All the apps on your phone feed log data into the Android logcat, but maybe you don't want the log to have all that information about what you're doing on the phone. If you're rooted, a new app from Wanam can help. Stop Log disables all Android loggers at the system level.
The most obvious benefit is privacy, if that's the sort of thing you're worried about. On unrooted devices, apps are only able to see their own logcats. However, the logcat can be accessed with ADB, assuming someone has physical access to your device. No log, no sensitive data, right? The developer also claims that disabling logging will improve performance, but that depends on how much data is being dropped into the log. Your mileage may vary on that one, but beware confirmation bias.
You have a bit of control over which logs are blocked with Stop Log—any combination of main, radio, event, and system logs can be killed. Stop Log should work on any rooted Android device running Android 4.3 or higher.