jschoubben
eb72075104
Tests that read ../../../mesh-catalog or ../../../mesh-host gave a verdict that depended on what sat beside the checkout: a stale or dirty sibling failed them on a desktop, and a missing one skipped them unseen. They now read the clone the build seat puts in MESH_CHECK_BESIDE, failing when it is absent there, and elsewhere a copy captured at a named commit. The skip had hidden that the builder test read a module retired by ADR 0190. The systemd reading test no longer counts the machine's own environment.d.
122 lines
4.5 KiB
Plaintext
122 lines
4.5 KiB
Plaintext
{
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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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