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() function guarantees that the pages are physically contiguous (and virtually contiguous). The vmalloc() function works in a similar fashion to kmalloc(), except it allocates memory that is only virtually contiguous and not necessarily physically contiguous. Jan 16, 2026 · Two critical functions in Linux kernel memory allocation are kmalloc and vmalloc. At first glance, both allocate memory, but their behavior, use cases, and underlying mechanisms differ dramatically.
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