The parameter reduces the time spent in mark and keeps the mark phase running, even if a GC cycle is not in process.

此参数缩短了花在mark上的时间并在GC循环未在进行中时仍能保持mark阶段运行。

youdao

As we've seen with monitoring the verbose GC output, most of the time spent occurs in the mark phase of the GC cycle. For example.

正如从verbose GC的输出中能够看出的，GC循环的mark阶段花费了大多数时间。

youdao