author | pliden |
Tue, 12 Jun 2018 17:40:28 +0200 | |
changeset 50525 | 767cdb97f103 |
child 51346 | d98f2adf09c9 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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|
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#include "precompiled.hpp" |
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#include "gc/z/zErrno.hpp" |
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#include "gc/z/zGlobals.hpp" |
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#include "gc/z/zLock.inline.hpp" |
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#include "gc/z/zMarkStack.inline.hpp" |
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#include "logging/log.hpp" |
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#include "runtime/atomic.hpp" |
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#include "utilities/debug.hpp" |
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#include <sys/mman.h> |
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#include <sys/types.h> |
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ZMarkStackSpace::ZMarkStackSpace() : |
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_expand_lock(), |
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_top(0), |
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_end(0) { |
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assert(ZMarkStacksMax >= ZMarkStackSpaceExpandSize, "ZMarkStacksMax too small"); |
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assert(ZMarkStacksMax <= ZMarkStackSpaceSize, "ZMarkStacksMax too large"); |
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// Reserve address space |
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const void* res = mmap((void*)ZMarkStackSpaceStart, ZMarkStackSpaceSize, |
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PROT_NONE, MAP_ANONYMOUS|MAP_PRIVATE|MAP_NORESERVE, -1, 0); |
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if (res != (void*)ZMarkStackSpaceStart) { |
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log_error(gc, marking)("Failed to reserve address space for marking stacks"); |
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return; |
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} |
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// Successfully initialized |
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_top = _end = ZMarkStackSpaceStart; |
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} |
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bool ZMarkStackSpace::is_initialized() const { |
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return _top != 0; |
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} |
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bool ZMarkStackSpace::expand() { |
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const size_t max = ZMarkStackSpaceStart + ZMarkStacksMax; |
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if (_end + ZMarkStackSpaceExpandSize > max) { |
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// Expansion limit reached |
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return false; |
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} |
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void* const res = mmap((void*)_end, ZMarkStackSpaceExpandSize, |
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PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE|MAP_FIXED, -1, 0); |
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if (res == MAP_FAILED) { |
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ZErrno err; |
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log_error(gc, marking)("Failed to map memory for marking stacks (%s)", err.to_string()); |
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return false; |
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} |
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return true; |
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} |
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uintptr_t ZMarkStackSpace::alloc_space(size_t size) { |
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uintptr_t top = _top; |
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|
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for (;;) { |
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const uintptr_t new_top = top + size; |
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if (new_top > _end) { |
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// Not enough space left |
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return 0; |
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} |
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const uintptr_t prev_top = Atomic::cmpxchg(new_top, &_top, top); |
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if (prev_top == top) { |
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// Success |
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return top; |
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} |
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// Retry |
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top = prev_top; |
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} |
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} |
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uintptr_t ZMarkStackSpace::expand_and_alloc_space(size_t size) { |
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ZLocker locker(&_expand_lock); |
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// Retry allocation before expanding |
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uintptr_t addr = alloc_space(size); |
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if (addr != 0) { |
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return addr; |
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} |
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// Expand stack space |
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if (!expand()) { |
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// We currently can't handle the situation where we |
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// are running out of mark stack space. |
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fatal("Mark stack overflow (allocated " SIZE_FORMAT "M, size " SIZE_FORMAT "M, max " SIZE_FORMAT "M)," |
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" use -XX:ZMarkStacksMax=? to increase this limit", |
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(_end - ZMarkStackSpaceStart) / M, size / M, ZMarkStacksMax / M); |
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return 0; |
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} |
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|
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log_debug(gc, marking)("Expanding mark stack space: " SIZE_FORMAT "M->" SIZE_FORMAT "M", |
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(_end - ZMarkStackSpaceStart) / M, |
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(_end - ZMarkStackSpaceStart + ZMarkStackSpaceExpandSize) / M); |
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|
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// Increment top before end to make sure another |
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// thread can't steal out newly expanded space. |
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addr = Atomic::add(size, &_top) - size; |
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_end += ZMarkStackSpaceExpandSize; |
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|
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return addr; |
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} |
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|
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uintptr_t ZMarkStackSpace::alloc(size_t size) { |
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const uintptr_t addr = alloc_space(size); |
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if (addr != 0) { |
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return addr; |
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} |
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|
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return expand_and_alloc_space(size); |
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} |
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|
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ZMarkStackAllocator::ZMarkStackAllocator() : |
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_freelist(), |
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_space() { |
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guarantee(sizeof(ZMarkStack) == ZMarkStackSize, "Size mismatch"); |
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guarantee(sizeof(ZMarkStackMagazine) <= ZMarkStackSize, "Size mismatch"); |
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|
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// Prime free list to avoid an immediate space |
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// expansion when marking starts. |
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if (_space.is_initialized()) { |
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prime_freelist(); |
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} |
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} |
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|
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bool ZMarkStackAllocator::is_initialized() const { |
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return _space.is_initialized(); |
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} |
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|
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void ZMarkStackAllocator::prime_freelist() { |
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for (size_t size = 0; size < ZMarkStackSpaceExpandSize; size += ZMarkStackMagazineSize) { |
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const uintptr_t addr = _space.alloc(ZMarkStackMagazineSize); |
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ZMarkStackMagazine* const magazine = create_magazine_from_space(addr, ZMarkStackMagazineSize); |
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free_magazine(magazine); |
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} |
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} |
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|
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ZMarkStackMagazine* ZMarkStackAllocator::create_magazine_from_space(uintptr_t addr, size_t size) { |
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assert(is_aligned(size, ZMarkStackSize), "Invalid size"); |
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|
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// Use first stack as magazine |
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ZMarkStackMagazine* const magazine = new ((void*)addr) ZMarkStackMagazine(); |
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for (size_t i = ZMarkStackSize; i < size; i += ZMarkStackSize) { |
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ZMarkStack* const stack = new ((void*)(addr + i)) ZMarkStack(); |
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const bool success = magazine->push(stack); |
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assert(success, "Magazine should never get full"); |
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} |
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|
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return magazine; |
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} |
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|
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ZMarkStackMagazine* ZMarkStackAllocator::alloc_magazine() { |
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// Try allocating from the free list first |
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ZMarkStackMagazine* const magazine = _freelist.pop_atomic(); |
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if (magazine != NULL) { |
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return magazine; |
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} |
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|
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// Allocate new magazine |
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const uintptr_t addr = _space.alloc(ZMarkStackMagazineSize); |
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if (addr == 0) { |
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return NULL; |
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} |
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|
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return create_magazine_from_space(addr, ZMarkStackMagazineSize); |
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} |
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|
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void ZMarkStackAllocator::free_magazine(ZMarkStackMagazine* magazine) { |
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_freelist.push_atomic(magazine); |
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} |
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|
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ZMarkStripe::ZMarkStripe() : |
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_published(), |
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_overflowed() {} |
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|
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ZMarkStripeSet::ZMarkStripeSet() : |
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_nstripes(0), |
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_nstripes_mask(0), |
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_stripes() {} |
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|
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void ZMarkStripeSet::set_nstripes(size_t nstripes) { |
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assert(is_power_of_2(nstripes), "Must be a power of two"); |
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assert(is_power_of_2(ZMarkStripesMax), "Must be a power of two"); |
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assert(nstripes >= 1, "Invalid number of stripes"); |
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assert(nstripes <= ZMarkStripesMax, "Invalid number of stripes"); |
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|
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_nstripes = nstripes; |
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_nstripes_mask = nstripes - 1; |
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|
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log_debug(gc, marking)("Using " SIZE_FORMAT " mark stripes", _nstripes); |
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} |
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|
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bool ZMarkStripeSet::is_empty() const { |
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for (size_t i = 0; i < _nstripes; i++) { |
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if (!_stripes[i].is_empty()) { |
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return false; |
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} |
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} |
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|
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return true; |
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} |
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|
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ZMarkStripe* ZMarkStripeSet::stripe_for_worker(uint nworkers, uint worker_id) { |
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const size_t spillover_limit = (nworkers / _nstripes) * _nstripes; |
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size_t index; |
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if (worker_id < spillover_limit) { |
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// Not a spillover worker, use natural stripe |
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index = worker_id & _nstripes_mask; |
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} else { |
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// Distribute spillover workers evenly across stripes |
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const size_t spillover_nworkers = nworkers - spillover_limit; |
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const size_t spillover_worker_id = worker_id - spillover_limit; |
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const double spillover_chunk = (double)_nstripes / (double)spillover_nworkers; |
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index = spillover_worker_id * spillover_chunk; |
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} |
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|
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assert(index < _nstripes, "Invalid index"); |
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return &_stripes[index]; |
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} |
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|
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ZMarkThreadLocalStacks::ZMarkThreadLocalStacks() : |
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_magazine(NULL) { |
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for (size_t i = 0; i < ZMarkStripesMax; i++) { |
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_stacks[i] = NULL; |
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} |
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} |
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|
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bool ZMarkThreadLocalStacks::is_empty(const ZMarkStripeSet* stripes) const { |
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for (size_t i = 0; i < stripes->nstripes(); i++) { |
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ZMarkStack* const stack = _stacks[i]; |
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if (stack != NULL) { |
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return false; |
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} |
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} |
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|
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return true; |
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} |
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|
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ZMarkStack* ZMarkThreadLocalStacks::allocate_stack(ZMarkStackAllocator* allocator) { |
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if (_magazine == NULL) { |
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// Allocate new magazine |
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_magazine = allocator->alloc_magazine(); |
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if (_magazine == NULL) { |
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return NULL; |
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} |
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} |
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|
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ZMarkStack* stack = NULL; |
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|
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if (!_magazine->pop(stack)) { |
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// Magazine is empty, convert magazine into a new stack |
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_magazine->~ZMarkStackMagazine(); |
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stack = new ((void*)_magazine) ZMarkStack(); |
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_magazine = NULL; |
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} |
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|
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return stack; |
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} |
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|
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void ZMarkThreadLocalStacks::free_stack(ZMarkStackAllocator* allocator, ZMarkStack* stack) { |
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for (;;) { |
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if (_magazine == NULL) { |
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// Convert stack into a new magazine |
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stack->~ZMarkStack(); |
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_magazine = new ((void*)stack) ZMarkStackMagazine(); |
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return; |
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} |
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|
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if (_magazine->push(stack)) { |
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// Success |
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return; |
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} |
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|
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// Free and uninstall full magazine |
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allocator->free_magazine(_magazine); |
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_magazine = NULL; |
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} |
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} |
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|
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bool ZMarkThreadLocalStacks::push_slow(ZMarkStackAllocator* allocator, |
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ZMarkStripe* stripe, |
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ZMarkStack** stackp, |
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ZMarkStackEntry entry, |
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bool publish) { |
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ZMarkStack* stack = *stackp; |
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|
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for (;;) { |
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if (stack == NULL) { |
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// Allocate and install new stack |
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*stackp = stack = allocate_stack(allocator); |
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if (stack == NULL) { |
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// Out of mark stack memory |
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return false; |
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} |
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} |
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|
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if (stack->push(entry)) { |
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// Success |
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return true; |
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} |
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|
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// Publish/Overflow and uninstall stack |
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stripe->publish_stack(stack, publish); |
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*stackp = stack = NULL; |
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} |
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} |
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333 |
|
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bool ZMarkThreadLocalStacks::pop_slow(ZMarkStackAllocator* allocator, |
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ZMarkStripe* stripe, |
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ZMarkStack** stackp, |
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ZMarkStackEntry& entry) { |
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ZMarkStack* stack = *stackp; |
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|
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for (;;) { |
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if (stack == NULL) { |
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// Try steal and install stack |
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*stackp = stack = stripe->steal_stack(); |
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if (stack == NULL) { |
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// Nothing to steal |
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return false; |
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} |
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} |
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349 |
|
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if (stack->pop(entry)) { |
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// Success |
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return true; |
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} |
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|
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// Free and uninstall stack |
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free_stack(allocator, stack); |
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*stackp = stack = NULL; |
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} |
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} |
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|
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bool ZMarkThreadLocalStacks::flush(ZMarkStackAllocator* allocator, ZMarkStripeSet* stripes) { |
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bool flushed = false; |
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|
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// Flush all stacks |
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for (size_t i = 0; i < stripes->nstripes(); i++) { |
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ZMarkStripe* const stripe = stripes->stripe_at(i); |
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ZMarkStack** const stackp = &_stacks[i]; |
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ZMarkStack* const stack = *stackp; |
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if (stack == NULL) { |
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continue; |
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} |
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|
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// Free/Publish and uninstall stack |
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if (stack->is_empty()) { |
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free_stack(allocator, stack); |
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} else { |
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stripe->publish_stack(stack); |
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flushed = true; |
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} |
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*stackp = NULL; |
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} |
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|
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return flushed; |
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} |
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385 |
|
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void ZMarkThreadLocalStacks::free(ZMarkStackAllocator* allocator) { |
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// Free and uninstall magazine |
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if (_magazine != NULL) { |
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allocator->free_magazine(_magazine); |
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_magazine = NULL; |
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391 |
} |
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} |