1 =========================== 2 Boot time memory management 3 =========================== 4 5 Early system initialization cannot use "normal" memory management 6 simply because it is not set up yet. But there is still need to 7 allocate memory for various data structures, for instance for the 8 physical page allocator. 9 10 A specialized allocator called ``memblock`` performs the 11 boot time memory management. The architecture specific initialization 12 must set it up in :c:func:`setup_arch` and tear it down in 13 :c:func:`mem_init` functions. 14 15 Once the early memory management is available it offers a variety of 16 functions and macros for memory allocations. The allocation request 17 may be directed to the first (and probably the only) node or to a 18 particular node in a NUMA system. There are API variants that panic 19 when an allocation fails and those that don't. 20 21 Memblock also offers a variety of APIs that control its own behaviour. 22 23 Memblock Overview 24 ================= 25 26 .. kernel-doc:: mm/memblock.c 27 :doc: memblock overview 28 29 30 Functions and structures 31 ======================== 32 33 Here is the description of memblock data structures, functions and 34 macros. Some of them are actually internal, but since they are 35 documented it would be silly to omit them. Besides, reading the 36 descriptions for the internal functions can help to understand what 37 really happens under the hood. 38 39 .. kernel-doc:: include/linux/memblock.h 40 .. kernel-doc:: mm/memblock.c 41 :functions:
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