*** BLURB HERE *** Hi all, Welcome to Peilin Ye's blog! This is my 2nd blog; my 1st blog is (hopefully) still there, but no longer maintained because: I've decided to keep everything in Markdown; I'd like to focus on writing, instead of moderating spam comments and/or tweaking WordPress themes...

Peilin Ye's blog System76 团队维护一个官方的 Linux 内核仓库（GitHub 链接），基于 Ubuntu 的，但是没有提供 debug（-dbg）包，所以有些内核 debug 工具用不成，比如 drgn：Getting Debugging Symbols — drgn 0.0.23+unknown documentation GitHub 上也有人提了 issue，快一年了也没人理，目前只能自己 build 了。好在流程很简单，我 checkout 了 commit d567a383cdc8 ("Tell thelio-io-2 about suspend status")，执行了 ./rebuild.sh（按它说的装 build 依赖，缺什么装什么就行；我新装的系统，只预先装了个 pahole）和 ./reinstall.sh，然后重启了一下，就换上新内核了： ypl@pop-os:~$ uname -r 6.4.6-76060406-generic ./rebuild.sh 花了半个多小时，唉……不过终于可以用 drgn 了！试试，在 ./debian/build/build-generic/ 里执行 sudo drgn --no-default-symbols -s ./vmlinux：

Peilin Ye's blog 平时 make 加个 -j$(nproc) 已经成习惯了，今天来看看 nproc 是怎么在（我这台）Linux x86_64 机器上工作的。nproc 是 Coreutils（GNU Core Utilities）的一部分，我用的 Debian 10 上的 8.30-3： $ dpkg -S $(which nproc) coreutils: /usr/bin/nproc $ apt-cache show coreutils | grep -i version Version: 8.30-3 $ nproc --version | head -1 nproc (GNU coreutils) 8.30

Peilin Ye's blog Linux: 5.18-rc5, commit 1728c0567f70 ("net: phy: smsc: add LAN8742 phy support.") ypl@home:~$ cat /proc/$$/stat | cut -d' ' -f2 (bash) ypl@home:~$ cat /proc/self/stat | cut -d' ' -f2 (cat) ypl@home:~$ cut -d' ' -f2 < /proc/self/stat (cut)

Peilin Ye's blog arch: x86_64 Bash: 5.1, commit 9439ce094c9a ("Bash-5.1 patch 16: fix interpretation of multiple instances of ! in [[ conditional commands") Linux: 5.18-rc5, commit 9c095bd0d4c4 ("Merge branch 'hns3-next'") QEMU: 7.0.50, commit 2d20a57453f6 ("Merge tag 'pull-fixes-for-7.1-200422-1' of https://github.com/stsquad/qemu into staging") ypl@home:~$ sudo make isntall make: *** No rule to make target 'isntall'. Stop. ypl@home:~$ sudo make isntal^C