/share/gc/parallel/psAdaptiveSizePolicy.cpp")
+@BasedOnJDKFile("https://github.com/openjdk/jdk/blob/jdk-25+1/src/hotspot/share/gc/parallel/psParallelCompact.cpp#L951-L1174")
+@BasedOnJDKFile("https://github.com/openjdk/jdk/blob/jdk-25+1/src/hotspot/share/gc/parallel/psScavenge.cpp#L321-L639")
+@BasedOnJDKFile("https://github.com/openjdk/jdk/blob/jdk-25+1/src/hotspot/share/gc/shared/gc_globals.hpp#L308-L420")
 class AdaptiveCollectionPolicy extends AbstractCollectionPolicy {
 
     /*
@@ -152,7 +160,7 @@ public String getName() {
     }
 
     @Override
-    public boolean shouldCollectCompletely(boolean followingIncrementalCollection) { // should_{attempt_scavenge,full_GC}
+    public boolean shouldCollectCompletely(boolean followingIncrementalCollection) { // should_attempt_scavenge
         guaranteeSizeParametersInitialized();
 
         if (!followingIncrementalCollection && shouldCollectYoungGenSeparately(!SerialGCOptions.useCompactingOldGen())) {
@@ -182,17 +190,7 @@ public boolean shouldCollectCompletely(boolean followingIncrementalCollection) {
             return true;
         }
 
-        UnsignedWord youngUsed = HeapImpl.getHeapImpl().getYoungGeneration().getChunkBytes();
-        UnsignedWord oldUsed = HeapImpl.getHeapImpl().getOldGeneration().getChunkBytes();
-
-        /*
-         * If the remaining free space in the old generation is less than what is expected to be
-         * needed by the next collection, do a full collection now.
-         */
-        UnsignedWord averagePromoted = UnsignedUtils.fromDouble(avgPromoted.getPaddedAverage());
-        UnsignedWord promotionEstimate = UnsignedUtils.min(averagePromoted, youngUsed);
-        UnsignedWord oldFree = oldSize.subtract(oldUsed);
-        return promotionEstimate.aboveThan(oldFree);
+        return false;
     }
 
     private void updateAverages(boolean isSurvivorOverflow, UnsignedWord survivedChunkBytes, UnsignedWord promotedChunkBytes) {