获取日志存储区中的可用字节数。
该类别中的系统计数器跟踪如可用字节和缓存字节等数据。
System counters within this category track data such as bytes available and bytes cached.
此类别内的系统计数器跟踪内存数据，如可用字节数和缓存的字节数。
System counters within this category track memory data such as the number of bytes available and the number of bytes cached.
作为良好的实践，每当向指针写入值时，都要确保对可用字节数和所写入的字节数进行交叉核对。
As a good practice, whenever writing values to Pointers make sure to cross check the number of bytes available and number of bytes being written.
从此开始，根据构架，为执行从用户缓冲区到内核缓冲区的零拷贝(不可用字节)而进行一个调用。
From here, depending on architecture, a call is made to copy from the user buffer to a kernel buffer with zeroing (of unavailable bytes).
从此开始，根据构架，为执行从用户缓冲区到内核缓冲区的零拷贝(不可用字节)而进行一个调用。
From here, depending on architecture, a call is made to copy from the user buffer to a kernel buffer with zeroing (of unavailable bytes).
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