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comparison src/os/linux/vm/os_linux.cpp @ 1750:c7004d700b49

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6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths Summary: Disable stack bounds checks in product mode other than for the initial thread Reviewed-by: coleenp, jcoomes, aph
author dholmes
date Wed, 25 Aug 2010 21:29:05 -0400
parents 126ea7725993
children 1c352af0135d
comparison
equal deleted inserted replaced
1745:ebfb7c68865e 1750:c7004d700b49
2595 2595
2596 // If the (growable) stack mapping already extends beyond the point 2596 // If the (growable) stack mapping already extends beyond the point
2597 // where we're going to put our guard pages, truncate the mapping at 2597 // where we're going to put our guard pages, truncate the mapping at
2598 // that point by munmap()ping it. This ensures that when we later 2598 // that point by munmap()ping it. This ensures that when we later
2599 // munmap() the guard pages we don't leave a hole in the stack 2599 // munmap() the guard pages we don't leave a hole in the stack
2600 // mapping. 2600 // mapping. This only affects the main/initial thread, but guard
2601 // against future OS changes
2601 bool os::create_stack_guard_pages(char* addr, size_t size) { 2602 bool os::create_stack_guard_pages(char* addr, size_t size) {
2602 uintptr_t stack_extent, stack_base; 2603 uintptr_t stack_extent, stack_base;
2603 if (get_stack_bounds(&stack_extent, &stack_base)) { 2604 bool chk_bounds = NOT_DEBUG(os::Linux::is_initial_thread()) DEBUG_ONLY(true);
2605 if (chk_bounds && get_stack_bounds(&stack_extent, &stack_base)) {
2606 assert(os::Linux::is_initial_thread(),
2607 "growable stack in non-initial thread");
2604 if (stack_extent < (uintptr_t)addr) 2608 if (stack_extent < (uintptr_t)addr)
2605 ::munmap((void*)stack_extent, (uintptr_t)addr - stack_extent); 2609 ::munmap((void*)stack_extent, (uintptr_t)addr - stack_extent);
2606 } 2610 }
2607 2611
2608 return os::commit_memory(addr, size); 2612 return os::commit_memory(addr, size);
2609 } 2613 }
2610 2614
2611 // If this is a growable mapping, remove the guard pages entirely by 2615 // If this is a growable mapping, remove the guard pages entirely by
2612 // munmap()ping them. If not, just call uncommit_memory(). 2616 // munmap()ping them. If not, just call uncommit_memory(). This only
2617 // affects the main/initial thread, but guard against future OS changes
2613 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2618 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2614 uintptr_t stack_extent, stack_base; 2619 uintptr_t stack_extent, stack_base;
2615 if (get_stack_bounds(&stack_extent, &stack_base)) { 2620 bool chk_bounds = NOT_DEBUG(os::Linux::is_initial_thread()) DEBUG_ONLY(true);
2621 if (chk_bounds && get_stack_bounds(&stack_extent, &stack_base)) {
2622 assert(os::Linux::is_initial_thread(),
2623 "growable stack in non-initial thread");
2624
2616 return ::munmap(addr, size) == 0; 2625 return ::munmap(addr, size) == 0;
2617 } 2626 }
2618 2627
2619 return os::uncommit_memory(addr, size); 2628 return os::uncommit_memory(addr, size);
2620 } 2629 }