takeoverjp takeoverjp
takeoverjp
/ file0.txt
Created
December 2, 2018 21:29
クロスターゲットのLinuxブートプロセスをbootchartで描いてみる ref: https://qiita.com/takeoverjp/items/116ac6630d62e3985185
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| [host (x86_64)] | |
| $ sudo apt install qemu-system-arm | |
| $ wget https://github.com/xrmx/bootchart/releases/download/0.14.8/bootchart2-0.14.8.tar.bz2 | |
| $ tar xf bootchart2-0.14.8.tar.bz2 | |
| $ cd bootchart2-0.14.8 | |
| $ make |
takeoverjp
/ file0.txt
Created
May 19, 2018 16:59
Linux kernel debug用のプロセス一覧出力gdbコマンド ref: https://qiita.com/takeoverjp/items/a078b823d4716d0ba79b
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| #define next_task(p) \ | |
| list_entry_rcu((p)->tasks.next, struct task_struct, tasks) | |
| #define for_each_process(p) \ | |
| for (p = &init_task ; (p = next_task(p)) != &init_task ; ) |
takeoverjp
/ file0.txt
Last active
January 31, 2018 20:45
シェルスクリプトで複数のコマンド出力を結合する ref: https://qiita.com/takeoverjp/items/3f111c57453c51666958
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| $ TMP=`tempfile`; echo hoge > $TMP; echo fuga >> $TMP; cat $TMP; rm $TMP |
takeoverjp
/ file0.txt
Created
January 21, 2018 13:37
ARM64のsemihosting機能をQEMU上で試してみる ref: https://qiita.com/takeoverjp/items/08fcfcac655c0b60931b
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| $ sudo apt install gcc-5-aarch64-linux-gnu qemu-user-static |
takeoverjp
/ file0.txt
Last active
May 19, 2018 14:10
arm64(aarch64)のLinuxカーネルをQEMU上でgdbデバッグする ref: https://qiita.com/takeoverjp/items/5df8e17f0c361ecd3563
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| $ curl -O https://buildroot.org/downloads/buildroot-2017.02.9.tar.bz2 | |
| $ tar xf buildroot-2017.02.9.tar.bz2 | |
| $ cd buildroot-2017.02.9 | |
| $ make qemu_aarch64_virt_defconfig | |
| $ unset LD_LIBRARY_PATH | |
| $ make BR2_JLEVEL=`getconf _NPROCESSORS_ONLN` | |
| $ cd .. |
takeoverjp
/ file0.txt
Last active
November 14, 2017 12:56
ディスクイメージのサイズを大きくする ref: https://qiita.com/takeoverjp/items/a4015a5440aea712889c
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| # 空イメージファイルの作成 | |
| $ truncate -s 1GiB empty.img | |
| # イメージファイルの結合 | |
| $ cat not_enough.img empty.img > enough.img | |
| # 空きループバックデバイスの確認 | |
| $ losetup -f | |
| /dev/loop0 |
takeoverjp
/ file0.txt
Last active
November 15, 2017 13:51
RaspberryPi3 Model Bを64bitで動かす ref: https://qiita.com/takeoverjp/items/5bc9e34e7016bc5b5692
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| $ sudo apt install gcc-5-aarch64-linux-gnu | |
| $ sudo apt install kpartx |
takeoverjp
/ index.json.jbuilder
Created
March 31, 2016 01:31
[Rails] JSONを返すWebAPIに翻訳済み文字列を含める ref: http://qiita.com/takeoverjp/items/37f4f2decafba39f0a1b
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| json.array!(@users) do |user| | |
| json.kind t("enums.user.kind.#{user.kind}") | |
| end |
takeoverjp
/ transaction.rb
Last active
March 21, 2016 05:58
[Rails] 同じmodelを参照する外部キーを一つのmodelでもつ方法 ref: http://qiita.com/takeoverjp/items/bb56d6a8eae191cd3732
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| belongs_to :buyer, class_name: 'User', :foreign_key => 'buyer_id' | |
| belongs_to :seller, class_name: 'User', :foreign_key => 'seller_id' |
takeoverjp
/ file0.txt
Last active
March 20, 2016 09:49
JavaScriptの記述場所まとめ ref: http://qiita.com/takeoverjp/items/47a4b1804d2d964fcbed
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| if (HTMLレンダリング前に実行が必要？) | |
| →head tag without defer or async | |
| else if (HTMLレンダリング後に実行が必要？) | |
| if (他のJavaScriptとの依存関係はある？) | |
| →body tagの最後 | |
| else | |
| →head tag with defer | |
| else | |
| if (他のJavaScriptとの依存関係はある？) | |
| →body tagの最後 |
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