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Stack GCs on top of the previous stack

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This commit is contained in:
Jamie Wong 2018-01-08 22:38:01 -08:00
parent 0c9878f3de
commit 8d5b924d1d
1 changed files with 23 additions and 2 deletions
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25
import/chrome.ts
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@ -87,15 +87,36 @@ export function importFromChromeCPUProfile(chromeProfile: CPUProfile) {
timeDeltas.push(elapsed)
}
let lastNonGCStackTop: CPUProfileNode | null = null
for (let i = 0; i < samples.length; i++) {
const timeDelta = timeDeltas[i+1] || 0
const nodeId = samples[i]
let node = nodeById.get(nodeId)
if (!node) continue
// TODO(jlfwong): This is silly and slow, but good enough for now
const stack: FrameInfo[] = []
for (let node = nodeById.get(nodeId); node; node = node.parent) {
if (node.callFrame.functionName === "(garbage collector)") {
// Place GC calls on top of the previous call stack
stack.push({
key: node.callFrame.functionName,
name: node.callFrame.functionName,
file: node.callFrame.url,
line: node.callFrame.lineNumber,
col: node.callFrame.columnNumber
})
if (!lastNonGCStackTop) {
profile.appendSample(stack, timeDelta)
continue
} else {
node = lastNonGCStackTop
}
}
lastNonGCStackTop = node
// TODO(jlfwong): This is silly and slow, but good enough for now
for (; node; node = node.parent) {
if (node.callFrame.functionName === '(root)') continue
if (node.callFrame.functionName === '(idle)') continue