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### 7.4.3.2 Parallel Fastpath for Resource Allocation

The commonly used solution uses parallel fastpath with each CPU owning a modest cache of blocks, and with a large code-locked shared pool for additional blocks. To prevent any given CPU from monopolizing the memory blocks, we place a limit on the number of blocks that can be in each CPU's cache. In a two-CPU system, the flow of memory blocks will be as shown in Figure : when a given CPU is trying to free a block when its pool is full, it sends blocks to the global pool, and, similarly, when that CPU is trying to allocate a block when its pool is empty, it retrieves blocks from the global pool.

Figure: Allocator Cache Schematic