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6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent

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Count enable_icms() and disable_icms() events so as to prevent inteference between concurrent calls, which can cause the iCMS thread to be left stranded in icms_wait() with an unserviced request and no young allocations to unwedge it.

Reviewed-by: jcoomes, poonam
This commit is contained in:
Y. Srinivas Ramakrishna 2011-03-14 21:52:24 -07:00
parent edb9e105eb
commit a3de65241c
5 changed files with 44 additions and 20 deletions
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5
hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp
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@ -128,11 +128,14 @@ class VM_CMS_Final_Remark: public VM_CMS_Operation {
// VM operation to invoke a concurrent collection of the heap as a
// GenCollectedHeap heap.
class VM_GenCollectFullConcurrent: public VM_GC_Operation {
bool _disabled_icms;
public:
VM_GenCollectFullConcurrent(unsigned int gc_count_before,
unsigned int full_gc_count_before,
GCCause::Cause gc_cause)
: VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true /* full */) {
: VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true /* full */),
_disabled_icms(false)
{
assert(FullGCCount_lock != NULL, "Error");
assert(UseAsyncConcMarkSweepGC, "Else will hang caller");
}