按理说应该是1024+512=1536才对，现在是2097152/1024(2048)
是我理解错了？
👍，我当时记错了，刚看了下代码，是还要512*一个page_size，也就是4096
enum SomePublicConstants { card_shift = 9, card_size = 1 << card_shift, card_size_in_words = card_size / sizeof(HeapWord) }; uintx CardTableModRefBS::ct_max_alignment_constraint() { return card_size * os::vm_page_size(); } 复制
enum SomePublicConstants { card_shift = 9, card_size = 1 << card_shift, card_size_in_words = card_size / sizeof(HeapWord) }; uintx CardTableModRefBS::ct_max_alignment_constraint() { return card_size * os::vm_page_size(); }
会按照ct_max_alignment_constraint的返回值对齐，其中card_size是512，os::vm_page_size()是4096，也就是2M对齐
多谢大神指点，那就是可以理解为2M的最小公倍数
👍，我当时记错了，刚看了下代码，是还要512*一个page_size，也就是4096
enum SomePublicConstants { card_shift = 9, card_size = 1 << card_shift, card_size_in_words = card_size / sizeof(HeapWord) }; uintx CardTableModRefBS::ct_max_alignment_constraint() { return card_size * os::vm_page_size(); }会按照ct_max_alignment_constraint的返回值对齐，其中card_size是512，os::vm_page_size()是4096，也就是2M对齐