take a look and learn more about the JAVA virtual machine. At this time, the space allocation guarantee strategy will be implemented. His exact words go like this: bring objects that cannot be accommodated by survivor directly into the old age. So it should be full of survivor2.. Then deposit the remaining 1m into the old age.

there are extensions in parentheses, which you can skip (by the way, say a few more words). In minorgc. Jvm will check whether the remaining space in the old age is larger than the size of the surviving objects in this gc. For example, the remaining 1m objects above. In the old days, there was less than a trillion of space. Then check to see if the virtual machine is allowed to take risks (HandlePromotionFailure parameter). With permission. It will also check whether the average size of previous promotions to the old age is less than the maximum continuous available space in the current old age. If less than. Minorgc will be attempted. Otherwise, fullgc will be carried out directly. )

there is also the second case you mentioned. The large object that executes the jvm goes directly into the old policy (provided that the value of the-xx:PretenureSizeThreashold parameter is greater than 5m). If the old age cannot accommodate these two objects. Fullgc will be carried out. If not after fullgc. Then fullgc