1821 // region specified by <address, size> will be inaccessible after
1822 // a call to this method.
1823 //
1824 // If the JVM chooses not to support the attachability feature,
1825 // this method should throw an UnsupportedOperation exception.
1826 //
1827 // This implementation utilizes named shared memory to detach
1828 // the indicated process's PerfData memory region from this
1829 // process's address space.
1830 //
1831 void PerfMemory::detach(char* addr, size_t bytes, TRAPS) {
1832
1833 assert(addr != 0, "address sanity check");
1834 assert(bytes > 0, "capacity sanity check");
1835
1836 if (PerfMemory::contains(addr) || PerfMemory::contains(addr + bytes - 1)) {
1837 // prevent accidental detachment of this process's PerfMemory region
1838 return;
1839 }
1840
1841 if (MemTracker::tracking_level() > NMT_minimal) {
1842 // it does not go through os api, the operation has to record from here
1843 Tracker tkr = MemTracker::get_virtual_memory_release_tracker();
1844 remove_file_mapping(addr);
1845 tkr.record((address)addr, bytes);
1846 } else {
1847 remove_file_mapping(addr);
1848 }
1849 }
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1821 // region specified by <address, size> will be inaccessible after
1822 // a call to this method.
1823 //
1824 // If the JVM chooses not to support the attachability feature,
1825 // this method should throw an UnsupportedOperation exception.
1826 //
1827 // This implementation utilizes named shared memory to detach
1828 // the indicated process's PerfData memory region from this
1829 // process's address space.
1830 //
1831 void PerfMemory::detach(char* addr, size_t bytes, TRAPS) {
1832
1833 assert(addr != 0, "address sanity check");
1834 assert(bytes > 0, "capacity sanity check");
1835
1836 if (PerfMemory::contains(addr) || PerfMemory::contains(addr + bytes - 1)) {
1837 // prevent accidental detachment of this process's PerfMemory region
1838 return;
1839 }
1840
1841 remove_file_mapping(addr);
1842
1843 MemTracker::record_virtual_memory_release(addr, bytes);
1844 }
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