Created
March 18, 2026 18:20
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Flamegraph: PR #91577 hotspot in canary baseline
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| <?xml version="1.0" standalone="no"?> | |
| <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> | |
| <svg version="1.1" width="1000" height="334" onload="init(evt)" viewBox="0 0 1000 334" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"> | |
| <!-- Flame graph stack visualization. See https://github.com/brendangregg/FlameGraph for latest version, and http://www.brendangregg.com/flamegraphs.html for examples. --> | |
| <!-- NOTES: --> | |
| <defs> | |
| <linearGradient id="background" y1="0" y2="1" x1="0" x2="0" > | |
| <stop stop-color="#eeeeee" offset="5%" /> | |
| <stop stop-color="#eeeeb0" offset="95%" /> | |
| </linearGradient> | |
| </defs> | |
| <style type="text/css"> | |
| text { font-family:Verdana; font-size:12px; fill:rgb(0,0,0); } | |
| #search, #ignorecase { opacity:0.1; cursor:pointer; } | |
| #search:hover, #search.show, #ignorecase:hover, #ignorecase.show { opacity:1; } | |
| #subtitle { text-anchor:middle; font-color:rgb(160,160,160); } | |
| #title { text-anchor:middle; font-size:17px} | |
| #unzoom { cursor:pointer; } | |
| #frames > *:hover { stroke:black; stroke-width:0.5; cursor:pointer; } | |
| .hide { display:none; } | |
| .parent { opacity:0.5; } | |
| </style> | |
| <script type="text/ecmascript"> | |
| <![CDATA[ | |
| "use strict"; | |
| var details, searchbtn, unzoombtn, matchedtxt, svg, searching, currentSearchTerm, ignorecase, ignorecaseBtn; | |
| function init(evt) { | |
| details = document.getElementById("details").firstChild; | |
| searchbtn = document.getElementById("search"); | |
| ignorecaseBtn = document.getElementById("ignorecase"); | |
| unzoombtn = document.getElementById("unzoom"); | |
| matchedtxt = document.getElementById("matched"); | |
| svg = document.getElementsByTagName("svg")[0]; | |
| searching = 0; | |
| currentSearchTerm = null; | |
| // use GET parameters to restore a flamegraphs state. | |
| var params = get_params(); | |
| if (params.x && params.y) | |
| zoom(find_group(document.querySelector('[x="' + params.x + '"][y="' + params.y + '"]'))); | |
| if (params.s) search(params.s); | |
| } | |
| // event listeners | |
| window.addEventListener("click", function(e) { | |
| var target = find_group(e.target); | |
| if (target) { | |
| if (target.nodeName == "a") { | |
| if (e.ctrlKey === false) return; | |
| e.preventDefault(); | |
| } | |
| if (target.classList.contains("parent")) unzoom(true); | |
| zoom(target); | |
| if (!document.querySelector('.parent')) { | |
| // we have basically done a clearzoom so clear the url | |
| var params = get_params(); | |
| if (params.x) delete params.x; | |
| if (params.y) delete params.y; | |
| history.replaceState(null, null, parse_params(params)); | |
| unzoombtn.classList.add("hide"); | |
| return; | |
| } | |
| // set parameters for zoom state | |
| var el = target.querySelector("rect"); | |
| if (el && el.attributes && el.attributes.y && el.attributes._orig_x) { | |
| var params = get_params() | |
| params.x = el.attributes._orig_x.value; | |
| params.y = el.attributes.y.value; | |
| history.replaceState(null, null, parse_params(params)); | |
| } | |
| } | |
| else if (e.target.id == "unzoom") clearzoom(); | |
| else if (e.target.id == "search") search_prompt(); | |
| else if (e.target.id == "ignorecase") toggle_ignorecase(); | |
| }, false) | |
| // mouse-over for info | |
| // show | |
| window.addEventListener("mouseover", function(e) { | |
| var target = find_group(e.target); | |
| if (target) details.nodeValue = "Function: " + g_to_text(target); | |
| }, false) | |
| // clear | |
| window.addEventListener("mouseout", function(e) { | |
| var target = find_group(e.target); | |
| if (target) details.nodeValue = ' '; | |
| }, false) | |
| // ctrl-F for search | |
| // ctrl-I to toggle case-sensitive search | |
| window.addEventListener("keydown",function (e) { | |
| if (e.keyCode === 114 || (e.ctrlKey && e.keyCode === 70)) { | |
| e.preventDefault(); | |
| search_prompt(); | |
| } | |
| else if (e.ctrlKey && e.keyCode === 73) { | |
| e.preventDefault(); | |
| toggle_ignorecase(); | |
| } | |
| }, false) | |
| // functions | |
| function get_params() { | |
| var params = {}; | |
| var paramsarr = window.location.search.substr(1).split('&'); | |
| for (var i = 0; i < paramsarr.length; ++i) { | |
| var tmp = paramsarr[i].split("="); | |
| if (!tmp[0] || !tmp[1]) continue; | |
| params[tmp[0]] = decodeURIComponent(tmp[1]); | |
| } | |
| return params; | |
| } | |
| function parse_params(params) { | |
| var uri = "?"; | |
| for (var key in params) { | |
| uri += key + '=' + encodeURIComponent(params[key]) + '&'; | |
| } | |
| if (uri.slice(-1) == "&") | |
| uri = uri.substring(0, uri.length - 1); | |
| if (uri == '?') | |
| uri = window.location.href.split('?')[0]; | |
| return uri; | |
| } | |
| function find_child(node, selector) { | |
| var children = node.querySelectorAll(selector); | |
| if (children.length) return children[0]; | |
| } | |
| function find_group(node) { | |
| var parent = node.parentElement; | |
| if (!parent) return; | |
| if (parent.id == "frames") return node; | |
| return find_group(parent); | |
| } | |
| function orig_save(e, attr, val) { | |
| if (e.attributes["_orig_" + attr] != undefined) return; | |
| if (e.attributes[attr] == undefined) return; | |
| if (val == undefined) val = e.attributes[attr].value; | |
| e.setAttribute("_orig_" + attr, val); | |
| } | |
| function orig_load(e, attr) { | |
| if (e.attributes["_orig_"+attr] == undefined) return; | |
| e.attributes[attr].value = e.attributes["_orig_" + attr].value; | |
| e.removeAttribute("_orig_"+attr); | |
| } | |
| function g_to_text(e) { | |
| var text = find_child(e, "title").firstChild.nodeValue; | |
| return (text) | |
| } | |
| function g_to_func(e) { | |
| var func = g_to_text(e); | |
| // if there's any manipulation we want to do to the function | |
| // name before it's searched, do it here before returning. | |
| return (func); | |
| } | |
| function update_text(e) { | |
| var r = find_child(e, "rect"); | |
| var t = find_child(e, "text"); | |
| var w = parseFloat(r.attributes.width.value) -3; | |
| var txt = find_child(e, "title").textContent.replace(/\([^(]*\)$/,""); | |
| t.attributes.x.value = parseFloat(r.attributes.x.value) + 3; | |
| // Smaller than this size won't fit anything | |
| if (w < 2 * 12 * 0.59) { | |
| t.textContent = ""; | |
| return; | |
| } | |
| t.textContent = txt; | |
| var sl = t.getSubStringLength(0, txt.length); | |
| // check if only whitespace or if we can fit the entire string into width w | |
| if (/^ *$/.test(txt) || sl < w) | |
| return; | |
| // this isn't perfect, but gives a good starting point | |
| // and avoids calling getSubStringLength too often | |
| var start = Math.floor((w/sl) * txt.length); | |
| for (var x = start; x > 0; x = x-2) { | |
| if (t.getSubStringLength(0, x + 2) <= w) { | |
| t.textContent = txt.substring(0, x) + ".."; | |
| return; | |
| } | |
| } | |
| t.textContent = ""; | |
| } | |
| // zoom | |
| function zoom_reset(e) { | |
| if (e.attributes != undefined) { | |
| orig_load(e, "x"); | |
| orig_load(e, "width"); | |
| } | |
| if (e.childNodes == undefined) return; | |
| for (var i = 0, c = e.childNodes; i < c.length; i++) { | |
| zoom_reset(c[i]); | |
| } | |
| } | |
| function zoom_child(e, x, ratio) { | |
| if (e.attributes != undefined) { | |
| if (e.attributes.x != undefined) { | |
| orig_save(e, "x"); | |
| e.attributes.x.value = (parseFloat(e.attributes.x.value) - x - 10) * ratio + 10; | |
| if (e.tagName == "text") | |
| e.attributes.x.value = find_child(e.parentNode, "rect[x]").attributes.x.value + 3; | |
| } | |
| if (e.attributes.width != undefined) { | |
| orig_save(e, "width"); | |
| e.attributes.width.value = parseFloat(e.attributes.width.value) * ratio; | |
| } | |
| } | |
| if (e.childNodes == undefined) return; | |
| for (var i = 0, c = e.childNodes; i < c.length; i++) { | |
| zoom_child(c[i], x - 10, ratio); | |
| } | |
| } | |
| function zoom_parent(e) { | |
| if (e.attributes) { | |
| if (e.attributes.x != undefined) { | |
| orig_save(e, "x"); | |
| e.attributes.x.value = 10; | |
| } | |
| if (e.attributes.width != undefined) { | |
| orig_save(e, "width"); | |
| e.attributes.width.value = parseInt(svg.width.baseVal.value) - (10 * 2); | |
| } | |
| } | |
| if (e.childNodes == undefined) return; | |
| for (var i = 0, c = e.childNodes; i < c.length; i++) { | |
| zoom_parent(c[i]); | |
| } | |
| } | |
| function zoom(node) { | |
| var attr = find_child(node, "rect").attributes; | |
| var width = parseFloat(attr.width.value); | |
| var xmin = parseFloat(attr.x.value); | |
| var xmax = parseFloat(xmin + width); | |
| var ymin = parseFloat(attr.y.value); | |
| var ratio = (svg.width.baseVal.value - 2 * 10) / width; | |
| // XXX: Workaround for JavaScript float issues (fix me) | |
| var fudge = 0.0001; | |
| unzoombtn.classList.remove("hide"); | |
| var el = document.getElementById("frames").children; | |
| for (var i = 0; i < el.length; i++) { | |
| var e = el[i]; | |
| var a = find_child(e, "rect").attributes; | |
| var ex = parseFloat(a.x.value); | |
| var ew = parseFloat(a.width.value); | |
| var upstack; | |
| // Is it an ancestor | |
| if (0 == 0) { | |
| upstack = parseFloat(a.y.value) > ymin; | |
| } else { | |
| upstack = parseFloat(a.y.value) < ymin; | |
| } | |
| if (upstack) { | |
| // Direct ancestor | |
| if (ex <= xmin && (ex+ew+fudge) >= xmax) { | |
| e.classList.add("parent"); | |
| zoom_parent(e); | |
| update_text(e); | |
| } | |
| // not in current path | |
| else | |
| e.classList.add("hide"); | |
| } | |
| // Children maybe | |
| else { | |
| // no common path | |
| if (ex < xmin || ex + fudge >= xmax) { | |
| e.classList.add("hide"); | |
| } | |
| else { | |
| zoom_child(e, xmin, ratio); | |
| update_text(e); | |
| } | |
| } | |
| } | |
| search(); | |
| } | |
| function unzoom(dont_update_text) { | |
| unzoombtn.classList.add("hide"); | |
| var el = document.getElementById("frames").children; | |
| for(var i = 0; i < el.length; i++) { | |
| el[i].classList.remove("parent"); | |
| el[i].classList.remove("hide"); | |
| zoom_reset(el[i]); | |
| if(!dont_update_text) update_text(el[i]); | |
| } | |
| search(); | |
| } | |
| function clearzoom() { | |
| unzoom(); | |
| // remove zoom state | |
| var params = get_params(); | |
| if (params.x) delete params.x; | |
| if (params.y) delete params.y; | |
| history.replaceState(null, null, parse_params(params)); | |
| } | |
| // search | |
| function toggle_ignorecase() { | |
| ignorecase = !ignorecase; | |
| if (ignorecase) { | |
| ignorecaseBtn.classList.add("show"); | |
| } else { | |
| ignorecaseBtn.classList.remove("show"); | |
| } | |
| reset_search(); | |
| search(); | |
| } | |
| function reset_search() { | |
| var el = document.querySelectorAll("#frames rect"); | |
| for (var i = 0; i < el.length; i++) { | |
| orig_load(el[i], "fill") | |
| } | |
| var params = get_params(); | |
| delete params.s; | |
| history.replaceState(null, null, parse_params(params)); | |
| } | |
| function search_prompt() { | |
| if (!searching) { | |
| var term = prompt("Enter a search term (regexp " + | |
| "allowed, eg: ^ext4_)" | |
| + (ignorecase ? ", ignoring case" : "") | |
| + "\nPress Ctrl-i to toggle case sensitivity", ""); | |
| if (term != null) search(term); | |
| } else { | |
| reset_search(); | |
| searching = 0; | |
| currentSearchTerm = null; | |
| searchbtn.classList.remove("show"); | |
| searchbtn.firstChild.nodeValue = "Search" | |
| matchedtxt.classList.add("hide"); | |
| matchedtxt.firstChild.nodeValue = "" | |
| } | |
| } | |
| function search(term) { | |
| if (term) currentSearchTerm = term; | |
| if (currentSearchTerm === null) return; | |
| var re = new RegExp(currentSearchTerm, ignorecase ? 'i' : ''); | |
| var el = document.getElementById("frames").children; | |
| var matches = new Object(); | |
| var maxwidth = 0; | |
| for (var i = 0; i < el.length; i++) { | |
| var e = el[i]; | |
| var func = g_to_func(e); | |
| var rect = find_child(e, "rect"); | |
| if (func == null || rect == null) | |
| continue; | |
| // Save max width. Only works as we have a root frame | |
| var w = parseFloat(rect.attributes.width.value); | |
| if (w > maxwidth) | |
| maxwidth = w; | |
| if (func.match(re)) { | |
| // highlight | |
| var x = parseFloat(rect.attributes.x.value); | |
| orig_save(rect, "fill"); | |
| rect.attributes.fill.value = "rgb(230,0,230)"; | |
| // remember matches | |
| if (matches[x] == undefined) { | |
| matches[x] = w; | |
| } else { | |
| if (w > matches[x]) { | |
| // overwrite with parent | |
| matches[x] = w; | |
| } | |
| } | |
| searching = 1; | |
| } | |
| } | |
| if (!searching) | |
| return; | |
| var params = get_params(); | |
| params.s = currentSearchTerm; | |
| history.replaceState(null, null, parse_params(params)); | |
| searchbtn.classList.add("show"); | |
| searchbtn.firstChild.nodeValue = "Reset Search"; | |
| // calculate percent matched, excluding vertical overlap | |
| var count = 0; | |
| var lastx = -1; | |
| var lastw = 0; | |
| var keys = Array(); | |
| for (k in matches) { | |
| if (matches.hasOwnProperty(k)) | |
| keys.push(k); | |
| } | |
| // sort the matched frames by their x location | |
| // ascending, then width descending | |
| keys.sort(function(a, b){ | |
| return a - b; | |
| }); | |
| // Step through frames saving only the biggest bottom-up frames | |
| // thanks to the sort order. This relies on the tree property | |
| // where children are always smaller than their parents. | |
| var fudge = 0.0001; // JavaScript floating point | |
| for (var k in keys) { | |
| var x = parseFloat(keys[k]); | |
| var w = matches[keys[k]]; | |
| if (x >= lastx + lastw - fudge) { | |
| count += w; | |
| lastx = x; | |
| lastw = w; | |
| } | |
| } | |
| // display matched percent | |
| matchedtxt.classList.remove("hide"); | |
| var pct = 100 * count / maxwidth; | |
| if (pct != 100) pct = pct.toFixed(1) | |
| matchedtxt.firstChild.nodeValue = "Matched: " + pct + "%"; | |
| } | |
| ]]> | |
| </script> | |
| <rect x="0.0" y="0" width="1000.0" height="334.0" fill="url(#background)" /> | |
| <text id="title" x="500.00" y="24" >PR #91577: structuredClone in metadata resolution (ELIMINATED)</text> | |
| <text id="subtitle" x="500.00" y="48" >CPU time in canary baseline attributed to this hotspot</text> | |
| <text id="details" x="10.00" y="317" > </text> | |
| <text id="unzoom" x="10.00" y="24" class="hide">Reset Zoom</text> | |
| <text id="search" x="890.00" y="24" >Search</text> | |
| <text id="ignorecase" x="974.00" y="24" >ic</text> | |
| <text id="matched" x="890.00" y="317" > </text> | |
| <g id="frames"> | |
| <g > | |
| <title>render (78 μs, 31.33%)</title><rect x="10.0" y="125" width="307.0" height="15.0" fill="rgb(229,111,26)" rx="2" ry="2" /> | |
| <text x="13.00" y="135.5" >render</text> | |
| </g> | |
| <g > | |
| <title>handleRewrites (67 μs, 26.91%)</title><rect x="726.3" y="205" width="263.7" height="15.0" fill="rgb(248,198,47)" rx="2" ry="2" /> | |
| <text x="729.31" y="215.5" >handleRewrites</text> | |
| </g> | |
| <g > | |
| <title>processTicksAndRejections (249 μs, 100.00%)</title><rect x="10.0" y="253" width="980.0" height="15.0" fill="rgb(230,118,28)" rx="2" ry="2" /> | |
| <text x="13.00" y="263.5" >processTicksAndRejections</text> | |
| </g> | |
| <g > | |
| <title>prepare (171 μs, 68.67%)</title><rect x="317.0" y="221" width="673.0" height="15.0" fill="rgb(212,32,7)" rx="2" ry="2" /> | |
| <text x="319.99" y="231.5" >prepare</text> | |
| </g> | |
| <g > | |
| <title>structuredClone (78 μs, 31.33%)</title><rect x="10.0" y="77" width="307.0" height="15.0" fill="rgb(238,156,37)" rx="2" ry="2" /> | |
| <text x="13.00" y="87.5" >structuredClone</text> | |
| </g> | |
| <g > | |
| <title>handleResponse (78 μs, 31.33%)</title><rect x="10.0" y="221" width="307.0" height="15.0" fill="rgb(236,146,35)" rx="2" ry="2" /> | |
| <text x="13.00" y="231.5" >handleResponse</text> | |
| </g> | |
| <g > | |
| <title>m (78 μs, 31.33%)</title><rect x="10.0" y="157" width="307.0" height="15.0" fill="rgb(209,20,4)" rx="2" ry="2" /> | |
| <text x="13.00" y="167.5" >m</text> | |
| </g> | |
| <g > | |
| <title>d.prefixRouteKeys (104 μs, 41.77%)</title><rect x="317.0" y="189" width="409.3" height="15.0" fill="rgb(229,114,27)" rx="2" ry="2" /> | |
| <text x="319.99" y="199.5" >d.prefixRouteKeys</text> | |
| </g> | |
| <g > | |
| <title>structuredClone (104 μs, 41.77%)</title><rect x="317.0" y="173" width="409.3" height="15.0" fill="rgb(238,156,37)" rx="2" ry="2" /> | |
| <text x="319.99" y="183.5" >structuredClone</text> | |
| </g> | |
| <g > | |
| <title>responseGenerator (78 μs, 31.33%)</title><rect x="10.0" y="189" width="307.0" height="15.0" fill="rgb(245,185,44)" rx="2" ry="2" /> | |
| <text x="13.00" y="199.5" >responseGenerator</text> | |
| </g> | |
| <g > | |
| <title>i (78 μs, 31.33%)</title><rect x="10.0" y="141" width="307.0" height="15.0" fill="rgb(235,139,33)" rx="2" ry="2" /> | |
| <text x="13.00" y="151.5" >i</text> | |
| </g> | |
| <g > | |
| <title>structuredClone (8 μs, 3.21%)</title><rect x="958.5" y="173" width="31.5" height="15.0" fill="rgb(238,156,37)" rx="2" ry="2" /> | |
| <text x="961.51" y="183.5" >st..</text> | |
| </g> | |
| <g > | |
| <title>runMicrotasks (249 μs, 100.00%)</title><rect x="10.0" y="237" width="980.0" height="15.0" fill="rgb(239,156,37)" rx="2" ry="2" /> | |
| <text x="13.00" y="247.5" >runMicrotasks</text> | |
| </g> | |
| <g > | |
| <title>get (78 μs, 31.33%)</title><rect x="10.0" y="205" width="307.0" height="15.0" fill="rgb(246,190,45)" rx="2" ry="2" /> | |
| <text x="13.00" y="215.5" >get</text> | |
| </g> | |
| <g > | |
| <title>structuredClone (26 μs, 10.44%)</title><rect x="214.7" y="61" width="102.3" height="15.0" fill="rgb(238,156,37)" rx="2" ry="2" /> | |
| <text x="217.66" y="71.5" >structuredCl..</text> | |
| </g> | |
| <g > | |
| <title>(root) (249 μs, 100.00%)</title><rect x="10.0" y="269" width="980.0" height="15.0" fill="rgb(220,70,16)" rx="2" ry="2" /> | |
| <text x="13.00" y="279.5" >(root)</text> | |
| </g> | |
| <g > | |
| <title>structuredClone (67 μs, 26.91%)</title><rect x="726.3" y="189" width="263.7" height="15.0" fill="rgb(238,156,37)" rx="2" ry="2" /> | |
| <text x="729.31" y="199.5" >structuredClone</text> | |
| </g> | |
| <g > | |
| <title>structuredClone (21 μs, 8.43%)</title><rect x="643.7" y="157" width="82.6" height="15.0" fill="rgb(238,156,37)" rx="2" ry="2" /> | |
| <text x="646.65" y="167.5" >structure..</text> | |
| </g> | |
| <g > | |
| <title>A.page (104 μs, 41.77%)</title><rect x="317.0" y="205" width="409.3" height="15.0" fill="rgb(228,108,25)" rx="2" ry="2" /> | |
| <text x="319.99" y="215.5" >A.page</text> | |
| </g> | |
| <g > | |
| <title>lC (78 μs, 31.33%)</title><rect x="10.0" y="109" width="307.0" height="15.0" fill="rgb(233,129,30)" rx="2" ry="2" /> | |
| <text x="13.00" y="119.5" >lC</text> | |
| </g> | |
| <g > | |
| <title>nx (78 μs, 31.33%)</title><rect x="10.0" y="93" width="307.0" height="15.0" fill="rgb(227,104,25)" rx="2" ry="2" /> | |
| <text x="13.00" y="103.5" >nx</text> | |
| </g> | |
| <g > | |
| <title>n (78 μs, 31.33%)</title><rect x="10.0" y="173" width="307.0" height="15.0" fill="rgb(252,220,52)" rx="2" ry="2" /> | |
| <text x="13.00" y="183.5" >n</text> | |
| </g> | |
| <g > | |
| <title>all (249 μs, 100%)</title><rect x="10.0" y="285" width="980.0" height="15.0" fill="rgb(213,39,9)" rx="2" ry="2" /> | |
| <text x="13.00" y="295.5" ></text> | |
| </g> | |
| </g> | |
| </svg> |
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