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
450
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
ルーターでプレゼンする
puhitaku
1
3.5k
AST as Black Magic
puhitaku
0
70
次世代の足下を舗装するコミュニティ
puhitaku
5
1.6k
USB PD で迎える AC アダプター大統一時代
puhitaku
2
2.4k
電子辞書のアイデンティティを消す方法
puhitaku
3
3.6k
リセットとフリーズで解析する電子辞書リバエン記 / reverse-engineer-e-dictionaries-with-reset-and-freeze
puhitaku
2
6.1k
詳解・電子辞書で Linux がブートするまで / boot-linux-on-sharp-brain-explained
puhitaku
5
3.6k
MicroPython × BLE × テプラ 〜リバースエンジニアリングを添えて〜 /micropython-ble-tepra
puhitaku
2
710
TEPRA Lite ではじめる BLE リバースエンジニアリング / tepra-lite-ble-reverse-engineering
puhitaku
9
5.8k
Other Decks in Technology
See All in Technology
LINEヤフーのウェブアクセシビリティ
lycorptech_jp
PRO
3
210
AWS アーキテクチャ作図入門/aws-architecture-diagram-101
ma2shita
16
6.7k
能動学習のいろは:書籍「Human-in-the-Loop機械学習」3〜5章
hiroyoshiito
0
310
グイグイ系QAエンジニアでやっていくよ!
____rina____
0
790
#phpconkagawa レガシーコードにもオブザーバビリティを 〜少しずつ始めるサービス監視〜
yamato_sorariku
0
570
Dungeons and Dragons and Rails
joelq
0
260
Autonomous Database Cloud 技術詳細 / adb-s_technical_detail_jp
oracle4engineer
PRO
15
36k
[PyconUS 2024] Having fun with Pydantic and pattern matching
enforcerpl
0
200
マルチテナントマルチクラスタKubernetesでもUXを損なわない認証認可の勘所
pfn
PRO
0
120
TDD - Test Driven Drupal
opdavies
0
3k
RubyKaigi 2024 - Make Your Own Regex Engine!
makenowjust
1
180
TypescriptでのContextualな構造化ロギングと社内全体への導入
leveragestech
3
620
Featured
See All Featured
Put a Button on it: Removing Barriers to Going Fast.
kastner
58
3.1k
Distributed Sagas: A Protocol for Coordinating Microservices
caitiem20
323
20k
Easily Structure & Communicate Ideas using Wireframe
afnizarnur
188
16k
The Straight Up "How To Draw Better" Workshop
denniskardys
228
130k
The Illustrated Children's Guide to Kubernetes
chrisshort
32
47k
Build your cross-platform service in a week with App Engine
jlugia
226
17k
Typedesign – Prime Four
hannesfritz
36
2.1k
The Language of Interfaces
destraynor
151
23k
Principles of Awesome APIs and How to Build Them.
keavy
121
16k
The Pragmatic Product Professional
lauravandoore
26
5.9k
Build The Right Thing And Hit Your Dates
maggiecrowley
25
2k
ParisWeb 2013: Learning to Love: Crash Course in Emotional UX Design
dotmariusz
104
6.7k
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