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App hibernation🥶 DroidKaigi: ϥϯνλΠϜLTձ Vol.1

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ࣗݾ঺հ • Shinobu Okano • @operandoOS / shinobu.dart • 10X, Inc. / Software Engineer • Flutter / Dart / Android / Automation

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App hibernationͱ͸ʁ • Android 12͔Βೖͬͨ࢓૊Έ • ਺ϲ݄ར༻͞Ε͍ͯͳ͍ΞϓϦΛγεςϜ͕hibernation stateʹ 
 ͠·͢Αʔͬͯ΍ͭ • Android 11Ͱಋೖ͞ΕͨAuto-reset permissionsΛਐԽͤͨ͞΍ͭ

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App hibernationͱ͸ʁ https://developer.android.com/topic/ performance/app-hibernation

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Android11͔Βಋೖ͞ΕͨAuto-reset permissionsΛௐ΂ͯΈͯΘ͔ͬͨ͜ͱ https://hack-it-iron.hatenablog.com/entry/ 2020/12/14/081217

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hibernation͕ΞϓϦʹ༩͑ΔӨڹ

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Making permissions auto-reset available to billions more devices https://android- developers.googleblog.com/2021/09/ making-permissions-auto-reset- available.html

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γεςϜ͕ΞϓϦΛ࢖༻͍ͯ͠ΔͱΈͳ͢Ξ Ϋγϣϯ͸ͳʹ͔ʁ

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γεςϜ͕ΞϓϦΛ࢖༻͍ͯ͠ΔͱΈͳ͢Ξ Ϋγϣϯ͸ͳʹ͔ʁ

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υΩϡϝϯτΛಡΜͰٙ໰ʹࢥͬͨ͜ͱ • ਺ϲ݄ར༻͞Ε͍ͯͳ͍ͬͯ۩ମతͳ਺ࣈ͸ʁ • Ͳͷ͘Β͍ͷස౓ͰhibernationͷνΣοΫ͕ߦΘΕΔͷ͔ʁ • App usageͬͯͲ͏΍ͬͯΧ΢ϯτͯ͠Δͷ͔ʁ • hibernation statusͳΞϓϦͷ࣮ߦ੍ޚΛͲ͏΍ͬͯ΍ͬͯΔͷ ͔ʁ

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਺ϲ݄ར༻͞Ε͍ͯͳ͍ͬͯ۩ମతͳ਺ࣈ ͸ʁ • σϑΥϧτͰ͸90೔ؒ = ໿ࡾϲ݄ • ݁ߏ௕͍Ͷʂ private val DEFAULT_UNUSED_THRESHOLD_MS = TimeUnit.DAYS.toMillis(90)

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਺ϲ݄ར༻͞Ε͍ͯͳ͍ͬͯ۩ମతͳ਺ࣈ ͸ʁ • ظؒͷ͖͍͠஋Λมߋ͢Δ͜ͱ͸Ͱ͖Δ // ະ࢖༻ظؒͷ͖͍͠஋Λ1෼ʹมߋ adb shell device_config put permissions auto_revoke_unused_threshold_millis2 60000 // ઃఆͰ͖͍ͯΔ͔Λ֬ೝ adb shell device_config get permissions auto_revoke_unused_threshold_millis2

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Ͳͷ͘Β͍ͷස౓ͰhibernationͷνΣοΫ ͕ߦΘΕΔͷ͔ʁ • σϑΥϧτͰ͸15೔ִؒ • ʢ͋Ε...ʁͦΜͳߴස౓͡Όͳ͍ͷͶ...😂ʣ private val DEFAULT_CHECK_FREQUENCY_MS = TimeUnit.DAYS.toMillis(15)

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Ͳͷ͘Β͍ͷස౓ͰhibernationͷνΣοΫ ͕ߦΘΕΔͷ͔ʁ • ͪ͜Β΋ස౓Λมߋ͢Δ͜ͱ͕Ͱ͖Δ // ࣮ߦपظΛ15෼ʹมߋ adb shell device_config put permissions auto_revoke_check_frequency_millis 900000 // ઃఆͰ͖͍ͯΔ͔Λ֬ೝ adb shell device_config get permissions auto_revoke_check_frequency_millis

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App usageͬͯͲ͏΍ͬͯΧ΢ϯτͯ͠Δͷ ͔ʁ • UsageStatsManager͔ΒͷϦεφʔΛड͚औΕΔ࢓૊Έ͕͋ ΓɺͦΕͰΧ΢ϯτ͍ͯ͠Δ • ͪͳΈʹΞϓϦ͕ར༻͞Ε͍ͯΔΠϕϯτ͕ඈΜͰ͖ͨΒɺ͙͢ ʹhibernation͔Βͷ෮ؼ͕࣮ߦ͞ΕΔ

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App usageͬͯͲ͏΍ͬͯΧ΢ϯτͯ͠Δͷ ͔ʁ private final UsageEventListener mUsageEventListener = (userId, event) -> { if (!isAppHibernationEnabled()) { return; } final int eventType = event.mEventType; if (eventType == UsageEvents.Event.USER_INTERACTION || eventType == UsageEvents.Event.ACTIVITY_RESUMED || eventType == UsageEvents.Event.APP_COMPONENT_USED) { final String pkgName = event.mPackage; setHibernatingForUser(pkgName, userId, false); setHibernatingGlobally(pkgName, false); } };

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hibernation statusͳΞϓϦͷ࣮ߦ੍ޚΛͲ ͏΍ͬͯ΍ͬͯΔͷ͔ʁ • Θ͔Βͳ͔ͬͨ...🙏

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ͦͷଞ ಺෦ߏ଄Λௐ΂ͯΘ͔ͬͨ͜ͱ • Android 12Ͱ͸Ancroid 11ͰͷAuto-reset permissionsͷ࣮ ૷͕HibernationPolicyͱ͔ʹมΘͬͯͦ͏ • AppHibernationService͸؅ཧ͢Δ໾ׂΛ΍͍ͬͯΔɻ HibernationController͸PermissionͳͲͷແޮԽͳͲͷॲཧ Λ͍ͯ͠Δɻ؅ཧͱ࣮ߦͰ໾ׂ͕෼͔Ε͍ͯΔͬΆ͍ɻ

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ͦͷଞ ಺෦ߏ଄Λௐ΂ͯΘ͔ͬͨ͜ͱ • adb shell dumpsys app_hibernation͢Ε͹ AppHibernationServiceΛdumpͰ͖Δ • hibernation͔Β෮ؼ͢ΔͱɺACTION_BOOT_COMPLETED ͱACTION_LOCKED_BOOT_COMPLETED͕broadcastͰൃՐ ͢Δ

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ͦͷଞ ಺෦ߏ଄Λௐ΂ͯΘ͔ͬͨ͜ͱ • hibernationͷ৘ใ͸ҎԼΈ͍ͨͳ৔ॴʹอଘ͍ͯ͠Δ • /data/system/hibernation/states • /data/system_ce/0/hibernation/states

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ࢀߟίʔυʢ͋Γ͗͢…😇ʣ • https://cs.android.com/android/platform/superproject/+/master:packages/modules/Permission/PermissionController/src/com/android/permissioncontroller/hibernation/ • https://cs.android.com/android/platform/superproject/+/master:frameworks/base/core/java/android/apphibernation/AppHibernationManager.java • https://cs.android.com/android/platform/superproject/+/master:packages/modules/Permission/PermissionController/src/com/android/permissioncontroller/hibernation/HibernationController.kt • https://cs.android.com/android/platform/superproject/+/master:frameworks/base/services/core/java/com/android/server/apphibernation/ • https://cs.android.com/android/platform/superproject/+/master:frameworks/base/services/core/java/com/android/server/apphibernation/AppHibernationService.java • https://cs.android.com/android/platform/superproject/+/master:frameworks/base/services/core/java/com/android/server/apphibernation/AppHibernationShellCommand.java • https://cs.android.com/android/platform/superproject/+/master:frameworks/base/services/core/java/com/android/server/apphibernation/GlobalLevelState.java • https://cs.android.com/android/platform/superproject/+/master:frameworks/base/services/core/java/com/android/server/apphibernation/UserLevelState.java • https://cs.android.com/android/platform/superproject/+/master:frameworks/base/services/core/java/com/android/server/apphibernation/HibernationStateDiskStore.java • https://cs.android.com/android/platform/superproject/+/master:packages/modules/Permission/PermissionController/src/com/android/permissioncontroller/hibernation/HibernationPolicy.kt • https://cs.android.com/android/platform/superproject/+/master:packages/modules/Permission/PermissionController/src/com/android/permissioncontroller/permission/service/ AutoRevokePermissions.kt • https://cs.android.com/android/platform/superproject/+/master:packages/apps/Settings/src/com/android/settings/applications/HibernatedAppsPreferenceController.java • https://cs.android.com/android/platform/superproject/+/master:frameworks/base/core/java/android/apphibernation/AppHibernationManager.java

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App hibernationͷ಺෦ߏ଄Ͳ͏ௐ΂͔ͨ • DroidKaigi 2021 ʮͰ͖ΔʂAndroid Framework Code Readingʯ • https://speakerdeck.com/operando/dekiru-android-framework- code-reading • https://www.youtube.com/watch? v=44ChiZXry1E&list=PLaOdaBFokChxuuWf0eXWaf5H35R1Aroaz • ͪ͜ΒΛͥͻࢀߟʹ🙏

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Thanks🙏