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
--- a/hotspot/src/os/linux/vm/os_linux.cpp Tue Apr 30 09:17:06 2013 -0400
+++ b/hotspot/src/os/linux/vm/os_linux.cpp Tue Apr 30 17:36:01 2013 -0400
@@ -119,6 +119,7 @@
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;
@@ -4250,6 +4251,15 @@
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
@@ -4303,8 +4313,8 @@
// 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)(StackYellowPages+StackRedPages+StackShadowPages) * Linux::page_size() +
+ (2*BytesPerWord COMPILER2_PRESENT(+1)) * Linux::vm_default_page_size());
size_t threadStackSizeInBytes = ThreadStackSize * K;
if (threadStackSizeInBytes != 0 &&
--- a/hotspot/src/os/linux/vm/os_linux.hpp Tue Apr 30 09:17:06 2013 -0400
+++ b/hotspot/src/os/linux/vm/os_linux.hpp Tue Apr 30 17:36:01 2013 -0400
@@ -70,6 +70,7 @@
static pthread_t _main_thread;
static Mutex* _createThread_lock;
static int _page_size;
+ static const int _vm_default_page_size;
static julong available_memory();
static julong physical_memory() { return _physical_memory; }
@@ -116,6 +117,8 @@
static int page_size(void) { return _page_size; }
static void set_page_size(int val) { _page_size = val; }
+ static int vm_default_page_size(void) { return _vm_default_page_size; }
+
static address ucontext_get_pc(ucontext_t* uc);
static intptr_t* ucontext_get_sp(ucontext_t* uc);
static intptr_t* ucontext_get_fp(ucontext_t* uc);