hsperfdata causing long GC/safepoint times: Don't use mmap?

[Evan Jones]

On Thu, Mar 26, 2015 at 11:33 AM, Mikael Gerdin <mikael.gerdin at oracle.com>
wrote:
>
> Have the VM asynchronously update the values in the hsperfdata file by
> caching the new values somewhere in memory and using the ServiceThread to
> commit the updated values to the mmaped perf data?
>

This approach could work, but wouldn't it have to be a native thread? I
thought the ServiceThread is actually a Java thread, so it needs to reach
safepoints with all the others? It seems reasonable to have the statistics
in private memory, periodically written out to /tmp by some other JVM
thread.

Thanks for filing the bug!