userspace-resource-manager-extensions

5. Signals Reference

Custom signals defined in Configs/SignalsConfig.yaml and target-specific overrides.

Signal Code Reference

Signal Name Full Code Category SigId Description
URM_APP_OPEN 0x00010001 0x01 App Lifecycle 0x0001 Generic app open event
URM_SIG_VIDEO_DECODE 0x00030001 0x03 Multimedia 0x0001 Video decode workload
URM_SIG_CAMERA_PREVIEW 0x00030002 0x03 Multimedia 0x0002 Camera preview workload
URM_SIG_CAMERA_ENCODE 0x00030003 0x03 Multimedia 0x0003 Camera encode workload
URM_SIG_CAMERA_ENCODE_MULTI_STREAMS 0x00030004 0x03 Multimedia 0x0004 Multi-stream camera encode
RT_TRIGGER 0x00800001 0x80 RT Workload 0x0001 Real-time workload trigger
GENIE_T2T_RUN 0x00f10123 0xf1 Special 0x0123 AI inference (token-to-token) run

Generic Signals (Configs/SignalsConfig.yaml)

URM_APP_OPEN (Category 0x01, SigId 0x0001)

Fired when any application opens. Applies cgroup tuning for the foreground app. Permissions: system, third_party

Resources applied: | ResCode | Values | Effect | |———|——–|——–| | RES_CGRP_RUN_CORES | [2, 0,1,2,3] | Restrict background cgroup (id=2) to little cores | | RES_CGRP_CPU_LATENCY | [4, -20] | Set CPU latency hint for focused cgroup (id=4) |

RT_TRIGGER (Category 0x80, SigId 0x0001)

Fired to trigger real-time workload mode. Timeout: -1 (indefinite). Permissions: system, third_party

Resources applied: | ResCode | ResInfo | Values | Effect | |———|———|——–|——–| | 0x00030003 | - | [-1] | Disable CPU scaling | | 0x00800000 | - | [0] | Disable timer migration | | 0x00800001 | - | [0] | Set CPU freq governor (callback) | | 0x00800002 | - | [0] | Configure IRQ affinity (callback) | | 0x00800003 | - | [0] | Configure WQ affinity (callback) | | 0x00040003 | 0x00000000 | [1] | Isolate little cores (cluster 0) | | 0x00040004 | 0x00000100 | [1] | Isolate big cores (cluster 1) | | 0x00040005 | 0x00000200 | [1] | Isolate prime cores (cluster 2) |

GENIE_T2T_RUN (Category 0xf1, SigId 0x0123)

Fired for AI inference (token-to-token) workloads. Timeout: -1 (indefinite). Permissions: system, third_party

Resources applied: | ResCode | ResInfo | Values | Effect | |———|———|——–|——–| | 0x00f00001 | 0x00000000 | [0,1,2,3,4,5] | Affinize all IRQs to cores 0-5 | | 0x00090002 | 0x00000000 | [2,0,1,2,3,4,5] | CPU affinity for inference threads |

Target-Specific Signals

Signal Type (SigType) Explained

SigType is a variant selector. When the post-processor detects a workload, it sets SigType based on load intensity. URM then selects the matching signal config entry.

For video decode:

SigType Meaning Trigger Condition
0 Default (low load) 0-4 concurrent decode sessions
5 Medium load 5-20 concurrent decode sessions
20 High load 20+ concurrent decode sessions

For camera encode multi-stream:

SigType Meaning Trigger Condition
0 Normal load 0-12 encoder instances
8 Medium load (qcm6490 only) 8-12 encoder instances
12 or 13 High load 12+ encoder instances

QCM6490 Signal Tuning (Configs/target-specific/qcm6490/SignalsConfig.yaml)

CPU cluster layout: cores 0-3 (little), cores 4-6 (big)

Signal SigType Little Max Freq Big Max Freq Plus Max Freq
URM_SIG_VIDEO_DECODE 0 (default) 940800 940800 940800
URM_SIG_VIDEO_DECODE 5 (5-20 sessions) 940800 1900800 940800
URM_SIG_VIDEO_DECODE 20 (20+ sessions) (no freq cap) (no freq cap) (no freq cap)
URM_SIG_CAMERA_PREVIEW 0 (default) 940800 940800 940800
URM_SIG_CAMERA_ENCODE 0 (default) 1804800 1900800 940800
URM_SIG_CAMERA_ENCODE_MULTI_STREAMS 0 (0-12 streams) 1804800 940800 940800
URM_SIG_CAMERA_ENCODE_MULTI_STREAMS 8 (8-12 streams) 1804800 1900800 1900800
URM_SIG_CAMERA_ENCODE_MULTI_STREAMS 12 (12+ streams) (no freq cap) (no freq cap) (no freq cap)

All signals also apply cgroup tuning:

Cgroup Cores CPU Weight Memory
Background (cgroup 2) 0,1,2,3 - -
System (cgroup 3) 4,5,6 90 HIGH: 1048576
Focused (cgroup 4) 0,1,2,3,4,5,6 150 LOW: 507256, MIN: 116631

Note: For SigType 20 (20+ decode sessions) and SigType 12 (12+ encode streams), no CPU frequency cap is applied - all cores are available.

QCS8300 Signal Tuning (Configs/target-specific/qcs8300/SignalsConfig.yaml)

CPU cluster layout: cores 0-3 (little), cores 4-7 (big)

Signal SigType Little Max Freq Big Max Freq Plus Max Freq
URM_SIG_VIDEO_DECODE 0 (default) 1200000 1200000 1200000
URM_SIG_VIDEO_DECODE 5 (5-20 sessions) 1500000 1500000 1500000
URM_SIG_VIDEO_DECODE 20 (20+ sessions) (no freq cap) (no freq cap) (no freq cap)
URM_SIG_CAMERA_PREVIEW 0 (default) 1200000 1200000 1200000
URM_SIG_CAMERA_ENCODE 0 (default) 1200000 1200000 1200000
URM_SIG_CAMERA_ENCODE_MULTI_STREAMS 0 (0-12 streams) 1500000 1500000 1500000
URM_SIG_CAMERA_ENCODE_MULTI_STREAMS 12 (12+ streams) (no freq cap) (no freq cap) (no freq cap)

All signals apply the same cgroup tuning as QCM6490 but with 8 cores (0-7).

QCS9100/QCS9075 Signal Tuning (Configs/target-specific/qcs9100/SignalsConfig.yaml)

CPU cluster layout: cores 0-3 (little), cores 4-7 (big) Note: qcs9075 uses the same config as qcs9100 (TargetsEnabled includes both). All signals have Timeout: -1 (indefinite hold).

Signal SigType Little Max Freq Big Max Freq
URM_SIG_VIDEO_DECODE 0 (default) 1267200 1267200
URM_SIG_VIDEO_DECODE 5 (5+ sessions) 1536000 1536000
URM_SIG_VIDEO_DECODE 20 (20+ sessions) (no freq cap) (no freq cap)
URM_SIG_CAMERA_PREVIEW 0 (default) 1267200 1267200
URM_SIG_CAMERA_ENCODE 0 (default) 1267200 1267200
URM_SIG_CAMERA_ENCODE_MULTI_STREAMS 0 (0-12 streams) 1267200 1267200
URM_SIG_CAMERA_ENCODE_MULTI_STREAMS 13 (12+ streams) (no freq cap) (no freq cap)

Note: QCS9100/9075 does not have a CLUSTER_PLUS (third cluster); only little and big.

Cross-Target Comparison

Signal SigType QCM6490 Little QCS8300 Little QCS9100 Little
VIDEO_DECODE 0 940800 1200000 1267200
VIDEO_DECODE 5 940800 1500000 1536000
CAMERA_PREVIEW 0 940800 1200000 1267200
CAMERA_ENCODE 0 1804800 1200000 1267200
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