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rename-family (rename/renameat/renameat2) and link-family (link/linkat/
symlink/symlinkat) capture BOTH paths in BPF (name_event.oldname at
args[1] for the AT-variants, after a dirfd, plus newname), but only
newname reached any persisted output. event.Pair.FileName() resolves to
oldnameNewnameFile.Name() == Newname, so the parquet `file` column, CSV,
and flamegraph Path all carried newname; the captured oldname survived
only in the TUI stream String() repr ("old:... ->new:..."). The oldname
capture (and its args[1] index for the AT-variants) was therefore never
validated end-to-end, and a wrong-oldname-index regression would surface
in no persisted output or test.
Surface oldname as one additive, backward-compatible column, mirroring
the dedicated optional-column convention (address_space_bytes,
requested_sleep_ns, epoll_*):
- old_file (String): source/old path for rename/link syscalls; empty for
every other syscall. The existing `file` column keeps its semantics
(newname for rename/link).
Data flows name_event.oldname -> event.Pair.Oldname (populated in
handleNameExit alongside the existing File) -> streamrow.Row.OldName ->
parquet.Record.OldFile. Docs (docs/parquet-querying.md) and the Magefile
parquetValidate column list updated in lockstep.
The new TestRenameRenameatOldnameInParquet integration test exercises the
renameat AT-variant (oldname at args[1] after the olddfd dirfd) and
asserts the parquet old_file column carries renameat-old.txt while file
carries renameat-new.txt, and that old_file stays empty for non-rename/
link rows -- locking in the args[1] oldname capture end-to-end.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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epoll_ctl's BPF handler already decodes the operation (args[1]),
target descriptor (args[2]), and requested event mask (args[3]->events)
into an EpollCtlEvent, but the single resolved-epfd `fd` column was the
only epoll detail reaching the output schema. Consumers could not see
which descriptor was registered nor the operation performed.
Surface the metadata as three additive, backward-compatible columns,
mirroring the existing dedicated optional-column convention used by
requested_sleep_ns and address_space_bytes:
- epoll_op (String): ADD/MOD/DEL, or the raw decimal for unknown ops;
empty for non-epoll_ctl rows.
- epoll_target_fd (Int32): registered descriptor (args[2]); 0 otherwise.
- epoll_events (UInt32): requested event mask; 0 otherwise.
Data flows EpollCtlEvent -> event.Pair (new EpollCtl/HasEpoll fields,
populated in handleEpollCtlExit) -> streamrow.Row -> parquet.Record.
The op-to-string mapping lives on event.EpollCtl.OpName.
Docs (docs/parquet-querying.md) and the Magefile parquetValidate column
list updated in lockstep (also adding the previously-undocumented
address_space_bytes/requested_sleep_ns columns). The polling parquet
integration test now asserts epoll_ctl rows carry a decoded op and a
valid target fd, and that other syscalls leave epoll_op empty.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Extend the var _ Interface = (*Concrete)(nil) coverage started in j3 to
cover the remaining public types not yet guarded:
- *file.FdFile → file.File (file/file.go)
- streamrow.Row → globalfilter.Candidate (streamrow/row.go; adds
globalfilter import — no cycle since globalfilter does not import streamrow)
- *streamrow.RingBuffer → eventstream.Source
(tui/eventstream/ringbuffer.go; already a type alias for streamrow.RingBuffer)
- *probemanager.Manager → tui/probes.Manager (tui/probes/model.go)
- All 9 generated *types.*Event types → event.Event in the new file
internal/event/interface_assertions.go (non-generated, lives in the event
package which already imports types, so no new import cycle)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Extract GetTraceId/GetPid/GetTid into EventIdentity (routing and
aggregation concerns) and Recycle into EventLifecycle (pool memory
management). Event embeds both and retains String, GetTime, Equals.
All existing implementations satisfy the composed interface unchanged.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Run gofmt -w on 9 files that had minor alignment/whitespace drift
(pair.go, filter.go, ior_mode_registry.go, ior_mode_test.go,
runtime.go, engine.go, dashboard/model.go, flamegraph/model.go,
flamegraph/renderer.go).
Add two new Mage targets to Magefile.go:
- `mage fmt` – rewrites all .go files in-place via go/format
- `mage fmtCheck` – dry-run check; fails with a list of offending
files, suitable as a CI gate
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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BPF timestamps can be non-monotonic across CPUs (NTP step, TSC skew).
When exit < enter or enter < prevPairTime the uint64 subtraction wraps
to a huge value, corrupting latency histograms and flamegraph weights.
Clamp both Duration and DurationToPrev to 0 instead of underflowing.
Add TestPairCalculateDurationsNegativeDelta to cover this case.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Amp-Thread-ID: https://ampcode.com/threads/T-019c8012-eaeb-768d-a264-5a704f3939ef
Co-authored-by: Amp <amp@ampcode.com>
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- Implement helper function makeEnterFcntlEvent for test data creation
- Add test for F_SETFL flag modification (temporarily disabled due to failure)
- Add test for F_DUPFD file descriptor duplication
- Add test for F_DUPFD_CLOEXEC with O_CLOEXEC flag
- Add test for fcntl error handling (ret=-1)
- Add test for invalid file descriptors
Bug fixes:
- Fix NewFdWithPid to properly initialize fd field
- Fix event pair pool to properly clear all fields on recycle
- Initialize all fields in NewPair to prevent stale data
The F_SETFL test is temporarily disabled pending investigation of
"expected a file.FdFile" panic during event processing.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
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