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orca/docs
Neil 53f105827b perf(windows): stop asking the process table for memory, and share one projection per snapshot (#18151)
Two costs on the Windows process-table hot path, plus the EDR doc that
described neither of them accurately.

1. The snapshot set `ProcessDataFlag.Memory` and surfaced `memoryBytes`,
   which nothing read. The addon serves that flag with a second
   `OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ)` and a
   `GetProcessMemoryInfo` per process (process.cc:47-63), so the flag was
   one wasted handle per process per snapshot.

2. The shared TTL cache gave every pane the same native rows array, but
   each pane still ran `native.map(toProcessRow)` over the whole table,
   rebuilt a `childrenByPpid` Map from scratch, and did two linear scans.
   The `.map()` also handed `getProcessTableIndex` a new array each call,
   defeating the POSIX memo by construction. Both now cache per snapshot
   identity, and the POSIX resolver drops its duplicate descendant walk.

`getProcessTableIndex` / `buildProcessTableIndex` are generic over the row
shape so the Windows rows reuse the existing pass instead of a parallel one.

No behavior change: same rows in, same rows out, same descendant ordering
and same has-children answers.
2026-09-02 13:08:01 -07:00
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2026-08-28 00:59:21 -07:00