OPPO Kernel Craftsman
Feb 2, 2024 · Fundamentals
Linux Shared Memory (shmem) Deep Dive: Architecture, Implementation, and Practice
Linux’s shmem subsystem provides hybrid anonymous/file‑backed pages that enable diverse shared‑memory scenarios—parent‑child communication, IPC, tmpfs, Android ashmem, and memfd—by using APIs such as shmem_file_setup, handling page faults through cache and swap mechanisms, and employing a specialized reclamation process to manage memory efficiently.
Linux kernelVirtual Memorymemfd
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