RFR (S) 8072693: [BACKOUT] GCCause should distinguish jcmd GC.run from System.gc()
mikael.gerdin at oracle.com
Fri Feb 6 15:10:31 UTC 2015
There are some problems with the Diagnostic Command GCCause change, I
suggest that we back out the change and reconsider its implementation.
[from the bug]
The change is incomplete since several places in the GC code assumes
that explicit gcs have the _java_lang_system_gc GCCause value in order
to determine the behavior.
ParallelGC does not apply policy decisions on user-invoked GCs (decided
by the GCCause)
G1/CMS honors +ExplicitGCInvokesConcurrent based on the GCCause setting.
This could cause problems for people expecting concurrent gcs when
running the diagnostic command instead of a possibly several-second full
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