Bug ID: JDK-6944195 jmap -{histo,dump}:live, +PrintClassHistogram and friends should stall for GC locker to clear

JDK-6944195 : jmap -{histo,dump}:live, +PrintClassHistogram and friends should stall for GC locker to clear

Type: Enhancement
Component: hotspot
Sub-Component: gc
Affected Version: 7

Priority: P4
Status: Closed
Resolution: Won't Fix
OS: generic
CPU: generic

Submitted: 2010-04-15
Updated: 2020-04-08
Resolved: 2016-02-19

Related Reports

Duplicate :	JDK-8241722 - PrintClassHistogram operation should be cancelled during GC locked
Relates :	JDK-6897143 - Stress test crashes during HeapInspection using ParallelGC.
Relates :	JDK-6186200 - RFE: Stall allocation requests while heap is full and GC locker is held
Relates :	JDK-8241722 - PrintClassHistogram operation should be cancelled during GC locked

Description

See CR 6897143. As it states, when a GC locker is held, a GC request
preceding a histogram or heap dump may be skipped. This can cause
user confusion who expects the objects in the histogram/dump to be
those very recently reachable and none that may have become unreachable
a long time ago. This bug is being filed so that that shortcoming may
be corrected.