gc-log is within STW event?

[Ron Reynolds]

this blog
https://engineering.linkedin.com/blog/2016/02/eliminating-large-jvm-gc-pauses-caused-by-background-io-traffic
raises the question i my mind - why would logging to gc-log be done during
a STW event at all?  wouldn't it make sense to defer gc-logging to after
the STW event?  i suppose writing/flushing to gc-log would allow one to
monitor GC progress DURING a STW event but is that worth the risk of being
suspended during a STW by IO operations?
sorry if this is the wrong channel to ask such questions.
.....................ron.
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