jochen
b098b64b22
The laptop model's hardware module and a memory-pressure module for any machine (hq research 027/03, 026/05, to-be 42 phase 3). The predecessor's polling auto-profile and mem-guard user scripts become each module's own Go code launched by the node runtime (ADR 0198): a profile switcher woken by the kernel's power-supply uevents, and a guard that warns on RAM, swap or PSI before systemd-oomd acts, on the desktop over the account's bus and always as an event. supergfxctl and triggerhappy are kept as found (research 027 Q1).
122 lines
4.5 KiB
JSON
122 lines
4.5 KiB
JSON
{
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"module": "memory-pressure",
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"version": "1",
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"capabilities": [
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"package-manager",
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"service-manager"
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],
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"emits": [
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"pressure.high",
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"pressure.cleared"
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],
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"tools": [
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"memory_status",
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"memory_top",
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"memory_oom_history",
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"memory_zram",
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"memory_oomd",
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"memory_guard"
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],
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"resources": [
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{
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"id": "zram-generator",
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"type": "package",
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"package": "zram-generator"
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},
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{
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"id": "zram",
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"type": "file",
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"path": "/etc/systemd/zram-generator.conf",
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"mode": "0644",
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"content": "# Managed by the mesh (module memory-pressure). Replaced on every push; edit the catalogue instead.\n#\n# Compressed swap in RAM: fast, at a higher priority than any swap on disk, so it takes the everyday\n# pressure before anything spills to a disk. Half the RAM, at most 16 GiB, compressed with zstd.\n# The swap on disk, its size and whether one exists at all are the machine's, not this module's.\n#\n# Read by the generator at boot: a change applies at the next boot.\n[zram0]\nzram-size = min(ram / 2, 16384)\ncompression-algorithm = zstd\nswap-priority = 100\n"
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},
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{
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"id": "sysctl-drop-ins",
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"type": "directory",
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"path": "/etc/sysctl.d",
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"mode": "0755"
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},
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{
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"id": "swap-tunables",
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"type": "file",
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"path": "/etc/sysctl.d/90-memory-pressure.conf",
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"mode": "0644",
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"content": "# Managed by the mesh (module memory-pressure). Replaced on every push; edit the catalogue instead.\n#\n# Swap-in reads one page, not eight: read-ahead exists to amortise a disk's seek, and compressed swap in\n# RAM has none — the speculation only costs decompression and memory.\nvm.page-cluster = 0\n#\n# vm.swappiness is deliberately left alone. The usual zram advice (150-180) holds only while the\n# compressed swap has room; once it is full, a higher swappiness moves pages to the disk swap, the thing\n# being avoided. Raise it only together with zram-size.\n"
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},
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{
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"id": "sysctl",
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"type": "service",
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"unit": "systemd-sysctl.service",
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"restart-on": [
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"swap-tunables"
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]
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},
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{
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"id": "oomd-drop-ins",
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"type": "directory",
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"path": "/etc/systemd/oomd.conf.d",
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"mode": "0755"
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},
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{
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"id": "oomd-limits",
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"type": "file",
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"path": "/etc/systemd/oomd.conf.d/memory-pressure.conf",
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"mode": "0644",
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"content": "# Managed by the mesh (module memory-pressure). Replaced on every push; edit the catalogue instead.\n#\n# systemd-oomd kills the worst unit before the kernel's OOM killer freezes the machine: when swap is\n# 90 % used, or when a watched unit stalls on memory for 20 s above its limit.\n[OOM]\nSwapUsedLimit=90%\nDefaultMemoryPressureLimit=60%\nDefaultMemoryPressureDurationSec=20s\n"
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},
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{
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"id": "root-slice-drop-ins",
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"type": "directory",
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"path": "/etc/systemd/system/-.slice.d",
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"mode": "0755"
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},
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{
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"id": "root-slice",
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"type": "file",
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"path": "/etc/systemd/system/-.slice.d/10-oomd.conf",
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"mode": "0644",
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"content": "# Managed by the mesh (module memory-pressure). Replaced on every push; edit the catalogue instead.\n#\n# systemd-oomd may act on swap exhaustion across the whole machine.\n[Slice]\nManagedOOMSwap=kill\n"
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},
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{
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"id": "user-manager-drop-ins",
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"type": "directory",
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"path": "/etc/systemd/system/user@.service.d",
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"mode": "0755"
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},
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{
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"id": "user-manager",
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"type": "file",
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"path": "/etc/systemd/system/user@.service.d/10-oomd.conf",
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"mode": "0644",
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"content": "# Managed by the mesh (module memory-pressure). Replaced on every push; edit the catalogue instead.\n#\n# systemd-oomd may kill the worst unit in a person's service manager when its memory pressure stays\n# above 80 % — instead of the kernel freezing the machine.\n[Service]\nManagedOOMMemoryPressure=kill\nManagedOOMMemoryPressureLimit=80%\n"
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},
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{
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"id": "oomd",
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"type": "service",
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"unit": "systemd-oomd.service",
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"state": "running",
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"boot": "enabled",
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"restart-on": [
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"oomd-limits",
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"root-slice",
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"user-manager"
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]
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}
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],
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"build": {
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"artifacts": [
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{
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"name": "tools-go",
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"kind": "bundle",
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"language": "go",
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"system": "arch",
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"from": "cmd/memory-pressure",
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"binary": "memory-pressure",
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"loads": [
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"memory-pressure"
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]
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}
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]
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}
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}
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