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Log memory use per component so an OOM kill can be explained afterwards - #18
On 2026-10-28 systemd-oomd killed the scope holding the hub, the daemon and every terminal, and nothing recorded which process held the memory. Now the daemon and the hub each append a JSON line per sample to a log in the state directory, so the next kill can be explained from the minutes before it:
memory.log (daemon): its own process.memoryUsage() and the estimated size of its terminal mirrors; per live terminal, the memory of its process tree and its largest processes; processes that escaped closed terminals; the rest of its cgroup (others); its cgroup's memory.current/peak/max/high/swap.current and pressure; system pressure and /proc/meminfo headroom.
hub-memory.log (hub): its own memory, its child processes (SSH links and the like, not the daemon it started), the rest of its cgroup, and the system figures.
A sample is taken every 60 s, and every 5 s while memory is tight (some avg10 ≥ 10, or MemAvailable under 10% of MemTotal), so the last lines land close to a kill. WTD_MEMORY_SAMPLE_MS overrides the 60 s. Each log rotates at 16 MiB and keeps three old files, owner-only. On a host without /proc or cgroup v2 (macOS) the missing sections are null and the rest is still logged.
Attributing leftovers
Every terminal's environment now carries WTD_TERMINAL=<daemon pid>/<daemon instance>/<termId>, and terminal ids are taken before the shell starts, so a failed start leaves a gap in the ids. This tag survives setsid and outlives the terminal, so the daemon can tell which terminal a leftover came from even after a daemon restart:
a process in a live terminal's session or below its shell is one of its members;
a process tagged with a live terminal of this daemon but outside it (e.g. setsid) is detached under that terminal;
a process tagged by another running wtd daemon is left to that daemon;
any other tagged process, or an untagged one in the session of a terminal this daemon closed, is escaped, grouped by tag, with the terminal's worktree and preset when this daemon closed it.
For example, setsid node hog.js & in a terminal followed by closing that terminal shows up as:
Records are bounded: the top 3 processes per terminal group and the top 5 elsewhere, commands cut to 200 characters, and at most 20 escaped groups, with the rest summed in escapedOmitted.
Where it lives
New platform.memory component: /proc and cgroup readers that parse at the boundary, group summaries, and the single-flight sampler. Processes are read 8 at a time, because each procfs read takes a 64 KiB buffer and a larger batch measurably raised the hub's RSS.
platform.files: the rotating whole-line appender and the two new paths.
daemon: TerminalProcess.pid and mirrorStats(), tagging and the closed-terminal list in Daemon, and the attribution in daemon/main/memory.ts.
hub/main/memory.ts: the hub's record.
Architecture: the new component and its three arrows in model.c4, the platform purpose and principle 4 ("log appends write whole lines"), regenerated diagrams, and the allowlist entry.
No protocol or UI change.
Tests
Unit tests cover the readers against fake /proc and cgroup trees, the cadence under a fake clock, rotation and its failure paths, and every attribution rule. Process tests run a real daemon and hub: a terminal's tree, a setsid escape, a SIGHUP-ignoring job that survives closeTerm, a detached child of a live terminal, a process tagged by a daemon that is gone, the SSH link as a hub child, the daemon not counted as one, and nothing written after shutdown. test/process/rss.test.ts is unchanged and passes with sampling on.
Full suite on the merged tree: lint, vitest 2617/2617, Playwright 192/192. The needs-login redial test in hub-router-remote.test.ts failed once in four full runs before the merge; it is a known flake tracked in DEV-2111.
Summary by CodeRabbit
New Features
Added rotating memory logs for the daemon and hub, with process, terminal, cgroup, and system memory details.
Memory sampling adjusts to system pressure and available memory. Logs are written with owner-only permissions.
Added terminal process attribution to help distinguish live sessions, detached processes, and other processes.
Documentation
Updated architecture documentation to include the memory component and its connections.
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The change adds platform memory readers and adaptive sampling, rotating memory logs for the daemon and hub, and process attribution for each component. It also updates terminal tracking, architecture documentation, specifications, and tests.
Adds process, cgroup v2, and system memory readers; adaptive sampling with a 60-second default and 5-second checks; and newline-delimited log appends with 16 MiB rotation and three backups. Tests cover parsing, sampling, rotation, permissions, and error handling.
Daemon terminal tagging and memory records src/daemon/main/*, src/daemon/server/*, src/daemon/terminals/*, test/process/memory-log.test.ts, openspec/changes/.../specs/daemon/spec.md
Tags terminal processes with WTD_TERMINAL, exposes live and recently closed terminal views, and builds daemon records that classify terminal members, detached processes, escaped groups, and other cgroup members. The daemon runs and stops its sampler with its lifecycle.
Hub memory records and sampling src/hub/main/*, test/process/memory-log.test.ts, openspec/changes/.../specs/hub/spec.md
Adds hub records for hub memory, descendants, cgroup members, and system readings. The descendant summary excludes the daemon subtree. The hub runs and stops its sampler with its lifecycle.
Architecture and change documentation architecture/*, README.md, openspec/changes/..., test/architecture/*, src/web/client/connection.ts
Adds the memory component and dependencies to architecture models and diagrams, updates architecture checks and OpenSpec change documents, and reformats the README table and hub-error condition without changing their described content or behavior.
sequenceDiagram
participant DaemonMain
participant startSampler
participant readMemory
participant daemonRecord
participant appendLogLine
DaemonMain->>startSampler: start sampling after listener serves
startSampler->>readMemory: collect process, cgroup, and system readings
startSampler->>daemonRecord: build a record using readings and terminal view
daemonRecord-->>startSampler: return record and closed terminal IDs
startSampler->>DaemonMain: forget closed terminal IDs
startSampler->>appendLogLine: append serialized record
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sequenceDiagram
participant HubMain
participant startSampler
participant readMemory
participant hubRecord
participant appendLogLine
HubMain->>startSampler: start sampling with hub identity and log path
startSampler->>readMemory: collect process, cgroup, and system readings
startSampler->>hubRecord: build a record using readings and daemon command
hubRecord-->>startSampler: return hub record
startSampler->>appendLogLine: append serialized record
HubMain->>startSampler: stop sampling after shutdown
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Possibly related PRs
MotleyAI/worktree-term#16: Changes terminal retirement behavior; this PR retains recently closed terminals and uses them for memory-process attribution.
Merge Risk: Low · previous review fd80e
On systems with PSI disabled, memory logs may omit otherwise available cgroup figures. This is a bounded logging gap that can be addressed with a localized fix.
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The title clearly and concisely describes the main change: recording per-component memory usage to explain later OOM kills.
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Split place to reduce its cognitive complexity.
SonarCloud reports a failure for this function. Its cognitive complexity is 24, and the allowed limit is 15. It also warns about await inside the loop at line 156.
The five rules are applied in one loop body with several continue branches. Extract the per-process decision into a helper. The helper returns a placement result: member, detached, foreign, escaped or none. The loop then only records the result. This also lets you unit-test each rule on its own.
The sequential await is intentional, so keep it in the helper. It keeps environ reads to one at a time.
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Inline comments:
Review comments at @src/platform/memory/sources.ts:
- Around line 105-112: Update readOptional to treat EOPNOTSUPP as an absent
source alongside errors recognized by isAbsent, returning null so pressure-file
failures do not discard the other cgroup values; continue to rethrow other
errors.
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Resolves DEV-2161.
What changes
On 2026-10-28 systemd-oomd killed the scope holding the hub, the daemon and every terminal, and nothing recorded which process held the memory. Now the daemon and the hub each append a JSON line per sample to a log in the state directory, so the next kill can be explained from the minutes before it:
memory.log(daemon): its ownprocess.memoryUsage()and the estimated size of its terminal mirrors; per live terminal, the memory of its process tree and its largest processes; processes that escaped closed terminals; the rest of its cgroup (others); its cgroup'smemory.current/peak/max/high/swap.currentand pressure; system pressure and/proc/meminfoheadroom.hub-memory.log(hub): its own memory, its child processes (SSH links and the like, not the daemon it started), the rest of its cgroup, and the system figures.A sample is taken every 60 s, and every 5 s while memory is tight (
some avg10≥ 10, orMemAvailableunder 10% ofMemTotal), so the last lines land close to a kill.WTD_MEMORY_SAMPLE_MSoverrides the 60 s. Each log rotates at 16 MiB and keeps three old files, owner-only. On a host without/procor cgroup v2 (macOS) the missing sections are null and the rest is still logged.Attributing leftovers
Every terminal's environment now carries
WTD_TERMINAL=<daemon pid>/<daemon instance>/<termId>, and terminal ids are taken before the shell starts, so a failed start leaves a gap in the ids. This tag survivessetsidand outlives the terminal, so the daemon can tell which terminal a leftover came from even after a daemon restart:setsid) is detached under that terminal;wtddaemon is left to that daemon;For example,
setsid node hog.js &in a terminal followed by closing that terminal shows up as:Records are bounded: the top 3 processes per terminal group and the top 5 elsewhere, commands cut to 200 characters, and at most 20 escaped groups, with the rest summed in
escapedOmitted.Where it lives
platform.memorycomponent:/procand cgroup readers that parse at the boundary, group summaries, and the single-flight sampler. Processes are read 8 at a time, because each procfs read takes a 64 KiB buffer and a larger batch measurably raised the hub's RSS.platform.files: the rotating whole-line appender and the two new paths.daemon:TerminalProcess.pidandmirrorStats(), tagging and the closed-terminal list inDaemon, and the attribution indaemon/main/memory.ts.hub/main/memory.ts: the hub's record.model.c4, the platform purpose and principle 4 ("log appends write whole lines"), regenerated diagrams, and the allowlist entry.No protocol or UI change.
Tests
Unit tests cover the readers against fake
/procand cgroup trees, the cadence under a fake clock, rotation and its failure paths, and every attribution rule. Process tests run a real daemon and hub: a terminal's tree, asetsidescape, a SIGHUP-ignoring job that survivescloseTerm, a detached child of a live terminal, a process tagged by a daemon that is gone, the SSH link as a hub child, the daemon not counted as one, and nothing written after shutdown.test/process/rss.test.tsis unchanged and passes with sampling on.Full suite on the merged tree: lint, vitest 2617/2617, Playwright 192/192. The needs-login redial test in
hub-router-remote.test.tsfailed once in four full runs before the merge; it is a known flake tracked in DEV-2111.Summary by CodeRabbit
New Features
Documentation