1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 // You should run this with v8, like v8_shell alloc.js datafile.json 6 7 function toHex(num) { 8 var str = ""; 9 var table = "0123456789abcdef"; 10 while (num != 0) { 11 str = table.charAt(num & 0xf) + str; 12 num >>= 4; 13 } 14 return str; 15 } 16 17 function parseEvents(z) { 18 var crits = { } 19 var calls = { } 20 21 for (var i = 0, il = z.length; i < il; ++i) { 22 var e = z[i]; 23 24 if (e['eventtype'] == 'EVENT_TYPE_ENTER_CS' || 25 e['eventtype'] == 'EVENT_TYPE_TRYENTER_CS' || 26 e['eventtype'] == 'EVENT_TYPE_LEAVE_CS') { 27 cs = e['critical_section']; 28 if (!(cs in crits)) { 29 crits[cs] = [ ]; 30 } 31 crits[cs].push(e); 32 } 33 } 34 35 // Verify that the locks get unlocked, and operations stay on the same thread. 36 for (var key in crits) { 37 var cs = key; 38 var es = crits[key]; 39 40 var tid_stack = [ ]; 41 for (var j = 0, jl = es.length; j < jl; ++j) { 42 var e = es[j]; 43 if (e['eventtype'] == 'EVENT_TYPE_ENTER_CS') { 44 tid_stack.push(e); 45 } else if (e['eventtype'] == 'EVENT_TYPE_TRYENTER_CS') { 46 if (e['retval'] != 0) 47 tid_stack.push(e); 48 } else if (e['eventtype'] == 'EVENT_TYPE_LEAVE_CS') { 49 if (tid_stack.length == 0) { 50 print('fail ' + e); 51 } 52 var tid = tid_stack.pop() 53 if (tid['thread'] != e['thread']) { 54 print('fail ' + tid); 55 } 56 } 57 } 58 } 59 60 // Look for long-held / contended locks. We can't really know it is 61 // contended without looking if anyone is waiting on the embedded event... 62 // Just look for locks are are held a long time? Not so good... 63 for (var key in crits) { 64 var cs = key; 65 var es = crits[key]; 66 67 var tid_stack = [ ]; 68 for (var j = 0, jl = es.length; j < jl; ++j) { 69 var e = es[j]; 70 if (e['eventtype'] == 'EVENT_TYPE_ENTER_CS') { 71 tid_stack.push(e); 72 } else if (e['eventtype'] == 'EVENT_TYPE_TRYENTER_CS') { 73 if (e['retval'] != 0) 74 tid_stack.push(e); 75 } else if (e['eventtype'] == 'EVENT_TYPE_LEAVE_CS') { 76 if (tid_stack.length == 0) { 77 print('fail ' + e); 78 } 79 var tid = tid_stack.pop(); 80 var dur = e['ms'] - tid['ms']; 81 if (dur > 0.1) { 82 print('Lock: 0x' + toHex(cs) + ' for ' + dur + ' at: ' + e['ms']); 83 } 84 } 85 } 86 } 87 } 88
