12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #ifndef SHARE_GC_EPSILON_EPSILON_GLOBALS_HPP 27 #define SHARE_GC_EPSILON_EPSILON_GLOBALS_HPP 28 29 #include "runtime/globals_shared.hpp" 30 31 // 32 // Defines all globals flags used by the Epsilon GC. 33 // 34 35 #define GC_EPSILON_FLAGS(develop, \ 36 develop_pd, \ 37 product, \ 38 product_pd, \ 39 diagnostic, \ 40 diagnostic_pd, \ 41 experimental, \ 42 notproduct, \ 43 manageable, \ 44 product_rw, \ 45 lp64_product, \ 46 range, \ 47 constraint) \ 48 \ 49 experimental(size_t, EpsilonPrintHeapSteps, 20, \ 50 "Print heap occupancy stats with this number of steps. " \ 51 "0 turns the printing off.") \ 52 range(0, max_intx) \ 53 \ 54 experimental(size_t, EpsilonUpdateCountersStep, 1 * M, \ 55 "Update heap occupancy counters after allocating this much " \ 56 "memory. Higher values would make allocations faster at " \ 57 "the expense of lower resolution in heap counters.") \ 58 range(1, max_intx) \ 59 \ 60 experimental(size_t, EpsilonMaxTLABSize, 4 * M, \ 61 "Max TLAB size to use with Epsilon GC. Larger value improves " \ 62 "performance at the expense of per-thread memory waste. This " \ 63 "asks TLAB machinery to cap TLAB sizes at this value.") \ 64 range(1, max_intx) \ 65 \ 66 experimental(bool, EpsilonElasticTLAB, true, \ 67 "Use elastic policy to manage TLAB sizes. This conserves memory " \ 68 "for non-actively allocating threads, even when they request " \ 69 "large TLABs for themselves. Active threads would experience " \ 70 "smaller TLABs until policy catches up.") \ 71 \ 72 experimental(bool, EpsilonElasticTLABDecay, true, \ 73 "Use timed decays to shrik TLAB sizes. This conserves memory " \ 74 "for the threads that allocate in bursts of different sizes, " \ 75 "for example the small/rare allocations coming after the initial "\ 76 "large burst.") \ 77 \ 78 experimental(double, EpsilonTLABElasticity, 1.1, \ 79 "Multiplier to use when deciding on next TLAB size. Larger value "\ 80 "improves performance at the expense of per-thread memory waste. "\ 81 "Lower value improves memory footprint, but penalizes actively " \ 82 "allocating threads.") \ 83 range(1.0, DBL_MAX) \ 84 \ 85 experimental(size_t, EpsilonTLABDecayTime, 1000, \ 86 "TLAB sizing policy decays to initial size after thread had not " \ 87 "allocated for this long. Time is in milliseconds. Lower value " \ 88 "improves memory footprint, but penalizes actively allocating " \ 89 "threads.") \ 90 range(1, max_intx) \ 91 \ 92 experimental(size_t, EpsilonMinHeapExpand, 128 * M, \ 93 "Min expansion step for heap. Larger value improves performance " \ 94 "at the potential expense of memory waste.") \ 95 range(1, max_intx) 96 97 #endif // SHARE_GC_EPSILON_EPSILON_GLOBALS_HPP | 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #ifndef SHARE_GC_EPSILON_EPSILON_GLOBALS_HPP 27 #define SHARE_GC_EPSILON_EPSILON_GLOBALS_HPP 28 29 #include "runtime/globals_shared.hpp" 30 31 // 32 // Declare all globals flags used by the Epsilon GC. 33 // 34 35 #include "utilities/macros.hpp" 36 #if INCLUDE_EPSILONGC 37 #include "runtime/flags/jvmFlag.hpp" 38 PRODUCT_FLAG(size_t, EpsilonPrintHeapSteps, 20, JVMFlag::EXPERIMENTAL | JVMFlag::RANGE, 39 "Print heap occupancy stats with this number of steps. " 40 "0 turns the printing off."); 41 FLAG_RANGE( EpsilonPrintHeapSteps, 0, max_intx); 42 43 PRODUCT_FLAG(size_t, EpsilonUpdateCountersStep, 1 * M, JVMFlag::EXPERIMENTAL | JVMFlag::RANGE, 44 "Update heap occupancy counters after allocating this much " 45 "memory. Higher values would make allocations faster at " 46 "the expense of lower resolution in heap counters."); 47 FLAG_RANGE( EpsilonUpdateCountersStep, 1, max_intx); 48 49 PRODUCT_FLAG(size_t, EpsilonMaxTLABSize, 4 * M, JVMFlag::EXPERIMENTAL | JVMFlag::RANGE, 50 "Max TLAB size to use with Epsilon GC. Larger value improves " 51 "performance at the expense of per-thread memory waste. This " 52 "asks TLAB machinery to cap TLAB sizes at this value."); 53 FLAG_RANGE( EpsilonMaxTLABSize, 1, max_intx); 54 55 PRODUCT_FLAG(bool, EpsilonElasticTLAB, true, JVMFlag::EXPERIMENTAL, 56 "Use elastic policy to manage TLAB sizes. This conserves memory " 57 "for non-actively allocating threads, even when they request " 58 "large TLABs for themselves. Active threads would experience " 59 "smaller TLABs until policy catches up."); 60 61 PRODUCT_FLAG(bool, EpsilonElasticTLABDecay, true, JVMFlag::EXPERIMENTAL, 62 "Use timed decays to shrik TLAB sizes. This conserves memory " 63 "for the threads that allocate in bursts of different sizes, " 64 "for example the small/rare allocations coming after the initial " 65 "large burst."); 66 67 PRODUCT_FLAG(double, EpsilonTLABElasticity, 1.1, JVMFlag::EXPERIMENTAL | JVMFlag::RANGE, 68 "Multiplier to use when deciding on next TLAB size. Larger value " 69 "improves performance at the expense of per-thread memory waste. " 70 "Lower value improves memory footprint, but penalizes actively " 71 "allocating threads."); 72 FLAG_RANGE( EpsilonTLABElasticity, 1.0, DBL_MAX); 73 74 PRODUCT_FLAG(size_t, EpsilonTLABDecayTime, 1000, JVMFlag::EXPERIMENTAL | JVMFlag::RANGE, 75 "TLAB sizing policy decays to initial size after thread had not " 76 "allocated for this long. Time is in milliseconds. Lower value " 77 "improves memory footprint, but penalizes actively allocating " 78 "threads."); 79 FLAG_RANGE( EpsilonTLABDecayTime, 1, max_intx); 80 81 PRODUCT_FLAG(size_t, EpsilonMinHeapExpand, 128 * M, JVMFlag::EXPERIMENTAL | JVMFlag::RANGE, 82 "Min expansion step for heap. Larger value improves performance " 83 "at the potential expense of memory waste."); 84 FLAG_RANGE( EpsilonMinHeapExpand, 1, max_intx); 85 #endif // INCLUDE_EPSILONGC 86 87 #endif // SHARE_GC_EPSILON_EPSILON_GLOBALS_HPP |