src/os/linux/vm/os_linux.cpp

rev 4531 : 8013398: Adjust number of stack guard pages on systems with large memory page size
Summary: Auto adjust number of stack guard pages on systems with large memory page size
Reviewed-by: bobv, coleenp

*** 136,145 ****
--- 136,146 ----
  int (*os::Linux::_clock_gettime)(clockid_t, struct timespec *) = NULL;
  int (*os::Linux::_pthread_getcpuclockid)(pthread_t, clockid_t *) = NULL;
  Mutex* os::Linux::_createThread_lock = NULL;
  pthread_t os::Linux::_main_thread;
  int os::Linux::_page_size = -1;
+ const int os::Linux::_vm_default_page_size = (8 * K);
  bool os::Linux::_is_floating_stack = false;
  bool os::Linux::_is_NPTL = false;
  bool os::Linux::_supports_fast_thread_cpu_time = false;
  const char * os::Linux::_glibc_version = NULL;
  const char * os::Linux::_libpthread_version = NULL;
*** 4383,4392 ****
--- 4384,4402 ----
    Linux::_main_thread = pthread_self();
  
    Linux::clock_init();
    initial_time_count = os::elapsed_counter();
    pthread_mutex_init(&dl_mutex, NULL);
+ 
+   // If the pagesize of the VM is greater than 8K determine the appropriate
+   // number of initial guard pages.  The user can change this with the
+   // command line arguments, if needed.
+   if (vm_page_size() > (int)Linux::vm_default_page_size()) {
+     StackYellowPages = 1;
+     StackRedPages = 1;
+     StackShadowPages = round_to((StackShadowPages*Linux::vm_default_page_size()), vm_page_size()) / vm_page_size();
+   }
  }
  
  // To install functions for atexit system call
  extern "C" {
    static void perfMemory_exit_helper() {
*** 4436,4447 ****
    // the java system classes, including StackOverflowError - depends on page
    // size.  Add a page for compiler2 recursion in main thread.
    // Add in 2*BytesPerWord times page size to account for VM stack during
    // class initialization depending on 32 or 64 bit VM.
    os::Linux::min_stack_allowed = MAX2(os::Linux::min_stack_allowed,
!             (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
!                     2*BytesPerWord COMPILER2_PRESENT(+1)) * Linux::page_size());
  
    size_t threadStackSizeInBytes = ThreadStackSize * K;
    if (threadStackSizeInBytes != 0 &&
        threadStackSizeInBytes < os::Linux::min_stack_allowed) {
          tty->print_cr("\nThe stack size specified is too small, "
--- 4446,4457 ----
    // the java system classes, including StackOverflowError - depends on page
    // size.  Add a page for compiler2 recursion in main thread.
    // Add in 2*BytesPerWord times page size to account for VM stack during
    // class initialization depending on 32 or 64 bit VM.
    os::Linux::min_stack_allowed = MAX2(os::Linux::min_stack_allowed,
!             (size_t)(StackYellowPages+StackRedPages+StackShadowPages) * Linux::page_size() +
!                     (2*BytesPerWord COMPILER2_PRESENT(+1)) * Linux::vm_default_page_size());
  
    size_t threadStackSizeInBytes = ThreadStackSize * K;
    if (threadStackSizeInBytes != 0 &&
        threadStackSizeInBytes < os::Linux::min_stack_allowed) {
          tty->print_cr("\nThe stack size specified is too small, "