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<!DOCTYPE html>
<html lang="zh-Hans">
<head>
<meta charset="UTF-8">
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var NexT = window.NexT || {};
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</script>
<meta name="description" content="这是一颗烂樱桃的技术博客，一个微不足道的魔都程序员，或者是自以为的程序员">
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<title>Yi颗烂樱桃</title>
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<h2 class="post-title" itemprop="name headline">
<a href="/2024/10/09/dsa-how-to-use/" class="post-title-link" itemprop="url">一张图看明白如何使用Intel DSA</a>
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<span class="post-meta-item-text">Edited on</span>
<time title="Modified: 2024-10-24 15:36:02" itemprop="dateModified" datetime="2024-10-24T15:36:02+08:00">2024-10-24</time>
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<a href="/categories/Kernel/" itemprop="url" rel="index"><span itemprop="name">Kernel</span></a>
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<div class="post-body" itemprop="articleBody">
<h2 id="什么是DSA"><a href="#什么是DSA" class="headerlink" title="什么是DSA"></a>什么是DSA</h2><p>英特尔® DSA（Data Stream Accelerator 数据流加速器）是一款高性能的数据复制和转换加速器，自第四代英特尔® 至强® 处理器开始集成在英特尔® 处理器中。专为优化流数据传输和转换而设计。</p>
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<header class="post-header">
<h2 class="post-title" itemprop="name headline">
<a href="/2024/02/05/markdown2pdf/" class="post-title-link" itemprop="url">Markdown文档转为PDF</a>
</h2>
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<time title="Created: 2024-02-05 14:52:50 / Modified: 18:52:44" itemprop="dateCreated datePublished" datetime="2024-02-05T14:52:50+08:00">2024-02-05</time>
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<h2 id="安装-pandoc-及依赖"><a href="#安装-pandoc-及依赖" class="headerlink" title="安装 pandoc 及依赖"></a>安装 pandoc 及依赖</h2><p>安装pandoc 和 LaTeX 引擎<br>使用 pandoc 转换文档为 pdf，需要安装在操作系统上安装 latex（默认使用 LaTeX 引擎），否则会出现错误 pdflatex not found. Please select a different –pdf-engine or install pdflatex。</p>
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<article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
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<meta itemprop="name" content="Yi颗烂樱桃">
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<h2 class="post-title" itemprop="name headline">
<a href="/2023/08/06/xsave/" class="post-title-link" itemprop="url">xsave 寄存器</a>
</h2>
<div class="post-meta">
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<time title="Created: 2023-08-06 17:39:17" itemprop="dateCreated datePublished" datetime="2023-08-06T17:39:17+08:00">2023-08-06</time>
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<time title="Modified: 2023-08-15 22:30:17" itemprop="dateModified" datetime="2023-08-15T22:30:17+08:00">2023-08-15</time>
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<p>最近研究了下xsaves指令，发现国内中文内容XSAVE(s)相关的太少了。这里简单记一下心得和笔记吧。</p>
<p>总的来说，XSAVE 和 XSAVES 指令的引入是为了支持更复杂的处理器状态，并在多任务环境中实现高效的上下文切换。随着处理器技术的发展，Intel 和 AMD 都引入了许多新的特性和扩展，例如浮点单位、SIMD 扩展（如 MMX、SSE 和 AVX）以及其他功能（如 MPX 和 SGX）。这些扩展和特性增加了处理器的状态大小，意味着传统的上下文保存和恢复机制（如使用 FXSAVE 和 FXRSTOR 指令）不再足够。需要一种高效的方式来保存和恢复处理器状态。<br>XSAVE 允许更灵活地保存和恢复处理器状态。它引入了一个新的数据结构，该结构可以容纳各种处理器状态组件。XSAVE 还支持功能掩码(RFBM/XINUSE)，允许操作系统选择要保存和恢复的状态组件。<br>尽管 XSAVE 增强了上下文切换的能力，但随着处理器状态的进一步增加，还需要进一步的优化。XSAVES 和 XSAVEC 被设计为 XSAVE 的扩展，提供了更紧凑和高效的保存格式。 特别是，XSAVES 提供了对 SGX 和 MPX 的支持，并为未来的处理器特性提供了兼容性。<br>与 XSAVE 和 XSAVES 相伴而来的还有其他相关指令，例如 XRSTOR, XRSTORS, XSAVEOPT 等。</p>
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<p>工作在Linux下的小伙伴可以说对VIM是又爱又恨。今天，用半小时时间让同学们对vim只留下爱，不再有恨。</p>
<h2 id="下载和安装neovim"><a href="#下载和安装neovim" class="headerlink" title="下载和安装neovim"></a>下载和安装neovim</h2>
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<h2 id="步骤对比"><a href="#步骤对比" class="headerlink" title="步骤对比"></a>步骤对比</h2><h3 id="Autotools"><a href="#Autotools" class="headerlink" title="Autotools"></a>Autotools</h3>
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<p>Kprobes 能够动态地中断任何内核正在执行的指令，可以在几乎任何内核代码地址处捕获，指定在断点被命中时要调用的处理函数。<br>目前有两种类型的probe：kprobes 和 kretprobes（也称为return probe）。 kprobe 可以插入到内核中的几乎任何指令上；而kretprobe是当指定函数返回时，会触发返回函数调用。<br>通常，Kprobes会被在内核模块中。在模块的初始化函数中，注册一个或多个probe函数，而在该模块的exit函数中取消注册的函数。后面会贴一些内核的事例代码。</p>
<h2 id="Kprobe"><a href="#Kprobe" class="headerlink" title="Kprobe"></a>Kprobe</h2>
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<p>最近用到了内核中的一些宏定义(Macro)，但一直以来，内核的宏定义学习起来都是比较费劲的，一层套一层的定义，新上手的同学一时间很难搞清楚运行时到底用了哪个宏定义，宏定义展开到底怎样。今天发现一个不错的方法研究内核的宏定义。</p>
<h2 id="使用编译预处理研究宏定义展开"><a href="#使用编译预处理研究宏定义展开" class="headerlink" title="使用编译预处理研究宏定义展开"></a>使用编译预处理研究宏定义展开</h2>
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<h2 id="开启gcov"><a href="#开启gcov" class="headerlink" title="开启gcov"></a>开启gcov</h2><p>看下当前config里面是不是已经enable了gcov：</p>
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<h1 id="什么是-Intel-Processor-Trace"><a href="#什么是-Intel-Processor-Trace" class="headerlink" title="什么是 Intel Processor Trace"></a>什么是 Intel Processor Trace</h1><p>Intel Processor Trace (PT) traces技术以非常小的开销跟踪程序的执行，覆盖所有的分支。 本文简单的介绍下如何利用Perf使用Intel PT跟踪程序执行。<br>更详细的有关Intel PT的介绍请参考 <a target="_blank" rel="noopener" href="https://lwn.net/Articles/648154/">Adding PT to Linux perf</a> 和 <a target="_blank" rel="noopener" href="http://halobates.de/blog/p/406">PT reference page</a>.</p>
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<h2 id="名词解释"><a href="#名词解释" class="headerlink" title="名词解释"></a>名词解释</h2><p>POSIX: Portable Operating System Interface<br>A cross-platform specification supported by UNIX operating systems and those considered UNIX-like, such as Linux. The X in the name originally denoted that the interface was “based on UNIX.”</p>
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