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Auriya

Profile Scheduler

The scheduler is the daemon’s decision core: once per tick it decides which performance profile the device should be in and applies it. This page documents the exact decision function; for the system-level view and the tables of what each profile writes, see Architecture overview — this page is the source-precise companion to it, not a duplicate.

Traced to Auriya commit 10fe7c6, src/daemon/tick.rs and src/daemon/run.rs.

Decision order

Section titled “Decision order”

Daemon::process_tick_logic (tick.rs:91-192) evaluates conditions in strict priority order; the first matching branch wins and no lower branch runs:

flowchart TD
    tick([Tick Triggered]) --> branch1{"1. Screen OFF or<br/>Battery Saver ON?"}
    branch1 -->|yes| act1["POWERSAVE + Low ceiling<br/>+ detach eBPF + disable game DnD"]
    branch1 -->|no| branch2{"2. IPC foreground override<br/>(INJECT) exists?"}

    branch2 -->|yes| act2["Treat injected package as foreground"]
    branch2 -->|no| branch3{"3. Companion reports<br/>focused package?"}

    branch3 -->|no| act3["Default mode<br/>+ release game-owned state"]
    branch3 -->|yes| branch4{"4. Same package &<br/>tracked PID alive?"}

    branch4 -->|yes| act4["Fast path: FAS adjusts if available;<br/>Profile NOT reapplied"]
    branch4 -->|no| branch5{"5. Package is whitelisted?"}

    branch5 -->|yes| val_pid{"Validate PID against /proc"}
    val_pid -->|valid| act5["Enter / update game session"]
    val_pid -->|invalid| act3

    branch5 -->|no| act6["6. Default mode<br/>+ release game-owned state"]

Screen-off / battery-saver is checked first and unconditionally, so it wins even while a game is foregrounded. The injected override (2) exists for debugging via INJECT (see Game detection).

The idempotence guard

Section titled “The idempotence guard”

Profiles are only (re)applied when the target differs from what is already active: if self.last.profile_mode != Some(target_mode) (tick.rs:260, and the mirror check on the clear path, tick.rs:323). Repeated ticks in a steady state therefore do not rewrite kernel nodes — a tick that changes nothing performs no writes.

Entering a whitelisted game

Section titled “Entering a whitelisted game”

When branch 5 validates a live PID, handle_whitelisted_app (tick.rs:194-307) runs the game-session setup. The full ordered sequence (vendor lock, toast broadcast, mode resolution, ceiling, refresh rate, eBPF attach, DnD, PID tracker) is enumerated in Architecture overview → Entering a whitelisted game. Source-level specifics worth pinning here:

  • Mode resolution is case-insensitive with a Performance default. powersave → Powersave, balance → Balance, fast → Fast, anything else or missing → Performance (tick.rs). A typo silently resolves to Performance.
  • Governor fallback: an empty per-game cpu_governor falls back to the global balance_governor (tick.rs).
  • Ceiling: an unparseable per-game ceiling string is dropped to no-override, not an error (tick.rs).
  • Refresh rate is only requested when it differs from the currently applied rate (tick.rs), and released (request 0) when leaving (tick.rs).

What each profile actually writes to the kernel is the single-source-of-truth table in Architecture overview → What each static profile changes.

FAS adjustments within a session

Section titled “FAS adjustments within a session”

On the fast path (branch 4), if Frame-Aware Scheduling exists it consumes the Kala frame stream and picks one scaling action per tick. The action→effect mapping (BoostGpu, BoostCpu, BoostBalanced, Maintain, Reduce) is documented in Architecture overview → FAS dynamic changes. The frame-measurement mechanism itself is in Kala eBPF frame probe.

Leaving a game / no foreground

Section titled “Leaving a game / no foreground”

The clear path (apply_balance_and_clear, tick.rs) applies daemon.default_mode only if it differs from the current mode, then restores default ceiling, detaches eBPF, requests normal notifications (DnD All), releases any refresh-rate override (request 0), unlocks vendor controls, and clears the PID tracker.

The current_profile file

Section titled “The current_profile file”

On each applied profile change the daemon also writes /data/adb/.config/auriya/current_profile (update_current_profile_file, run.rs, called from tick.rs). It contains a single digit:

Value Profile
1 Performance
2 Balance
3 Powersave
4 Fast

This is a legacy/compatibility status output for external readers. It is best-effort (write failures are logged, not fatal) and is not the authoritative UI state — live daemon status over IPC is. See Filesystem reference.

Error handling

Section titled “Error handling”

A failed profile application logs an error and leaves last.profile_mode unchanged, so the next tick retries (tick.rs:274-279, 330-335). A tick that errors does not terminate the loop; identical errors are debounced for 30 s (see Architecture overview → Event loop).

Likely to drift first

Section titled “Likely to drift first”

The branch order and the mode/ceiling parsing defaults. Re-verify against Daemon::process_tick_logic and handle_whitelisted_app in src/daemon/tick.rs.