Have you ever encountered a situation where a smartphone on Android starts to slow down, applications crash for no reason, and the battery runs out in a few hours? In such cases, experts often talk about the need to “trace the system.” But what is this process, how does it work and can an ordinary user use it without the risk of turning the phone into a “brick”?

Tracing (or tracing) is a method of collecting detailed information about the operation of the operating system and applications in real time. Unlike standard logs, which record only critical errors, tracing allows you to see a complete chain of events down to microsecondsincluding the interaction of the kernel, drivers, processes and threads. This tool is indispensable for diagnosing complex bugs, optimizing performance and even reverse engineering.

In this article we will look at:

  • 🔍 What is tracing and how it differs from regular logs
  • 📊 What types of tracing exist in Android and where are they used
  • ⚙️ How to enable tracing on your device (including hidden settings)
  • ⚠️ Risks and limitationswhich are not mentioned warn in the manuals
  • 🛠️ Practical cases: when tracing saves and when it is useless
📊 Have you ever used diagnostic tools on Android?
Yes, for debugging applications
Yes, to find the cause of the brakes
No, but I want to learn
No, and I don’t plan to

1. Tracing vs logs: what is the difference and why are both tools needed

Many users confuse tracing with regular logs (logcat), but these are fundamentally different mechanisms. Logs record events (for example, an application startup error or network failure), while a trace records processes that is, the sequence of actions that led to the event.

Imagine that your a smartphone is a factory:

  • 📜 Logs - these are reports on defects on the assembly line (“at 14:30 a defective phone came off”)
  • 🎥 Trace - these are video recordings of the entire workshop, where you can see which worker pressed the wrong button when, why the tape stopped and how it affected others station.

In practice, this means that the logs will help to find out what went wrong, and tracing - what went wrong, and the trace - why and how. For example, if the game lags, the logs will show a rendering error, and the trace will show that the processor at that moment was occupied by a background process mediaserverthat was processing a corrupt video file in the gallery.

⚠️ Attention: Tracing creates a huge load on the system. On weak devices (for example Samsung Galaxy J2 2016 or Xiaomi Redmi 4A), continuous recording of traces can lead to overheating or sudden reboot. Always monitor the processor temperature!

2. Types of tracing in Android: from user tools to low-level

Android supports several types of tracing, differing in the depth of analysis and complexity of configuration. Here are the main ones:

Trace type Access level What is recorded Use example
Systrace Custom (ADB) Interaction of processes, CPU, GPU, disk operations Diagnostics of lags in games or slow scrolling of the interface
ftrace Root/Kernel Linux kernel operation, interrupts, task scheduler Search for causes of random reboots or freezes
Perfetto Custom/Developer Cross-platform traces (Android 10+) Performance analysis of complex applications (for example, Chrome or Genshin Impact)
ATrace Developer (NDK) Events inside native code (C/C++) Debugging libraries or drivers (for example, for a camera)

For most users, Systrace or Perfetto is enough - they do not require root access and provide enough data to analyze typical problems A. This ftrace and ATrace are used by engineers for deep debugging, for example, when you need to find a memory leak in the firmware or a driver conflict.

Interesting fact: in Android 12 and newer trace Perfetto integrated into the system by default. This means that even if you are not a developer, your device already collects basic traces for diagnostics - they can be retrieved through adb or special applications.

💡

If your smartphone is slow after updating to Android 13+, try enabling Easy tracing in the developer settings (Settings → System → For developers → Easy tracing). This will help collect data without putting a heavy load on the battery.

3. How to enable tracing on your Android device: step-by-step guide

Before you start, make sure that you have:

  • 📱 Smartphone Android 7.0 or newer (some tools are not available on older versions).
  • 🖥️ A computer with installed ADB and Fastboot (for advanced methods).
  • 🔌 USB cable (preferably original - cheap ones often cause connection errors).

The easiest way to get started is to use the built-in developer tools:

  1. Activate Developer Mode:

    Go to Settings → About phone → Build number and tap on it 7 times. A notification “You have become a developer” will appear.

  2. Enable USB debugging:

    Return to Settings → System → For Developers i activate the switch USB Debugging. Confirm the resolution on the connected computer.

  3. Run tracing via adb:

    Connect the phone to the PC and run the command:

    adb shell am start -a android.intent.action.TRACE_INPUT_METHOD_LATENCY

    This will start recording input lags (useful for diagnosing keyboard lag).

For deeper analysis, use Perfetto:

adb shell perfetto --txt -c - -o trace.perfetto

After recording is complete, press Ctrl+C


adb pull /data/local/tmp/trace.perfetto

⚠️ Attention: On some devices (for example, Huawei or Oppo with custom firmware), access to the trace may be blocked by the manufacturer. In this case, only unlocking the bootloader or using alternative methods via logcat.

Charge the phone to at least 50%|Disable unnecessary background applications|Connect to the PC via the original cable|Check for free space (traces take up to 100 MB/min)|Make a backup copy of important data-->

4. Analysis of the results: how to read traces and what to look for

The collected data is only half the battle. The main thing is to interpret them correctly. Let's look at the main "symptoms" of problems in the traces:

  • ⏳ Long blocking: If the graph CPU shows that the process is occupying the core for more than 50 ms, this is a sign of a “freeze”. A common cause: poorly optimized loops in applications or drivers.
  • 🔥 Overheating: In traces thermal-engine look for events throttling —they show when the system forcibly reduces the processor frequency due to high temperature.
  • 🗑️ Memory leaks: B Perfetto look at the graph heap - if it increases even when the application is minimized, this is a leak.
  • 📉 FPS drops: B traces SurfaceFlinger look for delays between frames (>16 ms for 60 FPS). Culprits: heavy animations or conflicts with wallpaper.

To visualize traces, use:

  • 🖥️ Perfetto UI (https://ui.perfetto.dev/) - a web tool for detailed analysis.
  • 📊 Android Studio Profiler - convenient for developers, shows CPU, memory and network at one time scale.
  • 📈 Traceview (outdated, but still found in old guides) - replaced by Perfetto in new versions of Android.

Example: if the trace shows that the process com.android.systemui consumes 30% CPU in the background, this may indicate a bug in the firmware (often found on MIUI or ColorOS after updates). Solution: reset the interface settings or roll back to the previous version of the software.

How to find the culprit of the battery drain?

In traces Power Rail look for events wake_lock and sensor_ind. If some application (for example Facebook or Tinkoff Bank) holds wake_lock more than 10 minutes in a row, it is the culprit. Remove or limit its operation in the background via Settings → Applications → Special access → Battery optimization

5. Risks and pitfalls: what you should be wary of

Tracing is a powerful tool, but not harmless. Here are the key risks:

  1. Hardware load:

    Continuous recording of traces can increase battery consumption by 20-40% and cause overheating. On Snapdragon 8 Gen 1 and similar “hot” chips this is especially critical.

  2. Privacy:

    Traces contain detailed information about your actionsincluding clicks, running applications and even fragments of data (for example, parts of messages in WhatsApp). Do not share raw traces with outsiders!

  3. False positives:

    Not all delays in traces are bugs. For example, PackageManager may freeze for 200 ms when you first launch the application - this is normal (caching).

  4. Resetting settings:

    On some devices (for example, Sony Xperiaactivating deep tracing via ftrace may cause network settings to be reset.

⚠️ Attention: If you are using trace to diagnose problems with root access, remember: some banking applications (for example, SberBank Online or Tinkoff) block work on devices with an unlocked bootloader or active debugging. Before tracing, disable such applications or use a second phone.

6. Practical cases: when tracing saves and when it is useless

Not all problems can be solved by tracing. Here are real examples when it helps and when it doesn’t:

Problem Will tracing help? What to do instead
Game PUBG Mobile lags on high settings ✅ Yes Look for FPS drawdowns in traces SurfaceFlinger i GPU. A common reason: throttling due to overheating.
The phone spontaneously reboots ✅ Yes (partially) Check the traces kernel panic in ftrace. If there is no reason, a hardware failure is to blame (for example, a BGA blade on the motherboard).
Bluetooth headphones do not work ❌ No Trace is useless here. Check logcat for errors BluetoothAdapter or reset the network settings.
Battery drains quickly in standby mode ✅ Yes Analyze traces Power Rail i Alarm Manager. Culprits: applications with constant wake_lock (for example, AliExpress or Avito).
The camera does not work (black screen) ⚠️ Possibly If the problem is in the driver - traceback ATrace will help. If there is a physical breakdown (for example, after a fall) - only repair.

Important nuance: tracing is useless for diagnostics hardware problems (for example, a broken screen, faulty battery or chip failure). In such cases, it will only take time and battery power.

💡

Tracing is effective for software bugs, but not for physical breakdowns. If the phone does not turn on, heats up without a load, or does not see the SIM card, take it to the service center rather than delve into traces.

7. Alternatives to tracing: when it's easier to use other tools

Tracing is not a panacea. In many cases, it is easier and faster to use other diagnostic methods:

  • 🔄 logcat — to find errors in applications (for example, ANR — “Application Not Responding”). Command:
    • adb logcat | grep -E "ANR|crash|Exception"
  • 📊 Android Profiler — for analyzing memory and CPU consumption in real time (included in Android Studio).
  • 🔋 AccuBattery — for monitoring battery discharge without deep tracing.
  • 🛠️ Safe Mode — if the phone is slow, boot into safe mode (hold the power off button → “Safe Mode”). If the lags disappear, a third party is to blame application.

Example: if Google Play Market it constantly crashes, just look logcat for errors like:

E/AndroidRuntime(12345): FATAL EXCEPTION: main

Process: com.android.vending, PID: 12345


java.lang.NullPointerException: Attempt to invoke virtual method on a null object

Here the tracing is redundant - the problem is clearly in the application code, not in system.

8. Conclusion: is it worth it for the average user to master tracing?

If you are not a developer or an enthusiast who likes to delve into systems, tracing is unlikely to become your daily tool. However, knowledge of the basics it will be useful in three cases:

  1. You want diagnose yourself complex bugs (for example, random reboots or lags in games).

  2. You testing custom firmware (for example, LineageOS or Pixel Experience) and want to report bugs to the developers.

  3. You suspect that the manufacturer is hiding problems in the firmware (for example, throttling on MediaTek Helio or bugs with power consumption Exynos).

For other users, basic tools are sufficient like logcat or AccuBatteryBut if you decide to dive into tracing, start with Perfetto - this is the most beginner friendly tool.

Remember: 90% of problems on Android are solved without tracing - cache reset, software update or deletion conflicting applications. Don’t complicate your life if it’s not necessary!

💡

Tracing is like an x-ray: a powerful diagnostic tool, but not for daily use. Start with simple methods, and only if they don’t help, take on traces.

FAQ: Frequently asked questions. tracing on Android

Can I enable tracing without a computer?

Yes, but with limitations. On some devices (for example, Google Pixel or OnePlusthere is an option Developer settings there is an option Easy tracing. You can also use applications like Simpleperf or Trepn Profiler (require root for full functionality).

How much space do traces occupy?

Depends on the recording depth:

  • 📱 Basic tracing (1 minute): 10–50 MB.
  • 🖥️ Full tracing (ftrace + Perfetto, 1 minute): 100–500 MB.
  • 📀 Long recording (10+ minutes): up to several GB.

Always check free space before starting!

Can tracing cause damage phone?

The process of recording traces itself is not. But:

  • ⚡ If the device is discharged to zero during tracing, this can damage the file system (especially on older phones with eMMC instead of UFS).
  • 🔥 Overheating due to high load can theoretically shorten the life of the processor (relevant for Snapdragon 888/8 Gen 1).

Risks are minimal if you monitor the charge and temperature.

How to send traces to developers for analysis?

If you find a bug in the firmware or application:

  1. Compress the traces into an archive (.zip or .7z).
  2. Delete personal data (for example, via sed or manually in a text editor).
  3. Upload to Google Drive or Dropbox and provide a link in the bug report.

For open projects (for example, LineageOS) use GitHub Issues or Jira.

Does tracing work on custom firmware?

Yes, but with nuances:

  • ✅ On AOSP-based firmwares (for example, Pixel Experience), tracing works normally.
  • ⚠️ On firmware with a highly modified kernel (for example, some assemblies MIUI or Flyme) may be missing some events in ftrace.
  • ❌ On firmware without support perf_events (rare, but found on some MTKdevices), tracing will be incomplete.