Increased safepoint cleanup tasks in Java 11 (vs 8)

[Thomas Schatzl]

Hi,

On Wed, 2019-06-05 at 08:33 -0400, Vitaly Davidovich wrote:
> Hi all,
> 
[...]
> 
> My guess would be it's SAFEPOINT_CLEANUP_STRING_TABLE_REHASH because
> tiered compilation is disabled, ParallelGC is being used, and biased
> locking is disabled; all of this is the same as on Java 8.  Or might
> this be something else? Presumably it's something "new" in Java 11
> that triggers inside
> 
https://github.com/openjdk/jdk11u/blob/737d8437886ad97c6ed21a25b9911c10b3886f61/src/hotspot/share/runtime/safepoint.cpp#L644
> 
> Does anyone have ideas on pinpointing this further? How do I get the
> precise cleanup operation to show up in the log?

Given above link, considering the "TraceTime timer(name,
TRACETIME_LOG(Info, safepoint, cleanup))" lines, I would try adding
safepoint+cleanup=info to your log options.

Hth,
  Thomas