https://blog.troy-y.org/Recent content on Troy's BlogHugoenThu, 23 Apr 2026 18:15:51 +0800https://blog.troy-y.org/posts/linux-mm-0-physical-memory-and-struct-page/Thu, 23 Apr 2026 18:15:51 +0800https://blog.troy-y.org/posts/linux-mm-0-physical-memory-and-struct-page/<h2 id="what-is-physical-memory">What Is Physical Memory?</h2> <p>When we talk about memory management in the Linux kernel, the first question to answer is deceptively simple: what <em>is</em> physical memory, from the kernel&rsquo;s perspective?</p> <p>Your RAM is a flat array of bytes. The kernel doesn&rsquo;t treat it as one giant blob — it slices it into fixed-size chunks called <strong>pages</strong>. On x86_64, the default page size is <strong>4KB</strong>, and a machine with 8GB of RAM has roughly 2 million of them.</p>https://blog.troy-y.org/posts/hello-world/Thu, 23 Apr 2026 00:00:00 +0000https://blog.troy-y.org/posts/hello-world/<p>This is my first Hugo blog post.</p> <p>Migrated from Hexo + Butterfly to Hugo + PaperMod, pursuing simplicity and efficiency.</p>