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Bug 968237 - Use a pref to set the threshold of the event loop lag tracker. r=ted

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This commit is contained in:
Vivien Nicolas 2014-02-15 01:45:45 +01:00
parent dc571e356c
commit b3b9d997a5
1 changed files with 10 additions and 2 deletions
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12
toolkit/xre/EventTracer.cpp
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@ -55,6 +55,7 @@
#include <stdio.h>
#include "mozilla/Preferences.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/WidgetTraceEvent.h"
#include "nsDebug.h"
@ -81,6 +82,7 @@ bool sExit = false;
struct TracerStartClosure {
bool mLogTracing;
int32_t mThresholdInterval;
};
#ifdef MOZ_WIDGET_GONK
@ -127,9 +129,10 @@ void TracerThread(void *arg)
// These are the defaults. They can be overridden by environment vars.
// This should be set to the maximum latency we'd like to allow
// for responsiveness.
PRIntervalTime threshold = PR_MillisecondsToInterval(20);
int32_t thresholdInterval = threadArgs->mThresholdInterval;
PRIntervalTime threshold = PR_MillisecondsToInterval(thresholdInterval);
// This is the sampling interval.
PRIntervalTime interval = PR_MillisecondsToInterval(10);
PRIntervalTime interval = PR_MillisecondsToInterval(thresholdInterval / 2);
sExit = false;
FILE* log = nullptr;
@ -226,6 +229,11 @@ bool InitEventTracing(bool aLog)
TracerStartClosure* args = new TracerStartClosure();
args->mLogTracing = aLog;
// Pass the default threshold interval.
int32_t thresholdInterval = 20;
Preferences::GetInt("devtools.eventlooplag.threshold", &thresholdInterval);
args->mThresholdInterval = thresholdInterval;
// Create a thread that will fire events back at the
// main thread to measure responsiveness.
NS_ABORT_IF_FALSE(!sTracerThread, "Event tracing already initialized!");