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src/os/aix/vm/globals_aix.hpp

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rev 9449 : 8143125-Further Developments for AIX

*** 27,67 **** #define OS_AIX_VM_GLOBALS_AIX_HPP // // Defines Aix specific flags. They are not available on other platforms. // #define RUNTIME_OS_FLAGS(develop, develop_pd, product, product_pd, diagnostic, notproduct, range, constraint) \ \ /* Use 64K pages for virtual memory (shmat). */ \ product(bool, Use64KPages, true, \ "Use 64K pages if available.") \ \ ! /* If UseLargePages == true allow or deny usage of 16M pages. 16M pages are */ \ ! /* a scarce resource and there may be situations where we do not want the VM */ \ ! /* to run with 16M pages. (Will fall back to 64K pages). */ \ ! product_pd(bool, Use16MPages, \ ! "Use 16M pages if available.") \ ! \ ! /* use optimized addresses for the polling page, */ \ ! /* e.g. map it to a special 32-bit address. */ \ ! product_pd(bool, OptimizePollingPageLocation, \ ! "Optimize the location of the polling page used for Safepoints") \ \ ! product_pd(intx, AttachListenerTimeout, \ ! "Timeout in ms the attach listener waits for a request") \ ! range(0, 2147483) \ \ - // Per default, do not allow 16M pages. 16M pages have to be switched on specifically. - define_pd_global(bool, Use16MPages, false); - define_pd_global(bool, OptimizePollingPageLocation, true); - define_pd_global(intx, AttachListenerTimeout, 1000); // // Defines Aix-specific default values. The flags are available on all // platforms, but they may have different default values on other platforms. // define_pd_global(bool, UseLargePages, false); define_pd_global(bool, UseLargePagesIndividualAllocation, false); define_pd_global(bool, UseOSErrorReporting, false); define_pd_global(bool, UseThreadPriorities, true) ; --- 27,91 ---- #define OS_AIX_VM_GLOBALS_AIX_HPP // // Defines Aix specific flags. They are not available on other platforms. // + // (Please keep the switches sorted alphabetically.) #define RUNTIME_OS_FLAGS(develop, develop_pd, product, product_pd, diagnostic, notproduct, range, constraint) \ \ + /* Whether to allow the VM to run if EXTSHM=ON. EXTSHM is an environment */ \ + /* variable used on AIX to activate certain hacks which allow more shm segments */\ + /* for 32bit processes. For 64bit processes, it is pointless and may have */ \ + /* harmful side effects (e.g. for some reasonn prevents allocation of 64k pages */\ + /* via shmctl). */ \ + /* Per default we quit with an error if that variable is found; for certain */ \ + /* customer scenarios, we may want to be able to run despite that variable. */ \ + product(bool, AllowExtshm, false, \ + "Allow VM to run with EXTSHM=ON.") \ + \ + product(intx, AttachListenerTimeout, 1000, \ + "Timeout in ms the attach listener waits for a request") \ + range(0, 2147483) \ + \ + /* Maximum expected size of the data segment. That correlates with the */ \ + /* to the maximum C Heap consumption we expect. */ \ + /* We need to know this because we need to leave "breathing space" for the */ \ + /* data segment when placing the java heap. If that space is too small, we */ \ + /* reduce our chance of getting a low heap address (needed for compressed */ \ + /* Oops). */ \ + product(uintx, MaxExpectedDataSegmentSize, (SIZE_4G * 2), \ + "Maximum expected Data Segment Size.") \ + \ + /* Use optimized addresses for the polling page. */ \ + product(bool, OptimizePollingPageLocation, true, \ + "Optimize the location of the polling page used for Safepoints") \ + \ /* Use 64K pages for virtual memory (shmat). */ \ product(bool, Use64KPages, true, \ "Use 64K pages if available.") \ \ ! /* If VM uses 64K paged memory (shmat) for virtual memory: threshold below */ \ ! /* which virtual memory allocations are done with 4K memory (mmap). This is */ \ ! /* mainly for test purposes. */ \ ! develop(uintx, Use64KPagesThreshold, 0, \ ! "4K/64K page allocation threshold.") \ \ ! /* Normally AIX commits memory on touch, but sometimes it is helpful to have */ \ ! /* explicit commit behaviour. This flag, if true, causes the VM to touch */ \ ! /* memory on os::commit_memory() (which normally is a noop). */ \ ! product(bool, UseExplicitCommit, false, \ ! "Explicit commit for virtual memory.") \ \ // // Defines Aix-specific default values. The flags are available on all // platforms, but they may have different default values on other platforms. // + + // UseLargePages means nothing, for now, on AIX. + // Use Use64KPages or Use16MPages instead. define_pd_global(bool, UseLargePages, false); define_pd_global(bool, UseLargePagesIndividualAllocation, false); define_pd_global(bool, UseOSErrorReporting, false); define_pd_global(bool, UseThreadPriorities, true) ;
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