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src/hotspot/share/runtime/perfMemory.cpp
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@@ -51,10 +51,11 @@
char* PerfMemory::_end = NULL;
char* PerfMemory::_top = NULL;
size_t PerfMemory::_capacity = 0;
jint PerfMemory::_initialized = false;
PerfDataPrologue* PerfMemory::_prologue = NULL;
+bool PerfMemory::_destroyed = false;
void perfMemory_init() {
if (!UsePerfData) return;
@@ -62,11 +63,11 @@
}
void perfMemory_exit() {
if (!UsePerfData) return;
- if (!PerfMemory::is_initialized()) return;
+ if (!PerfMemory::is_usable()) return;
// Only destroy PerfData objects if we're at a safepoint and the
// StatSampler is not active. Otherwise, we risk removing PerfData
// objects that are currently being used by running JavaThreads
// or the StatSampler. This method is invoked while we are not at
@@ -86,11 +87,11 @@
PerfMemory::destroy();
}
void PerfMemory::initialize() {
- if (_prologue != NULL)
+ if (is_initialized())
// initialization already performed
return;
size_t capacity = align_up(PerfDataMemorySize,
os::vm_allocation_granularity());
@@ -158,11 +159,11 @@
OrderAccess::release_store(&_initialized, 1);
}
void PerfMemory::destroy() {
- if (_prologue == NULL) return;
+ if (!is_usable()) return;
if (_start != NULL && _prologue->overflow != 0) {
// This state indicates that the contiguous memory region exists and
// that it wasn't large enough to hold all the counters. In this case,
@@ -194,15 +195,11 @@
// expected to be the typical condition.
//
delete_memory_region();
}
- _start = NULL;
- _end = NULL;
- _top = NULL;
- _prologue = NULL;
- _capacity = 0;
+ _destroyed = true;
}
// allocate an aligned block of memory from the PerfData memory
// region. This method assumes that the PerfData memory region
// was aligned on a double word boundary when created.
@@ -211,11 +208,11 @@
if (!UsePerfData) return NULL;
MutexLocker ml(PerfDataMemAlloc_lock);
- assert(_prologue != NULL, "called before initialization");
+ assert(is_usable(), "called before init or after destroy");
// check that there is enough memory for this request
if ((_top + size) >= _end) {
_prologue->overflow += (jint)size;
@@ -236,10 +233,12 @@
}
void PerfMemory::mark_updated() {
if (!UsePerfData) return;
+ assert(is_usable(), "called before init or after destroy");
+
_prologue->mod_time_stamp = os::elapsed_counter();
}
// Returns the complete path including the file name of performance data file.
// Caller is expected to release the allocated memory.
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