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魅族内核团队
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<div class="post-preview">
<a href="/2025/01/06/硬核内核技术：irq_work通用硬中断回调机制首版特性分析/">
<h2 class="post-title">
硬核内核技术：irq_work通用硬中断回调机制首版特性分析
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
irq_work 在实际工程应用的例子是，在手机出现卡屏卡死状态时，可以使用组合按键触发 irq_work 来 dump 系统信息，而避免使用进程调度，因为此时系统可能资源匮乏、锁竞争让执行 dump 系统信息的进程处于 D 状态无法正常调度工作，导致操作失效，失去分析现场的机会。
本文是对 Linux 邮件列表中 ”[PATCH -tip -v6] irq_work: generic ......
</div>
</a>
<p class="post-meta" style="margin: 10px 0;">
Posted by Bo.Chen on
2025-01-06
</p>
<div class="tags">
</div>
</div>
<hr>
<div class="post-preview">
<a href="/2024/12/25/物格而后知至-WALT调度器之RTG/">
<h2 class="post-title">
物格而后知至：WALT调度器之RTG
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
1. 引言
我们在《浅析高通 mvp 进程优先调度》一文中有提到 RTG 任务是 mvp 进程优先调度的其中一种任务类型，然而 RTG 的的影响范围不仅仅是进程优先调度。下面再带大家物格而后知至：再研读高通 WALT 调度器中的RTG。
RTG（Related Thread Group）是高通引入的一个特性，目的是将关联的进程加入到同一个group组中，用于提升性能。比如显示相关的主线程和r......
</div>
</a>
<p class="post-meta" style="margin: 10px 0;">
Posted by Bo.Chen on
2024-12-25
</p>
<div class="tags">
</div>
</div>
<hr>
<div class="post-preview">
<a href="/2024/12/06/Submit-patch-implementations-to-the-Linux-kernel-community/">
<h2 class="post-title">
向 Linux 内核社区提交 patch 实操要点
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
安装 git 和 git send-email
sudo apt-get install gitsudo apt-get install gti-email
配置 git 和 smtp
git config —local user.name “nameVal”git config —local user.email “[email protected]”
vi .git/config// 在文件......
</div>
</a>
<p class="post-meta" style="margin: 10px 0;">
Posted by Lotte on
2024-12-06
</p>
<div class="tags">
</div>
</div>
<hr>
<div class="post-preview">
<a href="/2024/12/06/Isolated-count-mismatch-analysis/">
<h2 class="post-title">
一次山重水复疑无路的卡死问题根源分析
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
Description一个项目中偶现几十上百个 D 进程卡住在 shrink_inactive_list，导致卡顿/卡死/android SWT 等问题，前前后后，提交了 3 次修复，还没有彻底解决。
山重水复疑无路LOG：1234567891011121314151617181920212223242526272829303132333435363738394041424344[14945......
</div>
</a>
<p class="post-meta" style="margin: 10px 0;">
Posted by Lotte on
2024-12-06
</p>
<div class="tags">
</div>
</div>
<hr>
<div class="post-preview">
<a href="/2024/07/12/sub-system-cgroup-freezer-in-Linux-kernel/">
<h2 class="post-title">
进程冻结技术：深入探究 Linux 内核中的 cgroup freezer 子系统
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
kernel version：5.15.119cpu architecture：ARM64cgroup version：cgroup v2
一、背景介绍cgroup 最初由 Google 工程师 Paul Menage 和 Rohit Seth 在 2006 年提出，是一种细粒度资源控制的Linux内核机制。于 2007 年合并到 Linux 内核主线中。然而 Google 原生系统直到......
</div>
</a>
<p class="post-meta" style="margin: 10px 0;">
Posted by BA.Fu on
2024-07-12
</p>
<div class="tags">
<a href="/tags/#freeze_processes" title="freeze_processes">freeze_processes</a>
</div>
</div>
<hr>
<div class="post-preview">
<a href="/2024/05/27/Linux-Page-Table-Check/">
<h2 class="post-title">
内核内存稳定性新特性：Page Table Check 机制解读
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
Linux内核中内存损坏一直是极难定位但又较为常见的一类问题。在内核中已经有较多的机制来拦截此类问题。比如Kasan/Kfence等等。而内核自5.17版本起又引入了Page Table Check机制，用来检测某些page计数异常导致的内存损坏问题。
一、 为何引入Page Table Check机制：Google 的工程师在分析一个进程的dump时，无意间发现了一页不属于该进程的内存。进......
</div>
</a>
<p class="post-meta" style="margin: 10px 0;">
Posted by Jian.Zhou on
2024-05-27
</p>
<div class="tags">
<a href="/tags/#Linux" title="Linux">Linux</a>
</div>
</div>
<hr>
<div class="post-preview">
<a href="/2024/05/16/TouchScreen-Basics/">
<h2 class="post-title">
指尖上的科技：智能手机触摸屏技术与功耗优化
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
1. 概述触摸屏作为现代交互设备中重要的输入方式之一，已广泛应用于手机、平板电脑、电脑显示器等设备中。本文档将从基础知识出发，介绍触摸屏的工作原理，包括传感器感知、信号转换、数据处理和触摸事件传递等关键步骤。接着，将介绍触摸屏的分类，包括电容式触摸屏、电阻式触摸屏等不同技术的特点和应用场景。随后，将探讨触摸屏的工作模式：Actvie/Idle/Sleep Mode，也包括单点触控、多点触控、......
</div>
</a>
<p class="post-meta" style="margin: 10px 0;">
Posted by Tao.wang on
2024-05-16
</p>
<div class="tags">
<a href="/tags/#Thermal" title="Thermal">Thermal</a>
</div>
</div>
<hr>
<div class="post-preview">
<a href="/2024/03/15/Futex机制的内核优化/">
<h2 class="post-title">
性能打磨手记：记一段 Futex 机制的内核优化之旅
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
1. futex简介Futex 是Fast Userspace muTexes的缩写，由 Linux 2.5.7开始引入。传统的SYSTEM V IPC机制需要系统调用进入内核态去操作某个内核对象，由内核来仲裁同步，事实上大部分情况下并没有资源竞争，此种情况下仍然进入内核态会显得很浪费，系统开销增加进而造成性能折扣，由此引入futex的概念。
futex是一种用户态和内核态混合机制，需要两个......
</div>
</a>
<p class="post-meta" style="margin: 10px 0;">
Posted by Haibo.Chen on
2024-03-15
</p>
<div class="tags">
<a href="/tags/#Performance" title="Performance">Performance</a>
</div>
</div>
<hr>
<div class="post-preview">
<a href="/2024/01/12/Qcom-Thermal-Engine-frame-analysis/">
<h2 class="post-title">
手机温控中枢：高通 Thermal Engine 框架分析
</h2>
<h3 class="post-subtitle">
</h3>
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1. 前言在当前移动处理芯片性能过剩的时代，用户对手机的温度要求越来越高，更加苛刻的标准，最好永不发热。在这种背景下，温控领域的工作变得日益重要，众多大厂都在不断魔改和优化他们的温控技术。今天我们也带大家看看温控技术的其中一部分：Thermal Engine。下面，我们将基于 GitHub 上的源代码，对 Thermal Engine 的工作原理进行深入剖析。
Thermal Engine是......
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Posted by Bo.Chen on
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从硬件到软件，Linux 时间子系统全栈解析
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Linux 时间子系统为构建分时多任务操作系统提供了基础设施，使得系统能够准确地管理和处理与时间相关的任务，为任务调度、资源管理、驱动开发和应用程序开发等等都提供了强大的支撑。魅族博客之前也介绍过时间相关的文章：《Linux Time》、《Linux Tick 和 Tickless》、《CPUIDLE 之低功耗定时器》，温故而知新，我们再来一篇从入门到放弃。
1. 整体软件架构linux时间......
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Posted by Haibo.Chen on
2023-12-13
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