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Load the Changes diff quickly while the daemon reconciles worktrees (#9243)

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* fix(server): keep cold diffs out from behind background git fan-out

Add a background lane to the git process scheduler and run reconciliation
checkout reads, observation-driven workspace refreshes and background fetches
in it. Bound reconciliation checkout reads to four at a time. Stop the Linux
file observer's startup scan from reporting existing files as creates, which
made every cold diff compute and discard its first revision.

* fix(server): pick the git job when its start token fires

Background jobs that already reserved a start-rate token no longer start
ahead of normal work submitted after them.

* fix(server): re-read the working tree once its watcher covers it

The Linux observer no longer reports pre-existing files at startup, so an
edit made between a workspace's first snapshot and its watcher subscribing
reached no consumer. WorkspaceGit now runs one background working-tree read
once observation setup completes with a live watcher.

Demand refreshes keep the caller's Git lane instead of forcing normal, so
user actions running at high priority are not demoted.

Scope the populated-tree observer test to Linux (FSEvents replays recent
writes) and update the observer benchmark test, which expected the removed
startup batch.

* fix(server): re-read checkout metadata once observation covers it

A branch switch made before the Git metadata watcher subscribed left the
cached branch stale. The post-coverage read now refreshes structure as well
as the working tree, matching the refresh the Linux startup events used to
trigger.
This commit is contained in:
Mohamed Boudra
2026-11-10 10:21:13 +07:00
committed by GitHub
parent 2e1747a145
commit 48a1497fc0
16 changed files with 641 additions and 96 deletions
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packages/server/scripts/measure-file-observer.test.ts
+4 -4
View File
@@ -8,10 +8,10 @@ import { expect, test } from "vitest";
const execFileAsync = promisify(execFile);
// Linux delivers the existing inventory as one batch. Other backends have
// different startup semantics, so they do not exercise this regression.
// The Linux backend scans the existing inventory at startup without reporting
// it. Other backends have different startup semantics.
test.skipIf(process.platform !== "linux").each(["healthy", "directory-churn"])(
"%s benchmark collects a startup batch larger than the argument limit",
"%s benchmark over a large pre-populated tree reports only later edits",
async (mode) => {
const temporaryRoot = await mkdtemp(join(tmpdir(), "paseo-watch-benchmark-test-"));
try {
@@ -47,7 +47,7 @@ test.skipIf(process.platform !== "linux").each(["healthy", "directory-churn"])(
},
);
const measurement = JSON.parse(stdout);
expect(measurement.startupEvents).toBe(40_000);
expect(measurement.startupEvents).toBe(0);
expect(measurement.deliveredEvents).toBeGreaterThan(measurement.startupEvents);
expect(measurement.missedTrackedPaths).toBe(0);
expect(measurement.ignoredEvents).toBe(0);