296 size_t os::Linux::default_stack_size(os::ThreadType thr_type) {
 297 #ifdef _LP64
 298   size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M);
 299 #else
 300   size_t s = (thr_type == os::compiler_thread ? 2 * M : 512 * K);
 301 #endif // _LP64
 302   return s;
 303 }
 304 
 305 size_t os::Linux::default_guard_size(os::ThreadType thr_type) {
 306   // Only enable glibc guard pages for non-Java threads
 307   // (Java threads have HotSpot guard pages)
 308   return (thr_type == java_thread ? 0 : page_size());
 309 }
 310 
 311 static void current_stack_region(address *bottom, size_t *size) {
 312   pthread_attr_t attr;
 313   int res = pthread_getattr_np(pthread_self(), &attr);
 314   if (res != 0) {
 315     if (res == ENOMEM) {
 316       vm_exit_out_of_memory(0, "pthread_getattr_np");
 317     }
 318     else {
 319       fatal(err_msg("pthread_getattr_np failed with errno = %d", res));
 320     }
 321   }
 322 
 323   address stack_bottom;
 324   size_t stack_bytes;
 325   res = pthread_attr_getstack(&attr, (void **) &stack_bottom, &stack_bytes);
 326   if (res != 0) {
 327     fatal(err_msg("pthread_attr_getstack failed with errno = %d", res));
 328   }
 329   address stack_top = stack_bottom + stack_bytes;
 330 
 331   // The block of memory returned by pthread_attr_getstack() includes
 332   // guard pages where present.  We need to trim these off.
 333   size_t page_bytes = os::Linux::page_size();
 334   assert(((intptr_t) stack_bottom & (page_bytes - 1)) == 0, "unaligned stack");
 335 
 336   size_t guard_bytes;

 296 size_t os::Linux::default_stack_size(os::ThreadType thr_type) {
 297 #ifdef _LP64
 298   size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M);
 299 #else
 300   size_t s = (thr_type == os::compiler_thread ? 2 * M : 512 * K);
 301 #endif // _LP64
 302   return s;
 303 }
 304 
 305 size_t os::Linux::default_guard_size(os::ThreadType thr_type) {
 306   // Only enable glibc guard pages for non-Java threads
 307   // (Java threads have HotSpot guard pages)
 308   return (thr_type == java_thread ? 0 : page_size());
 309 }
 310 
 311 static void current_stack_region(address *bottom, size_t *size) {
 312   pthread_attr_t attr;
 313   int res = pthread_getattr_np(pthread_self(), &attr);
 314   if (res != 0) {
 315     if (res == ENOMEM) {
 316       vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "pthread_getattr_np");
 317     }
 318     else {
 319       fatal(err_msg("pthread_getattr_np failed with errno = %d", res));
 320     }
 321   }
 322 
 323   address stack_bottom;
 324   size_t stack_bytes;
 325   res = pthread_attr_getstack(&attr, (void **) &stack_bottom, &stack_bytes);
 326   if (res != 0) {
 327     fatal(err_msg("pthread_attr_getstack failed with errno = %d", res));
 328   }
 329   address stack_top = stack_bottom + stack_bytes;
 330 
 331   // The block of memory returned by pthread_attr_getstack() includes
 332   // guard pages where present.  We need to trim these off.
 333   size_t page_bytes = os::Linux::page_size();
 334   assert(((intptr_t) stack_bottom & (page_bytes - 1)) == 0, "unaligned stack");
 335 
 336   size_t guard_bytes;