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Bug 1306249 - Report phase with longest self time, not longest total time, r=jonco

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--HG--
extra : rebase_source : 54eb82d2849cf93d8a85e9e575d72ba26321cd93
This commit is contained in:
Steve Fink 2016-09-30 12:25:21 -07:00
parent 3360de184b
commit 2fbae55abc
1 changed files with 30 additions and 5 deletions
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35
js/src/gc/Statistics.cpp
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@ -917,17 +917,42 @@ SumPhase(Phase phase, const Statistics::PhaseTimeTable times)
}
static Phase
LongestPhase(const Statistics::PhaseTimeTable times)
LongestPhaseSelfTime(const Statistics::PhaseTimeTable times)
{
int64_t selfTimes[PHASE_LIMIT];
// Start with total times, including children's times.
for (size_t i = 0; i < PHASE_LIMIT; ++i)
selfTimes[i] = SumPhase(Phase(i), times);
// Subtract out the children's times.
for (size_t i = 0; i < PHASE_LIMIT; ++i) {
Phase parent = phases[i].parent;
if (parent == PHASE_MULTI_PARENTS) {
// Subtract out only the time for the children specific to this
// parent.
for (auto edge : dagChildEdges) {
if (edge.parent == parent) {
size_t dagSlot = phaseExtra[edge.parent].dagSlot;
MOZ_ASSERT(selfTimes[parent] >= times[dagSlot][edge.child]);
selfTimes[parent] -= times[dagSlot][edge.child];
}
}
} else if (parent != PHASE_NO_PARENT) {
MOZ_ASSERT(selfTimes[parent] >= selfTimes[i]);
selfTimes[parent] -= selfTimes[i];
}
}
int64_t longestTime = 0;
Phase longestPhase = PHASE_NONE;
for (size_t i = 0; i < PHASE_LIMIT; ++i) {
int64_t phaseTime = SumPhase(Phase(i), times);
if (phaseTime > longestTime) {
longestTime = phaseTime;
if (selfTimes[i] > longestTime) {
longestTime = selfTimes[i];
longestPhase = Phase(i);
}
}
return longestPhase;
}
@ -1078,7 +1103,7 @@ Statistics::endSlice()
// Record any phase that goes more than 2x over its budget.
if (sliceTime > 2 * budget_ms * 1000) {
Phase longest = LongestPhase(slices.back().phaseTimes);
Phase longest = LongestPhaseSelfTime(slices.back().phaseTimes);
runtime->addTelemetry(JS_TELEMETRY_GC_SLOW_PHASE, phases[longest].telemetryBucket);
}
}