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Previously each malloc size class would keep around a limited number of unused blocks which were marked with MADV_SET_VOLATILE which could then be reinitialized when additional blocks were needed. This changes malloc() so that it also keeps around a number of blocks without marking them with MADV_SET_VOLATILE. I termed these "hot" blocks whereas blocks which were marked as MADV_SET_VOLATILE are called "cold" blocks because they're more expensive to reinitialize. In the worst case this could increase memory usage per process by 1MB when a program requests a bunch of memory and frees all of it. Also, in order to make more efficient use of these unused blocks they're now shared between size classes. |
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