记录一些 Linux kernel 中好玩的东西
内核的娱乐性
- 基本重复的问题
- 相同的问题可以多层的思考，你以为你解决了，但是实际上你只是中了宇智波鼬的月读
- 千变万化的问题
- 内核中有很多时候的茅塞顿开的时候，忽然间，发现长期困扰的问题，是可以解决的
谈谈 kernel 的模板元编程
include/linux/interval_tree_generic.h
arch/x86/kvm/mmu/paging_tmpl.h
打开一个 shell 到底会调用多少次系统调用
+ sudo bpftrace -e 'kprobe:dput { @[curtask->comm] = count() }'
Attaching 1 probe...
^C
@[systemd-journal]: 1
@[irqbalance]: 4
@[ovsdb-server]: 4
@[rm]: 8
@[tty]: 12
@[dbus-daemon]: 12
@[uname]: 13
@[dirname]: 13
@[locale]: 14
@[clear]: 14
@[wc]: 15
@[date]: 15
@[uuidgen]: 15
@[getconf]: 16
@[in:imjournal]: 16
@[zoxide]: 19
@[users]: 20
@[tput]: 22
@[dircolors]: 22
@[diff]: 23
@[sort]: 24
@[bc]: 26
@[df]: 30
@[python]: 31
@[ls]: 33
@[mktemp]: 36
@[nvim]: 38
@[sed]: 38
@[ip]: 42
@[whoami]: 49
@[id]: 61
@[tmux: server]: 69
@[hostnamectl]: 81
@[ovs-vswitchd]: 87
@[mkdir]: 124
@[/nix/store/b1wv]: 130
@[sqlx-sqlite-wor]: 135
@[cat]: 142
@[grepconf.sh]: 156
@[atuin]: 225
@[grep]: 262
@[awk]: 352
@[direnv]: 402
@[bash]: 651
@[starship]: 682
@[nix]: 1052
@[zsh]: 11012
@[git]: 207446
Tracing syscalls, printing top 10... Ctrl+C to quit.
^C[17:33:32]
SYSCALL COUNT
rt_sigprocmask 36256 // 任何仓库下打开都有
newfstatat 19031 // 在 vn 这个仓库下打开就有
pread64 8529
ppoll 8296
sched_yield 7255
read 5178
rt_sigaction 5124
close 4537
openat 4449
getdents64 3589
只能说现在的机器是真的快啊
把 nvim 打开关闭之后
🧀 sudo bpftrace -e 'kprobe:do_pipe2 { @[curtask->comm] = count() }'
Attaching 1 probe...
^C
@[starship]: 2
@[marksman]: 8
@[.NET TP Worker]: 10
@[zsh]: 13
@[nvim]: 32
想不到系统中连 .NET 都有，实在是过分了
仅仅是打开一个新的 zsh (ctrl h + % )
调用 8万次 walk_component
+ sudo bpftrace -e 'kprobe:walk_component { @[curtask->comm] = count() } interval:s:1000 { exit(); }'
Attaching 2 probes...
^C
@[irqbalance]: 2
@[gmain]: 3
@[in:imjournal]: 4
@[dirname]: 8
@[tty]: 8
@[uname]: 8
@[locale]: 8
@[systemd-udevd]: 12
@[dircolors]: 12
@[date]: 14
@[dbus-daemon]: 21
@[rm]: 21
@[getconf]: 24
@[ls]: 26
@[clear]: 27
@[tput]: 27
@[sed]: 28
@[ip]: 36
@[diff]: 42
@[df]: 45
@[users]: 46
@[tmux: server]: 49
@[id]: 54
@[gix::status::in]: 55
@[gix_status::ind]: 63
@[zoxide]: 69
@[mkdir]: 69
@[whoami]: 71
@[(udev-worker)]: 72
@[cat]: 74
@[wc]: 74
@[hostnamectl]: 74
@[9]: 79
@[systemd-journal]: 115
@[bc]: 180
@[direnv]: 196
@[awk]: 270
@[sqlx-sqlite-wor]: 276
@[systemd]: 324
@[grepconf.sh]: 327
@[grep]: 460
@[systemd-hostnam]: 474
@[gix::status::tr]: 607
@[atuin]: 705
@[git]: 1578
@[starship]: 1731
@[gix_status::dir]: 2680
@[(ostnamed)]: 2859
@[gitoxide.in_par]: 26556
@[zsh]: 88158
__GI___clone3 ▒
start_thread ▒
- 0x56020664a3f2 ▒
- 97.08% wget_http_get_response_cb ▒
- 92.42% wget_tcp_read ▒
- 90.79% wget_ssl_read_timeout ▒
- 88.31% wget_ready_2_read ▒
- 87.66% wget_ready_2_transfer ▒
- 86.13% __poll ▒
- 85.64% __syscall_cancel ▒
- 82.45% __syscall_cancel_arch_end ▒
- 66.92% entry_SYSCALL_64_after_hwframe ▒
- do_syscall_64 ▒
- 60.38% __x64_sys_poll ▒
- 52.82% do_sys_poll ▒
- 26.95% do_poll.constprop.0 ▒
- 11.16% sock_poll ▒
- tcp_poll ▒
- 4.70% add_wait_queue ▒
3.48% __raw_spin_lock_irqsave ▒
2.53% __pollwait ▒
0.66% _raw_spin_unlock_irqrestore ▒
- 7.71% select_estimate_accuracy ▒
- 4.29% ktime_get_ts64 ▒
3.29% read_tsc ▒
3.03% fdget ▒
2.29% fput ▒
+ 6.75% poll_freewait ▒
4.78% _copy_from_user ▒
0.88% __check_object_size.part.0 ▒
+ 5.11% ktime_get_ts64 ▒
2.83% arch_exit_to_user_mode_prepare.isra.0
9.56% entry_SYSCALL_64 ▒
1.36% entry_SYSCALL_64_safe_stack ▒
0.67% syscall_return_via_sysret ▒
2.68% __internal_syscall_cancel ▒
2.34% nghttp2_session_mem_recv2 ▒
1.49% nghttp2_session_want_write
简单观察，发现
@[
tcp_poll+5
sock_poll+81
do_poll.constprop.0+286
do_sys_poll+482
__x64_sys_poll+206
do_syscall_64+132
entry_SYSCALL_64_after_hwframe+118
]: 1770722
0 S martins3 2914848 1 99 80 0 - 27328 futex_ Oct24 ? 21:26:27 wget --header User-Agent: mason.nvim v2.1.0 (+https://github.com/mason-org/mason.nvim) -o /dev/null -O /home/martins3/.local/share/nvim/mason/registries/github/mason-org/mason-registry/registry.json.zip -T 30 https://github.com/mason-org/mason-registry/releases/download/2025-10-24-lazy-chrome/registry.json.zip
0 S martins3 2916855 1 99 80 0 - 27330 futex_ Oct24 ? 21:20:32 wget --header User-Agent: mason.nvim v2.1.0 (+https://github.com/mason-org/mason.nvim) -o /dev/null -O /home/martins3/.local/share/nvim/mason/registries/github/mason-org/mason-registry/registry.json.zip -T 30 https://github.com/mason-org/mason-registry/releases/download/2025-10-24-lazy-chrome/registry.json.zip
pkill wget ，所有的问题都解决了。
2025 总结
有意思的东西
https://scottjg.com/posts/2026-05-05-egpu-mac-gaming/
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