Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
電子辞書で学ぶ Linux のサスペンド
Search
Takumi Sueda
March 11, 2023
Technology
0
720
電子辞書で学ぶ Linux のサスペンド
情報科学若手の会 春の陣 2023 #wakate2023s
Takumi Sueda
March 11, 2023
Tweet
Share
More Decks by Takumi Sueda
See All by Takumi Sueda
令和最新版 OpenWrt を 22 年前のルーターで動かす
puhitaku
0
970
組み込みLinuxの時系列
puhitaku
4
1.7k
電子辞書にステータスバーを実装する
puhitaku
0
310
知育おもちゃの遊び方 Lv. 999
puhitaku
5
3.1k
ルーターでプレゼンする
puhitaku
1
6.4k
AST as Black Magic
puhitaku
0
150
次世代の足下を舗装するコミュニティ
puhitaku
5
1.8k
USB PD で迎える AC アダプター大統一時代
puhitaku
2
2.7k
電子辞書のアイデンティティを消す方法
puhitaku
3
4.1k
Other Decks in Technology
See All in Technology
使いやすいプラットフォームの作り方 ー LINEヤフーのKubernetes基盤に学ぶ理論と実践
lycorptech_jp
PRO
1
160
Automating Web Accessibility Testing with AI Agents
maminami373
0
1.3k
JTCにおける内製×スクラム開発への挑戦〜内製化率95%達成の舞台裏/JTC's challenge of in-house development with Scrum
aeonpeople
0
270
Modern Linux
oracle4engineer
PRO
0
160
まずはマネコンでちゃちゃっと作ってから、それをCDKにしてみよか。
yamada_r
2
120
株式会社ログラス - 会社説明資料【エンジニア】/ Loglass Engineer
loglass2019
4
65k
KotlinConf 2025_イベントレポート
sony
1
140
dbt開発 with Claude Codeのためのガードレール設計
10xinc
2
1.3k
AI時代を生き抜くエンジニアキャリアの築き方 (AI-Native 時代、エンジニアという道は 「最大の挑戦の場」となる) / Building an Engineering Career to Thrive in the Age of AI (In the AI-Native Era, the Path of Engineering Becomes the Ultimate Arena of Challenge)
jeongjaesoon
0
260
COVESA VSSによる車両データモデルの標準化とAWS IoT FleetWiseの活用
osawa
1
400
roppongirb_20250911
igaiga
1
250
OCI Oracle Database Services新機能アップデート(2025/06-2025/08)
oracle4engineer
PRO
0
180
Featured
See All Featured
[RailsConf 2023] Rails as a piece of cake
palkan
57
5.8k
10 Git Anti Patterns You Should be Aware of
lemiorhan
PRO
656
61k
The Power of CSS Pseudo Elements
geoffreycrofte
77
6k
Statistics for Hackers
jakevdp
799
220k
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
stephaniewalter
285
14k
Learning to Love Humans: Emotional Interface Design
aarron
273
40k
Designing Experiences People Love
moore
142
24k
Imperfection Machines: The Place of Print at Facebook
scottboms
268
13k
Testing 201, or: Great Expectations
jmmastey
45
7.7k
Facilitating Awesome Meetings
lara
55
6.5k
Understanding Cognitive Biases in Performance Measurement
bluesmoon
29
1.9k
Done Done
chrislema
185
16k
Transcript
2023 #wakate 2023 s Linux aka @puhitaku
2 Takumi Sueda @puhitaku HOMMA Inc. OSS etc. 3 D
2014
Linux Linux 3 5 3
SHARP Brain SHARP Brain 4
SHARP Brain SHARP Brain PW-SH 1 SHARP 2008 Windows CE
2020 CE exe Brain 2ch Brain Windows CE Wikipedia matplotlib 5
SHARP Brain 6 DRAM: LPDDR 128 MB eMMC: 8 GB
SD Raspberry Pi LCD CPU: NXP i.MX 2 83 ARM 926 EJ-S, armv 5 tej 4 54 MHz LCD: 8 00 x 48 0 SD: SDXC :
SHARP Brain SHARP Brain PW-SH 1 U-Boot Linux 2020 Brain
U-Boot Linux Raspberry Pi SD Linux LCD SD / eMMC etc ... 7
SHARP Brain SHARP Brain PW-SH 1 cpufreq CPU 8 🤔
SHARP Brain SHARP Brain PW-SH 1 cpufreq CPU 9 🤔
None
Suspend-to-Idle Standby Suspend-to-RAM Hibernation Linux 11 "sleep", "system-wide sleep"
1 . Suspend-to-Idle 2 . Standby 😴 Userspace 😴 Timekeeping
tick, 😴 I/O CPU CPU 😴 Suspend-to-Idle 😴 Non-boot CPU 3 . Suspend-to-RAM 😴 Standby 😴 CPU DRAM DRAM 4 . Hibernation 😴 CPU
1 . Suspend-to-Idle 2 . Standby 😴 Userspace 😴 Timekeeping
😴 I/O CPU CPU 😴 Suspend-to-Idle 😴 Non-boot CPU 3 . Suspend-to-RAM 😴 Standby 😴 CPU DRAM DRAM 4 . Hibernation 😴 CPU Suspend-to-RAM
Suspend-to-RAM
Suspend-to-RAM 1 . 2 . 3 . & 4 .
Non-boot CPU CPU IRQ Boot CPU 5 . tick 6 . RAM 7 . Suspend-to-RAM 15
Suspend-to-RAM 1 . 2 . CPU 3 . 4 .
tick 5 . Non-boot CPU 6 . IRQ 7 . (thaw = ) 8 . Suspend-to-RAM 16
Suspend-to-RAM
Suspend-to-RAM Suspend-to-RAM 2 18 Brain SoC MOSFET GPIO SPI, I²C
graceful dev_pm_ops Device Tree Power Management Subsystem ISR Brain GPIO
Suspend-to-RAM /sys/power/state write 19 i.MX 28 Device Tree LCD Suspend-to-RAM
Device Tree
Suspend-to-RAM 20 Suspend-to-RAM 1. pm_wakeup_event PM subsystem 2 . suspend_enter
CPU PC CPU /drivers/input/keyboard/gpio_keys.c L 44 3 (Linux 5 . 4 . 2 3 4 ) /kernel/power/suspend.c L 5 02 (Linux 5 . 4 . 2 34 )
Brain
Brain ✅ Suspend-to-RAM ✅ GPIO ⬜ MCU I²C I²C ISR
Windows ⬜ LCD FET ENABLE GPIO regulator Device Tree ⬜ ⬜ OS Suspend-to-RAM 22
suspend_prepare suspend_freeze_processes [1] userspace [ 1 ] https://elixir.bootlin.com/linux/v 5 .
4 . 23 4 /source/kernel/power/power.h#L 250 Q. kthread userspace 23 Q. 4 SoC Suspend-to-Idle Brain SoC 115mA 86 mA [1] Brain Standby Suspend-to-Idle Suspend-to-RAM LCD [ 1 ] https://twitter.com/puhitaku/status/ 1 62 984 98 629 24 6484 55
Bootlin Elixir: https://elixir.bootlin.com/linux/v 5 . 4 . 2 34 /
Mainline Linux /Documentation/admin-guide/pm/suspend- fl ows.rst /Documentation/admin-guide/pm/sleep-states.rst 24