首先看看Android对logcat 的介绍：

logcat

The Android logging system provides a mechanism for collecting and viewing system debug output. Logs from various applications and portions of the system are collected in a series of circular buffers, which then can be viewed and filtered by the logcat command. You can use logcat from an ADB shell to view the log messages.

For complete information about logcat options and filtering specifications, see Reading and Writing Logs.

For more information on accessing logcat from DDMS, instead of the command line, see Using DDMS.

Syntax

[adb] logcat [<option>] ... [<filter-spec>] ...

You can run logcat as an adb command or directly in a shell prompt of your emulator or connected device. To view log output using adb, navigate to your SDK platform-tools/ directory and execute:

$ adb logcat

You can create a shell connection to a device and execute:

$ adb shell# logcat

Options

The following table describes the command line options of logcat.

Option	Description
`-b`	Loads an alternate log buffer for viewing, such as `event` or `radio`. The `main` buffer is used by default. See Viewing Alternative Log Buffers.
`-c`	Clears (flushes) the entire log and exits.
`-d`	Dumps the log to the screen and exits.
`-f`	Writes log message output to . The default is `stdout`.
`-g`	Prints the size of the specified log buffer and exits.
`-n`	Sets the maximum number of rotated logs to . The default value is 4. Requires the `-r` option.
`-r`	Rotates the log file every of output. The default value is 16. Requires the `-f` option.
`-s`	Sets the default filter spec to silent.
`-v`	Sets the output format for log messages. The default is `brief` format. For a list of supported formats, see Controlling Log Output Format.

举例说明：init.rc 里可以定义将logcat + logcat-radio 的log都指定到aplog文件中，20个文件循环写

service ap_logfs /sbin/logcat -b system -b events -b main -b radio -n 20 -r 5000 -v threadtime -f /logs/aplog

disabled

service apk_logfs /sbin/logcat -b system -b events -b main -b radio -n 20 -r 5000 -v threadtime -f /logs/aplog -K
disabled

100M的log基本够用了。

Android(安卓)logcat log size -- Android(安卓)logcat log 大小限制如何设置

logcat

Syntax

Options

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