255     // Let the size policy know we're done
 256     size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause);
 257 
 258     if (UseAdaptiveSizePolicy) {
 259 
 260       if (PrintAdaptiveSizePolicy) {
 261         gclog_or_tty->print("AdaptiveSizeStart: ");
 262         gclog_or_tty->stamp();
 263         gclog_or_tty->print_cr(" collection: %d ",
 264                        heap->total_collections());
 265         if (Verbose) {
 266           gclog_or_tty->print("old_gen_capacity: " SIZE_FORMAT
 267             " young_gen_capacity: " SIZE_FORMAT,
 268             old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes());
 269         }
 270       }
 271 
 272       // Don't check if the size_policy is ready here.  Let
 273       // the size_policy check that internally.
 274       if (UseAdaptiveGenerationSizePolicyAtMajorCollection &&
 275           ((gc_cause != GCCause::_java_lang_system_gc) ||
 276             UseAdaptiveSizePolicyWithSystemGC)) {
 277         // Swap the survivor spaces if from_space is empty. The
 278         // resize_young_gen() called below is normally used after
 279         // a successful young GC and swapping of survivor spaces;
 280         // otherwise, it will fail to resize the young gen with
 281         // the current implementation.
 282         if (young_gen->from_space()->is_empty()) {
 283           young_gen->from_space()->clear(SpaceDecorator::Mangle);
 284           young_gen->swap_spaces();
 285         }
 286 
 287         // Calculate optimal free space amounts
 288         assert(young_gen->max_size() >
 289           young_gen->from_space()->capacity_in_bytes() +
 290           young_gen->to_space()->capacity_in_bytes(),
 291           "Sizes of space in young gen are out-of-bounds");
 292 
 293         size_t young_live = young_gen->used_in_bytes();
 294         size_t eden_live = young_gen->eden_space()->used_in_bytes();
 295         size_t old_live = old_gen->used_in_bytes();
 296         size_t cur_eden = young_gen->eden_space()->capacity_in_bytes();

 255     // Let the size policy know we're done
 256     size_policy->major_collection_end(old_gen->used_in_bytes(), gc_cause);
 257 
 258     if (UseAdaptiveSizePolicy) {
 259 
 260       if (PrintAdaptiveSizePolicy) {
 261         gclog_or_tty->print("AdaptiveSizeStart: ");
 262         gclog_or_tty->stamp();
 263         gclog_or_tty->print_cr(" collection: %d ",
 264                        heap->total_collections());
 265         if (Verbose) {
 266           gclog_or_tty->print("old_gen_capacity: " SIZE_FORMAT
 267             " young_gen_capacity: " SIZE_FORMAT,
 268             old_gen->capacity_in_bytes(), young_gen->capacity_in_bytes());
 269         }
 270       }
 271 
 272       // Don't check if the size_policy is ready here.  Let
 273       // the size_policy check that internally.
 274       if (UseAdaptiveGenerationSizePolicyAtMajorCollection &&
 275           AdaptiveSizePolicy::should_update_promo_stats(gc_cause)) {

 276         // Swap the survivor spaces if from_space is empty. The
 277         // resize_young_gen() called below is normally used after
 278         // a successful young GC and swapping of survivor spaces;
 279         // otherwise, it will fail to resize the young gen with
 280         // the current implementation.
 281         if (young_gen->from_space()->is_empty()) {
 282           young_gen->from_space()->clear(SpaceDecorator::Mangle);
 283           young_gen->swap_spaces();
 284         }
 285 
 286         // Calculate optimal free space amounts
 287         assert(young_gen->max_size() >
 288           young_gen->from_space()->capacity_in_bytes() +
 289           young_gen->to_space()->capacity_in_bytes(),
 290           "Sizes of space in young gen are out-of-bounds");
 291 
 292         size_t young_live = young_gen->used_in_bytes();
 293         size_t eden_live = young_gen->eden_space()->used_in_bytes();
 294         size_t old_live = old_gen->used_in_bytes();
 295         size_t cur_eden = young_gen->eden_space()->capacity_in_bytes();