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perf(observation): reduce document processing scheduling overhead

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This commit is contained in:
Ljy-0827
2026-09-09 15:54:41 +08:00
committed by drakezhang
parent 388b3ae2d5
commit 1d275f047c
6 changed files with 100 additions and 38 deletions
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apps/extension/src/tools/vom/facts.ts
+18 -5
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@@ -1,5 +1,5 @@
import { isOverlayHostNode } from "@/lib/overlay-bridge";
import { captureCheckpoint } from "./capture-abort";
import { createCaptureCheckpoint } from "./capture-abort";
import type { CapturedNode } from "./capture-types";
/** Bounds retain their snapshot document CSS units until normalization. */
@@ -34,24 +34,34 @@ export async function buildDocumentIndex<T extends DecodedNode>(
input: readonly T[],
signal?: AbortSignal,
): Promise<DocumentIndex<T>> {
const checkpoint = createCaptureCheckpoint(signal);
const nodes = new Map<number, T>();
const overlayByNode = new Map<number, boolean>();
const excludedBackendNodeIds = new Set<number>();
for (let i = 0; i < input.length; i++) {
if (i % 256 === 0) await captureCheckpoint(signal);
if (i % 256 === 0) {
const pending = checkpoint();
if (pending) await pending;
}
const node = input[i];
nodes.set(node.backendNodeId, node);
}
let work = 0;
for (const node of input) {
if (work++ % 256 === 0) await captureCheckpoint(signal);
if (work++ % 256 === 0) {
const pending = checkpoint();
if (pending) await pending;
}
if (overlayByNode.has(node.backendNodeId)) continue;
const path: DecodedNode[] = [];
const visiting = new Set<number>();
let current: DecodedNode | undefined = node;
let overlay = false;
while (current && !overlayByNode.has(current.backendNodeId)) {
if (work++ % 256 === 0) await captureCheckpoint(signal);
if (work++ % 256 === 0) {
const pending = checkpoint();
if (pending) await pending;
}
if (visiting.has(current.backendNodeId)) {
// Only an overlay inside the cycle may mark the cycle and its descendants.
overlay = path
@@ -70,7 +80,10 @@ export async function buildDocumentIndex<T extends DecodedNode>(
if (current && overlayByNode.has(current.backendNodeId))
overlay = overlayByNode.get(current.backendNodeId)!;
for (let i = path.length - 1; i >= 0; i--) {
if (work++ % 256 === 0) await captureCheckpoint(signal);
if (work++ % 256 === 0) {
const pending = checkpoint();
if (pending) await pending;
}
const item = path[i];
overlay = overlay || isOverlayHostNode(item.tag, Object.keys(item.attrs));
overlayByNode.set(item.backendNodeId, overlay);