asm-offset.h 文件 asm-offset.h 文件是在内核编译过程中生成的，生成过程 之前整理了一份笔记 TASK_threadsp的实现及asm-offsets.h， 其中涉及sed处理包含在内核代码 /scripts/Makefile.lib的sed-offsets中，工作是将生成的asm-offset.s转化为asm-offset.h。 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 /scripts/Makefile.lib ... # ASM offsets # --------------------------------------------------------------------------- # Default sed regexp - multiline due to syntax constraints # # Use [:space:] because LLVM's integrated assembler inserts <tab> around # the .ascii directive whereas GCC keeps the <space> as-is. define sed-offsets 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \ /^->/{s:->#\(.*\):/* \1 */:; \ s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ s:->::; p;}' endef ...

题目： Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operators are +, -, *, /. Each operand may be an integer or another expression. Note: Division between two integers should truncate toward zero. The given RPN expression is always valid. That means the expression would always evaluate to a result and there won’t be any divide by zero operation. Example 1: Input: 1 ["2", "1", "+", "3", "*"] Output: ...

Linux 内核的Timer必须要完成两种定时测量（timing measurement）

问题： 本周在配合系统测试过程中，发现系统报文接收异常， 排查过程中发现应用进程启动异常。 当时状态模拟如下： 1 2 3 4 5 6 7 8 9 10 11 12 13 [root@centosgpt server]# ps -ef|grep daemon dbus 934 1 0 Jul22 ? 00:01:15 /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation root 941 1 0 Jul22 ? 00:00:15 /usr/sbin/NetworkManager --no-daemon root 81345 1 0 09:27 ? 00:00:00 daemon root 81348 1 0 09:27 ? 00:00:00 daemon root 81351 1 0 09:27 ? 00:00:00 daemon root 81354 1 0 09:27 ? 00:00:00 daemon root 81357 1 0 09:28 ? 00:00:00 daemon root 81360 1 0 09:28 ? 00:00:00 daemon status root 81364 1 0 09:28 ? 00:00:00 daemon start root 81367 1 0 09:28 ? 00:00:00 daemon status root 81370 1 0 09:28 ? 00:00:00 daemon root 81372 80347 0 09:28 pts/2 00:00:00 grep --color=auto daemon daemon status， daemon start 都属于异常进程。 ...

这篇文章 Measuring Transactional Integrity in Airbnb’s Distributed Payment Ecosystem

Daily Temperatures

 这篇文章Re-Architecting the Video Gatekeeper 是出自 Netflix Technology Blog。 Netflix上的视频需要通过Title Operations 团队的策划，使其遵守的合同；字幕、配音、翻译能够提供给合适的人群；标题名称和概要可供使用和翻译；满足各个国家的成熟度等级（分级）。 ...

主动调度与上下文切换

CentOS Linux release 7.5.1804 CoreLinux centosgpt 5.2.0-rc4 1 SMP Sun Jun 16 13:25:49 CST 2019 x86_64 x86_64 x86_64 GNU/Linux

Given a string containing just the characters ‘’, ‘’, ‘{’, ‘}’, ’’ and ‘’, determine if the input string is valid