cms gc

Posted on:December 26, 2022 at 05:08 PM

背景

了解java 的cms gc 算法

路径

src\hotspot\share\gc\serial\defNewGeneration.cpp
// Ignores "ref" and calls allocate().
oop Generation::promote(oop obj, size_t obj_size) {
  assert(obj_size == obj->size(), "bad obj_size passed in");

#ifndef PRODUCT
  if (GenCollectedHeap::heap()->promotion_should_fail()) {
    return NULL;
  }
#endif  // #ifndef PRODUCT

  HeapWord* result = allocate(obj_size, false);
  if (result != NULL) {
    Copy::aligned_disjoint_words(cast_from_oop<HeapWord*>(obj), result, obj_size);
    return cast_to_oop(result);
  } else {
    GenCollectedHeap* gch = GenCollectedHeap::heap();
    return gch->handle_failed_promotion(this, obj, obj_size);
  }
}

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