https://nalar.dev/tags/memory-mapping/ Recent content in Memory Mapping on Nalar Hugo en-us Wed, 23 Sep 2026 00:00:00 +0000 https://nalar.dev/madv-dontfork-excludes-memory-ranges-from-child-address-spaces/ Wed, 23 Sep 2026 00:00:00 +0000 https://nalar.dev/madv-dontfork-excludes-memory-ranges-from-child-address-spaces/ <p><code>MADV_DONTFORK</code> changes a specific part of Linux process creation: a mapping marked with this advice is not made available in the child created by <code>fork()</code>. The parent keeps the mapping. The child starts without that address range, so an address that was valid there in the parent is not automatically valid in the child.</p> <p>This is a semantic control over mapping inheritance, not a cache hint. It belongs to the Linux-specific <code>madvise()</code> operations whose effects can change memory behavior.</p>