〖Android〗/system/etc/event-log-tags

一博客中，一段的注释的解释：[From: http://blog.csdn.net/hustpzb/article/details/8525324]

/**
 * Access to the system diagnostic event record.  System diagnostic events are
 * used to record certain system-level events (such as garbage collection,
 * activity manager state, system watchdogs, and other low level activity),
 * which may be automatically collected and analyzed during system development.
 *
 * <p>This is <b>not</b> the main "logcat" debugging log ({@link android.util.Log})!
 * These diagnostic events are for system integrators, not application authors.
 *
 * <p>Events use integer tag codes corresponding to /system/etc/event-log-tags.
 * They carry a payload of one or more int, long, or String values.  The
 * event-log-tags file defines the payload contents for each type code.
 */  

在Google Andorid代码中：

system/core/include/cutils/event_tag_map.h 第24行

其中另一博客亦有详细的介绍：[From: http://blog.csdn.net/darkengine/article/details/8477502]

总而言之，按个人理解，这个是用来设定、配置输出日志(event log)格式的。