Mercurial > hg > graal-compiler
view src/share/vm/utilities/bitMap.inline.hpp @ 2149:7e37af9d69ef
7011379: G1: overly long concurrent marking cycles
Summary: This changeset introduces filtering of SATB buffers at the point when they are about to be enqueued. If this filtering clears enough entries on each buffer, the buffer can then be re-used and not enqueued. This cuts down the number of SATB buffers that need to be processed by the concurrent marking threads.
Reviewed-by: johnc, ysr
author | tonyp |
---|---|
date | Wed, 19 Jan 2011 09:35:17 -0500 |
parents | f95d63e2154a |
children | 2e966d967c5c |
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/* * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_UTILITIES_BITMAP_INLINE_HPP #define SHARE_VM_UTILITIES_BITMAP_INLINE_HPP #include "runtime/atomic.hpp" #include "utilities/bitMap.hpp" #ifdef ASSERT inline void BitMap::verify_index(idx_t index) const { assert(index < _size, "BitMap index out of bounds"); } inline void BitMap::verify_range(idx_t beg_index, idx_t end_index) const { assert(beg_index <= end_index, "BitMap range error"); // Note that [0,0) and [size,size) are both valid ranges. if (end_index != _size) verify_index(end_index); } #endif // #ifdef ASSERT inline void BitMap::set_bit(idx_t bit) { verify_index(bit); *word_addr(bit) |= bit_mask(bit); } inline void BitMap::clear_bit(idx_t bit) { verify_index(bit); *word_addr(bit) &= ~bit_mask(bit); } inline bool BitMap::par_set_bit(idx_t bit) { verify_index(bit); volatile idx_t* const addr = word_addr(bit); const idx_t mask = bit_mask(bit); idx_t old_val = *addr; do { const idx_t new_val = old_val | mask; if (new_val == old_val) { return false; // Someone else beat us to it. } const idx_t cur_val = (idx_t) Atomic::cmpxchg_ptr((void*) new_val, (volatile void*) addr, (void*) old_val); if (cur_val == old_val) { return true; // Success. } old_val = cur_val; // The value changed, try again. } while (true); } inline bool BitMap::par_clear_bit(idx_t bit) { verify_index(bit); volatile idx_t* const addr = word_addr(bit); const idx_t mask = ~bit_mask(bit); idx_t old_val = *addr; do { const idx_t new_val = old_val & mask; if (new_val == old_val) { return false; // Someone else beat us to it. } const idx_t cur_val = (idx_t) Atomic::cmpxchg_ptr((void*) new_val, (volatile void*) addr, (void*) old_val); if (cur_val == old_val) { return true; // Success. } old_val = cur_val; // The value changed, try again. } while (true); } inline void BitMap::set_range(idx_t beg, idx_t end, RangeSizeHint hint) { if (hint == small_range && end - beg == 1) { set_bit(beg); } else { if (hint == large_range) { set_large_range(beg, end); } else { set_range(beg, end); } } } inline void BitMap::clear_range(idx_t beg, idx_t end, RangeSizeHint hint) { if (hint == small_range && end - beg == 1) { clear_bit(beg); } else { if (hint == large_range) { clear_large_range(beg, end); } else { clear_range(beg, end); } } } inline void BitMap::par_set_range(idx_t beg, idx_t end, RangeSizeHint hint) { if (hint == small_range && end - beg == 1) { par_at_put(beg, true); } else { if (hint == large_range) { par_at_put_large_range(beg, end, true); } else { par_at_put_range(beg, end, true); } } } inline void BitMap::set_range_of_words(idx_t beg, idx_t end) { bm_word_t* map = _map; for (idx_t i = beg; i < end; ++i) map[i] = ~(uintptr_t)0; } inline void BitMap::clear_range_of_words(idx_t beg, idx_t end) { bm_word_t* map = _map; for (idx_t i = beg; i < end; ++i) map[i] = 0; } inline void BitMap::clear() { clear_range_of_words(0, size_in_words()); } inline void BitMap::par_clear_range(idx_t beg, idx_t end, RangeSizeHint hint) { if (hint == small_range && end - beg == 1) { par_at_put(beg, false); } else { if (hint == large_range) { par_at_put_large_range(beg, end, false); } else { par_at_put_range(beg, end, false); } } } inline BitMap::idx_t BitMap::get_next_one_offset_inline(idx_t l_offset, idx_t r_offset) const { assert(l_offset <= size(), "BitMap index out of bounds"); assert(r_offset <= size(), "BitMap index out of bounds"); assert(l_offset <= r_offset, "l_offset > r_offset ?"); if (l_offset == r_offset) { return l_offset; } idx_t index = word_index(l_offset); idx_t r_index = word_index(r_offset-1) + 1; idx_t res_offset = l_offset; // check bits including and to the _left_ of offset's position idx_t pos = bit_in_word(res_offset); idx_t res = map(index) >> pos; if (res != (uintptr_t)NoBits) { // find the position of the 1-bit for (; !(res & 1); res_offset++) { res = res >> 1; } assert(res_offset >= l_offset && res_offset < r_offset, "just checking"); return MIN2(res_offset, r_offset); } // skip over all word length 0-bit runs for (index++; index < r_index; index++) { res = map(index); if (res != (uintptr_t)NoBits) { // found a 1, return the offset for (res_offset = bit_index(index); !(res & 1); res_offset++) { res = res >> 1; } assert(res & 1, "tautology; see loop condition"); assert(res_offset >= l_offset, "just checking"); return MIN2(res_offset, r_offset); } } return r_offset; } inline BitMap::idx_t BitMap::get_next_zero_offset_inline(idx_t l_offset, idx_t r_offset) const { assert(l_offset <= size(), "BitMap index out of bounds"); assert(r_offset <= size(), "BitMap index out of bounds"); assert(l_offset <= r_offset, "l_offset > r_offset ?"); if (l_offset == r_offset) { return l_offset; } idx_t index = word_index(l_offset); idx_t r_index = word_index(r_offset-1) + 1; idx_t res_offset = l_offset; // check bits including and to the _left_ of offset's position idx_t pos = res_offset & (BitsPerWord - 1); idx_t res = (map(index) >> pos) | left_n_bits((int)pos); if (res != (uintptr_t)AllBits) { // find the position of the 0-bit for (; res & 1; res_offset++) { res = res >> 1; } assert(res_offset >= l_offset, "just checking"); return MIN2(res_offset, r_offset); } // skip over all word length 1-bit runs for (index++; index < r_index; index++) { res = map(index); if (res != (uintptr_t)AllBits) { // found a 0, return the offset for (res_offset = index << LogBitsPerWord; res & 1; res_offset++) { res = res >> 1; } assert(!(res & 1), "tautology; see loop condition"); assert(res_offset >= l_offset, "just checking"); return MIN2(res_offset, r_offset); } } return r_offset; } inline BitMap::idx_t BitMap::get_next_one_offset_inline_aligned_right(idx_t l_offset, idx_t r_offset) const { verify_range(l_offset, r_offset); assert(bit_in_word(r_offset) == 0, "r_offset not word-aligned"); if (l_offset == r_offset) { return l_offset; } idx_t index = word_index(l_offset); idx_t r_index = word_index(r_offset); idx_t res_offset = l_offset; // check bits including and to the _left_ of offset's position idx_t res = map(index) >> bit_in_word(res_offset); if (res != (uintptr_t)NoBits) { // find the position of the 1-bit for (; !(res & 1); res_offset++) { res = res >> 1; } assert(res_offset >= l_offset && res_offset < r_offset, "just checking"); return res_offset; } // skip over all word length 0-bit runs for (index++; index < r_index; index++) { res = map(index); if (res != (uintptr_t)NoBits) { // found a 1, return the offset for (res_offset = bit_index(index); !(res & 1); res_offset++) { res = res >> 1; } assert(res & 1, "tautology; see loop condition"); assert(res_offset >= l_offset && res_offset < r_offset, "just checking"); return res_offset; } } return r_offset; } // Returns a bit mask for a range of bits [beg, end) within a single word. Each // bit in the mask is 0 if the bit is in the range, 1 if not in the range. The // returned mask can be used directly to clear the range, or inverted to set the // range. Note: end must not be 0. inline BitMap::bm_word_t BitMap::inverted_bit_mask_for_range(idx_t beg, idx_t end) const { assert(end != 0, "does not work when end == 0"); assert(beg == end || word_index(beg) == word_index(end - 1), "must be a single-word range"); bm_word_t mask = bit_mask(beg) - 1; // low (right) bits if (bit_in_word(end) != 0) { mask |= ~(bit_mask(end) - 1); // high (left) bits } return mask; } inline void BitMap::set_large_range_of_words(idx_t beg, idx_t end) { memset(_map + beg, ~(unsigned char)0, (end - beg) * sizeof(uintptr_t)); } inline void BitMap::clear_large_range_of_words(idx_t beg, idx_t end) { memset(_map + beg, 0, (end - beg) * sizeof(uintptr_t)); } inline BitMap::idx_t BitMap::word_index_round_up(idx_t bit) const { idx_t bit_rounded_up = bit + (BitsPerWord - 1); // Check for integer arithmetic overflow. return bit_rounded_up > bit ? word_index(bit_rounded_up) : size_in_words(); } inline BitMap::idx_t BitMap::get_next_one_offset(idx_t l_offset, idx_t r_offset) const { return get_next_one_offset_inline(l_offset, r_offset); } inline BitMap::idx_t BitMap::get_next_zero_offset(idx_t l_offset, idx_t r_offset) const { return get_next_zero_offset_inline(l_offset, r_offset); } inline void BitMap2D::clear() { _map.clear(); } #endif // SHARE_VM_UTILITIES_BITMAP_INLINE_HPP