src/os_cpu/linux_s390/vm/os_linux_s390.cpp

rev 12363 : 8169373: Work around linux NPTL stack guard error.
Summary: Also skip libc guard page for compiler thread, merge similar code on linux platforms, and streamline libc guard page handling on linuxs390, linuxppc, aixppc.
Reviewed-by: dholmes, dcubed, kvn

*** 471,577 ****
  }
  
  ////////////////////////////////////////////////////////////////////////////////
  // thread stack
  
  size_t os::Posix::_compiler_thread_min_stack_allowed = 128 * K;
! size_t os::Posix::_java_thread_min_stack_allowed = 128 * K;
  size_t os::Posix::_vm_internal_thread_min_stack_allowed = 128 * K;
  
! // return default stack size for thr_type
  size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
!   // default stack size (compiler thread needs larger stack)
    size_t s = (thr_type == os::compiler_thread ? 4 * M : 1024 * K);
    return s;
  }
  
- size_t os::Linux::default_guard_size(os::ThreadType thr_type) {
-   // z/Architecture: put 2 guard pages right in the middle of thread stack. This value
-   // should be consistent with the value used by register stack handling code.
-   return 2 * page_size();
- }
- 
- // Java thread:
- //
- //   Low memory addresses
- //    +------------------------+
- //    |                        |\
- //    |    glibc guard page    | - Right in the middle of stack, 2 pages
- //    |                        |/
- // P1 +------------------------+ Thread::stack_base() - Thread::stack_size()
- //    |                        |\
- //    |  HotSpot Guard Pages   | - red and yellow pages
- //    |                        |/
- //    +------------------------+ JavaThread::stack_yellow_zone_base()
- //    |                        |\
- //    |      Normal Stack      | -
- //    |                        |/
- // P2 +------------------------+ Thread::stack_base()
- //
- // Non-Java thread:
- //
- //   Low memory addresses
- //    +------------------------+
- //    |                        |\
- //    |    glibc guard page    | - Right in the middle of stack, 2 pages
- //    |                        |/
- // P1 +------------------------+ Thread::stack_base() - Thread::stack_size()
- //    |                        |\
- //    |      Normal Stack      | -
- //    |                        |/
- // P2 +------------------------+ Thread::stack_base()
- //
- // ** P2 is the address returned from pthread_attr_getstackaddr(), P2 - P1
- //    is the stack size returned by pthread_attr_getstacksize().
- 
- 
- static void current_stack_region(address * bottom, size_t * size) {
-   if (os::Linux::is_initial_thread()) {
-     // Initial thread needs special handling because pthread_getattr_np()
-     // may return bogus value.
-     *bottom = os::Linux::initial_thread_stack_bottom();
-     *size   = os::Linux::initial_thread_stack_size();
-   } else {
-     pthread_attr_t attr;
- 
-     int rslt = pthread_getattr_np(pthread_self(), &attr);
- 
-     // JVM needs to know exact stack location, abort if it fails
-     if (rslt != 0) {
-       if (rslt == ENOMEM) {
-         vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "pthread_getattr_np");
-       } else {
-         fatal("pthread_getattr_np failed with errno = %d", rslt);
-       }
-     }
- 
-     if (pthread_attr_getstack(&attr, (void **)bottom, size) != 0) {
-       fatal("Can not locate current stack attributes!");
-     }
- 
-     pthread_attr_destroy(&attr);
- 
-   }
-   assert(os::current_stack_pointer() >= *bottom &&
-          os::current_stack_pointer() < *bottom + *size, "just checking");
- }
- 
- address os::current_stack_base() {
-   address bottom;
-   size_t size;
-   current_stack_region(&bottom, &size);
-   return (bottom + size);
- }
- 
- size_t os::current_stack_size() {
-   // stack size includes normal stack and HotSpot guard pages
-   address bottom;
-   size_t size;
-   current_stack_region(&bottom, &size);
-   return size;
- }
- 
  /////////////////////////////////////////////////////////////////////////////
  // helper functions for fatal error handler
  
  void os::print_context(outputStream *st, const void *context) {
    if (context == NULL) return;
--- 471,493 ----
  }
  
  ////////////////////////////////////////////////////////////////////////////////
  // thread stack
  
+ // These sizes exclude libc stack guard pages, but include
+ // the HotSpot guard pages.
  size_t os::Posix::_compiler_thread_min_stack_allowed = 128 * K;
! size_t os::Posix::_java_thread_min_stack_allowed = 236 * K;
  size_t os::Posix::_vm_internal_thread_min_stack_allowed = 128 * K;
  
! // Return default stack size for thr_type.
  size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
!   // Default stack size (compiler thread needs larger stack).
    size_t s = (thr_type == os::compiler_thread ? 4 * M : 1024 * K);
    return s;
  }
  
  /////////////////////////////////////////////////////////////////////////////
  // helper functions for fatal error handler
  
  void os::print_context(outputStream *st, const void *context) {
    if (context == NULL) return;