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<!DOCTYPE html>
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<a href="/2024/12/08/%E6%96%B0%E5%A2%9E-System-Call-%E8%87%B3-Linux-%E6%A0%B8%E5%BF%83/" class="post-title-link" itemprop="url">新增 System Call 至 Linux 核心</a>
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<span class="post-meta-item-text">Word count in article: </span>
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<p>在網路上尋找有關新增 system call 至 Linux 核心的文章時，發現有些文章所提供的方式無法順利執行，可能是核心版本的差異導致作法不同，因此想紀錄下自己嘗試後能夠成功的方法。</p>
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<a href="/2024/11/23/%E5%88%A9%E7%94%A8RDTSC%E9%87%8F%E6%B8%AC%E6%99%82%E8%84%88%E9%80%B1%E6%9C%9F/" class="post-title-link" itemprop="url">利用 RDTSC 量測時脈週期</a>
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<time title="Created: 2024-11-23 16:15:36" itemprop="dateCreated datePublished" datetime="2024-11-23T16:15:36+08:00">2024-11-23</time>
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<span class="post-meta-item-text">Word count in article: </span>
<span>1.3k</span>
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<span class="post-meta-item" title="Reading time">
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<span class="post-meta-item-text">Reading time ≈</span>
<span>5 mins.</span>
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<p>在進行程式的時間測量時，可以透過 <code>rdtsc</code> 指令取得時脈週期。 <code>rdtsc</code> 會返回 CPU 啟動之後所經歷的時脈週期數量，因此我們可以透過該指令在兩個區段相減過後的值來計算一段時間，例如量測執行一段程式碼所花費的時間。</p>
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<span class="post-meta-item-text">Word count in article: </span>
<span>1.7k</span>
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<span class="post-meta-item-text">Reading time ≈</span>
<span>6 mins.</span>
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<p>凌晨 2:00 ，我還在為了下週的考試啃書， Ｌ 小姐雙手仍啪嗒啪嗒地敲著鍵盤。</p>
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<span title="Word count total">5k</span>
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<span title="Reading time total">17 mins.</span>
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