Web Reference: Linux provides a variety of APIs for memory allocation. You can allocate small chunks using kmalloc or kmem_cache_alloc families, large virtually contiguous areas using vmalloc and its derivatives, or you can directly request pages from the page allocator with alloc_pages. The kmalloc() & vmalloc() functions are a simple interface for obtaining kernel memory in byte-sized chunks. The kmalloc() function guarantees that the pages are physically contiguous (and virtually contiguous). Jan 16, 2026 · kmalloc and vmalloc are foundational to Linux kernel memory management, each optimized for distinct use cases. kmalloc excels at small, fast, physically contiguous allocations (e.g., DMA buffers), while vmalloc enables large, virtually contiguous allocations (e.g., kernel modules).
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