https://nalar.dev/tags/io_uring/ Recent content in Io_uring on Nalar Hugo en-us Wed, 16 Sep 2026 00:00:00 +0700 https://nalar.dev/io-uring-registered-files-bypass-repeated-descriptor-lookup/ Wed, 16 Sep 2026 00:00:00 +0700 https://nalar.dev/io-uring-registered-files-bypass-repeated-descriptor-lookup/ <p>An <code>io_uring</code> request that uses a normal file descriptor still has to resolve that descriptor through the submitting task&rsquo;s file table. A registered file takes a different path: the ring holds a reference to the open file, and an SQE names a slot in that ring-local table.</p> <p>That distinction removes repeated descriptor lookup from the request path. It also changes resource lifetime, update semantics, and the meaning of the SQE <code>fd</code> field.</p>