gecko-dev/toolkit/components/telemetry/Telemetry.h
Aaron Klotz 2dd8e3a0bb Bug 976000: Add info to Telemetry.fileIOReports to differentiate between start/normal/shutdown I/O; r=froydnj
--HG--
extra : rebase_source : 3762a056a06e782648c27cd469ee5f639d500e22
2014-03-18 16:07:35 -06:00

230 lines
6.0 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef Telemetry_h__
#define Telemetry_h__
#include "mozilla/GuardObjects.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/StartupTimeline.h"
#include "nsTArray.h"
#include "nsStringGlue.h"
namespace base {
class Histogram;
}
namespace mozilla {
namespace Telemetry {
#include "TelemetryHistogramEnums.h"
enum TimerResolution {
Millisecond,
Microsecond
};
/**
* Initialize the Telemetry service on the main thread at startup.
*/
void Init();
/**
* Adds sample to a histogram defined in TelemetryHistograms.h
*
* @param id - histogram id
* @param sample - value to record.
*/
void Accumulate(ID id, uint32_t sample);
/**
* Adds a sample to a histogram defined in TelemetryHistograms.h.
* This function is here to support telemetry measurements from Java,
* where we have only names and not numeric IDs. You should almost
* certainly be using the by-enum-id version instead of this one.
*
* @param name - histogram name
* @param sample - value to record
*/
void Accumulate(const char* name, uint32_t sample);
/**
* Adds time delta in milliseconds to a histogram defined in TelemetryHistograms.h
*
* @param id - histogram id
* @param start - start time
* @param end - end time
*/
void AccumulateTimeDelta(ID id, TimeStamp start, TimeStamp end = TimeStamp::Now());
/**
* Return a raw Histogram for direct manipulation for users who can not use Accumulate().
*/
base::Histogram* GetHistogramById(ID id);
/**
* Those wrappers are needed because the VS versions we use do not support free
* functions with default template arguments.
*/
template<TimerResolution res>
struct AccumulateDelta_impl
{
static void compute(ID id, TimeStamp start, TimeStamp end = TimeStamp::Now());
};
template<>
struct AccumulateDelta_impl<Millisecond>
{
static void compute(ID id, TimeStamp start, TimeStamp end = TimeStamp::Now()) {
Accumulate(id, static_cast<uint32_t>((end - start).ToMilliseconds()));
}
};
template<>
struct AccumulateDelta_impl<Microsecond>
{
static void compute(ID id, TimeStamp start, TimeStamp end = TimeStamp::Now()) {
Accumulate(id, static_cast<uint32_t>((end - start).ToMicroseconds()));
}
};
template<ID id, TimerResolution res = Millisecond>
class AutoTimer {
public:
AutoTimer(TimeStamp aStart = TimeStamp::Now() MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: start(aStart)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
~AutoTimer() {
AccumulateDelta_impl<res>::compute(id, start);
}
private:
const TimeStamp start;
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
template<ID id>
class AutoCounter {
public:
AutoCounter(uint32_t counterStart = 0 MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: counter(counterStart)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
~AutoCounter() {
Accumulate(id, counter);
}
// Prefix increment only, to encourage good habits.
void operator++() {
++counter;
}
// Chaining doesn't make any sense, don't return anything.
void operator+=(int increment) {
counter += increment;
}
private:
uint32_t counter;
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
/**
* Indicates whether Telemetry recording is turned on. This is intended
* to guard calls to Accumulate when the statistic being recorded is
* expensive to compute.
*/
bool CanRecord();
/**
* Records slow SQL statements for Telemetry reporting.
*
* @param statement - offending SQL statement to record
* @param dbName - DB filename
* @param delay - execution time in milliseconds
*/
void RecordSlowSQLStatement(const nsACString &statement,
const nsACString &dbName,
uint32_t delay);
/**
* Initialize I/O Reporting
* Initially this only records I/O for files in the binary directory.
*
* @param aXreDir - XRE directory
*/
void InitIOReporting(nsIFile* aXreDir);
/**
* Set the profile directory. Once called, files in the profile directory will
* be included in I/O reporting. We can't use the directory
* service to obtain this information because it isn't running yet.
*/
void SetProfileDir(nsIFile* aProfD);
/**
* Called to inform Telemetry that startup has completed.
*/
void LeavingStartupStage();
/**
* Called to inform Telemetry that shutdown is commencing.
*/
void EnteringShutdownStage();
/**
* Thresholds for a statement to be considered slow, in milliseconds
*/
const uint32_t kSlowSQLThresholdForMainThread = 50;
const uint32_t kSlowSQLThresholdForHelperThreads = 100;
class ProcessedStack;
/**
* Record the main thread's call stack after it hangs.
*
* @param aDuration - Approximate duration of main thread hang, in seconds
* @param aStack - Array of PCs from the hung call stack
* @param aSystemUptime - System uptime at the time of the hang, in minutes
* @param aFirefoxUptime - Firefox uptime at the time of the hang, in minutes
*/
#if defined(MOZ_ENABLE_PROFILER_SPS)
void RecordChromeHang(uint32_t aDuration,
ProcessedStack &aStack,
int32_t aSystemUptime,
int32_t aFirefoxUptime);
#endif
class ThreadHangStats;
/**
* Move a ThreadHangStats to Telemetry storage. Normally Telemetry queries
* for active ThreadHangStats through BackgroundHangMonitor, but once a
* thread exits, the thread's copy of ThreadHangStats needs to be moved to
* inside Telemetry using this function.
*
* @param aStats ThreadHangStats to save; the data inside aStats
* will be moved and aStats should be treated as
* invalid after this function returns
*/
void RecordThreadHangStats(ThreadHangStats& aStats);
/**
* Record a failed attempt at locking the user's profile.
*
* @param aProfileDir The profile directory whose lock attempt failed
*/
void WriteFailedProfileLock(nsIFile* aProfileDir);
} // namespace Telemetry
} // namespace mozilla
#endif // Telemetry_h__