10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 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 OS_AIX_GLOBALS_AIX_HPP 27 #define OS_AIX_GLOBALS_AIX_HPP 28 29 // 30 // Defines Aix specific flags. They are not available on other platforms. 31 // 32 // (Please keep the switches sorted alphabetically.) 33 #define RUNTIME_OS_FLAGS(develop, \ 34 develop_pd, \ 35 product, \ 36 product_pd, \ 37 diagnostic, \ 38 diagnostic_pd, \ 39 notproduct, \ 40 range, \ 41 constraint) \ 42 \ 43 /* Whether to allow the VM to run if EXTSHM=ON. EXTSHM is an environment */ \ 44 /* variable used on AIX to activate certain hacks which allow more shm segments */\ 45 /* for 32bit processes. For 64bit processes, it is pointless and may have */ \ 46 /* harmful side effects (e.g. for some reasonn prevents allocation of 64k pages */\ 47 /* via shmctl). */ \ 48 /* Per default we quit with an error if that variable is found; for certain */ \ 49 /* customer scenarios, we may want to be able to run despite that variable. */ \ 50 product(bool, AllowExtshm, false, \ 51 "Allow VM to run with EXTSHM=ON.") \ 52 \ 53 /* Maximum expected size of the data segment. That correlates with the */ \ 54 /* to the maximum C Heap consumption we expect. */ \ 55 /* We need to know this because we need to leave "breathing space" for the */ \ 56 /* data segment when placing the java heap. If that space is too small, we */ \ 57 /* reduce our chance of getting a low heap address (needed for compressed */ \ 58 /* Oops). */ \ 59 product(uintx, MaxExpectedDataSegmentSize, 8*G, \ 60 "Maximum expected Data Segment Size.") \ 61 \ 62 /* Use optimized addresses for the polling page. */ \ 63 product(bool, OptimizePollingPageLocation, true, \ 64 "Optimize the location of the polling page used for Safepoints") \ 65 \ 66 /* Use 64K pages for virtual memory (shmat). */ \ 67 product(bool, Use64KPages, true, \ 68 "Use 64K pages if available.") \ 69 \ 70 /* If VM uses 64K paged memory (shmat) for virtual memory: threshold below */ \ 71 /* which virtual memory allocations are done with 4K memory (mmap). This is */ \ 72 /* mainly for test purposes. */ \ 73 develop(uintx, Use64KPagesThreshold, 0, \ 74 "4K/64K page allocation threshold.") \ 75 \ 76 /* Normally AIX commits memory on touch, but sometimes it is helpful to have */ \ 77 /* explicit commit behaviour. This flag, if true, causes the VM to touch */ \ 78 /* memory on os::commit_memory() (which normally is a noop). */ \ 79 product(bool, UseExplicitCommit, false, \ 80 "Explicit commit for virtual memory.") \ 81 \ 82 83 84 // 85 // Defines Aix-specific default values. The flags are available on all 86 // platforms, but they may have different default values on other platforms. 87 // 88 89 // UseLargePages means nothing, for now, on AIX. 90 // Use Use64KPages or Use16MPages instead. 91 define_pd_global(bool, UseLargePages, false); 92 define_pd_global(bool, UseLargePagesIndividualAllocation, false); 93 define_pd_global(bool, UseOSErrorReporting, false); 94 define_pd_global(bool, UseThreadPriorities, true) ; 95 96 #endif // OS_AIX_GLOBALS_AIX_HPP | 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 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 OS_AIX_GLOBALS_AIX_HPP 27 #define OS_AIX_GLOBALS_AIX_HPP 28 29 // 30 // Declare Aix specific flags. They are not available on other platforms. 31 // 32 // (Please keep the switches sorted alphabetically.) 33 #include "runtime/flags/jvmFlag.hpp" 34 35 // Whether to allow the VM to run if EXTSHM=ON. EXTSHM is an environment 36 // variable used on AIX to activate certain hacks which allow more shm segments 37 // for 32bit processes. For 64bit processes, it is pointless and may have 38 // harmful side effects (e.g. for some reasonn prevents allocation of 64k pages 39 // via shmctl). 40 // Per default we quit with an error if that variable is found; for certain 41 // customer scenarios, we may want to be able to run despite that variable. 42 PRODUCT_FLAG(bool, AllowExtshm, false, JVMFlag::DEFAULT, 43 "Allow VM to run with EXTSHM=ON."); 44 45 46 // Maximum expected size of the data segment. That correlates with the 47 // to the maximum C Heap consumption we expect. 48 // We need to know this because we need to leave "breathing space" for the 49 // data segment when placing the java heap. If that space is too small, we 50 // reduce our chance of getting a low heap address (needed for compressed 51 // Oops). 52 PRODUCT_FLAG(uintx, MaxExpectedDataSegmentSize, 8*G, JVMFlag::DEFAULT, 53 "Maximum expected Data Segment Size."); 54 55 56 // Use optimized addresses for the polling page. 57 PRODUCT_FLAG(bool, OptimizePollingPageLocation, true, JVMFlag::DEFAULT, 58 "Optimize the location of the polling page used for Safepoints"); 59 60 61 // Use 64K pages for virtual memory (shmat). 62 PRODUCT_FLAG(bool, Use64KPages, true, JVMFlag::DEFAULT, 63 "Use 64K pages if available."); 64 65 66 // If VM uses 64K paged memory (shmat) for virtual memory: threshold below 67 // which virtual memory allocations are done with 4K memory (mmap). This is 68 // mainly for test purposes. 69 DEVELOP_FLAG(uintx, Use64KPagesThreshold, 0, JVMFlag::DEFAULT, 70 "4K/64K page allocation threshold."); 71 72 73 // Normally AIX commits memory on touch, but sometimes it is helpful to have 74 // explicit commit behaviour. This flag, if true, causes the VM to touch 75 // memory on os::commit_memory() (which normally is a noop). 76 PRODUCT_FLAG(bool, UseExplicitCommit, false, JVMFlag::DEFAULT, 77 "Explicit commit for virtual memory."); 78 79 // 80 // Define Aix-specific default values. The flags are available on all 81 // platforms, but they may have different default values on other platforms. 82 // 83 84 // UseLargePages means nothing, for now, on AIX. 85 // Use Use64KPages or Use16MPages instead. 86 define_pd_global(bool, UseLargePages, false); 87 define_pd_global(bool, UseLargePagesIndividualAllocation, false); 88 define_pd_global(bool, UseOSErrorReporting, false); 89 define_pd_global(bool, UseThreadPriorities, true) ; 90 91 #endif // OS_AIX_GLOBALS_AIX_HPP |