author | pliden |
Wed, 13 May 2015 15:16:06 +0200 | |
changeset 30764 | fec48bf5a827 |
parent 30291 | hotspot/src/share/vm/gc_implementation/parallelScavenge/psVirtualspace.cpp@54cdc5c1a9cb |
child 35061 | be6025ebffea |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 2003, 2015, 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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||
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#include "precompiled.hpp" |
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#include "gc/parallel/psVirtualspace.hpp" |
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#include "memory/virtualspace.hpp" |
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#include "runtime/os.hpp" |
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// PSVirtualSpace |
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PSVirtualSpace::PSVirtualSpace(ReservedSpace rs, size_t alignment) : |
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_alignment(alignment) |
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{ |
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set_reserved(rs); |
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set_committed(reserved_low_addr(), reserved_low_addr()); |
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DEBUG_ONLY(verify()); |
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} |
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PSVirtualSpace::PSVirtualSpace(ReservedSpace rs) : |
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_alignment(os::vm_page_size()) |
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{ |
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set_reserved(rs); |
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set_committed(reserved_low_addr(), reserved_low_addr()); |
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DEBUG_ONLY(verify()); |
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} |
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// Deprecated. |
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PSVirtualSpace::PSVirtualSpace(): _alignment(os::vm_page_size()) { |
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} |
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// Deprecated. |
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bool PSVirtualSpace::initialize(ReservedSpace rs, |
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size_t commit_size) { |
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set_reserved(rs); |
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set_committed(reserved_low_addr(), reserved_low_addr()); |
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// Commit to initial size. |
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assert(commit_size <= rs.size(), "commit_size too big"); |
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bool result = commit_size > 0 ? expand_by(commit_size) : true; |
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DEBUG_ONLY(verify()); |
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return result; |
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} |
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PSVirtualSpace::~PSVirtualSpace() { |
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release(); |
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} |
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bool PSVirtualSpace::contains(void* p) const { |
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char* const cp = (char*)p; |
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return cp >= committed_low_addr() && cp < committed_high_addr(); |
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} |
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void PSVirtualSpace::release() { |
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DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); |
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// This may not release memory it didn't reserve. |
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// Use rs.release() to release the underlying memory instead. |
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_reserved_low_addr = _reserved_high_addr = NULL; |
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_committed_low_addr = _committed_high_addr = NULL; |
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_special = false; |
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} |
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bool PSVirtualSpace::expand_by(size_t bytes) { |
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assert(is_aligned(bytes), "arg not aligned"); |
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DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); |
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if (uncommitted_size() < bytes) { |
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return false; |
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} |
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char* const base_addr = committed_high_addr(); |
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bool result = special() || |
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os::commit_memory(base_addr, bytes, alignment(), !ExecMem); |
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if (result) { |
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_committed_high_addr += bytes; |
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} |
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return result; |
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} |
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bool PSVirtualSpace::shrink_by(size_t bytes) { |
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assert(is_aligned(bytes), "arg not aligned"); |
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DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); |
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if (committed_size() < bytes) { |
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return false; |
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} |
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char* const base_addr = committed_high_addr() - bytes; |
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bool result = special() || os::uncommit_memory(base_addr, bytes); |
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if (result) { |
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_committed_high_addr -= bytes; |
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} |
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return result; |
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} |
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size_t |
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PSVirtualSpace::expand_into(PSVirtualSpace* other_space, size_t bytes) { |
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assert(is_aligned(bytes), "arg not aligned"); |
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assert(grows_up(), "this space must grow up"); |
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assert(other_space->grows_down(), "other space must grow down"); |
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assert(reserved_high_addr() == other_space->reserved_low_addr(), |
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"spaces not contiguous"); |
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assert(special() == other_space->special(), "one space is special, the other is not"); |
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DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); |
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DEBUG_ONLY(PSVirtualSpaceVerifier other_verifier(other_space)); |
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size_t bytes_needed = bytes; |
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// First use the uncommitted region in this space. |
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size_t tmp_bytes = MIN2(uncommitted_size(), bytes_needed); |
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if (tmp_bytes > 0) { |
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if (expand_by(tmp_bytes)) { |
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bytes_needed -= tmp_bytes; |
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} else { |
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return 0; |
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} |
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} |
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// Next take from the uncommitted region in the other space, and commit it. |
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tmp_bytes = MIN2(other_space->uncommitted_size(), bytes_needed); |
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if (tmp_bytes > 0) { |
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char* const commit_base = committed_high_addr(); |
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if (other_space->special() || |
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os::commit_memory(commit_base, tmp_bytes, alignment(), !ExecMem)) { |
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// Reduce the reserved region in the other space. |
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other_space->set_reserved(other_space->reserved_low_addr() + tmp_bytes, |
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other_space->reserved_high_addr(), |
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other_space->special()); |
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// Grow both reserved and committed in this space. |
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_reserved_high_addr += tmp_bytes; |
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_committed_high_addr += tmp_bytes; |
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bytes_needed -= tmp_bytes; |
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} else { |
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return bytes - bytes_needed; |
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} |
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} |
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// Finally take from the already committed region in the other space. |
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tmp_bytes = bytes_needed; |
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if (tmp_bytes > 0) { |
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// Reduce both committed and reserved in the other space. |
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other_space->set_committed(other_space->committed_low_addr() + tmp_bytes, |
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other_space->committed_high_addr()); |
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other_space->set_reserved(other_space->reserved_low_addr() + tmp_bytes, |
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other_space->reserved_high_addr(), |
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other_space->special()); |
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// Grow both reserved and committed in this space. |
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_reserved_high_addr += tmp_bytes; |
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_committed_high_addr += tmp_bytes; |
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} |
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return bytes; |
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} |
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#ifndef PRODUCT |
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bool PSVirtualSpace::is_aligned(size_t value, size_t align) { |
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const size_t tmp_value = value + align - 1; |
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const size_t mask = ~(align - 1); |
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return (tmp_value & mask) == value; |
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} |
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bool PSVirtualSpace::is_aligned(size_t value) const { |
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return is_aligned(value, alignment()); |
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} |
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bool PSVirtualSpace::is_aligned(char* value) const { |
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return is_aligned((size_t)value); |
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} |
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void PSVirtualSpace::verify() const { |
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assert(is_aligned(alignment(), os::vm_page_size()), "bad alignment"); |
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assert(is_aligned(reserved_low_addr()), "bad reserved_low_addr"); |
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assert(is_aligned(reserved_high_addr()), "bad reserved_high_addr"); |
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assert(is_aligned(committed_low_addr()), "bad committed_low_addr"); |
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assert(is_aligned(committed_high_addr()), "bad committed_high_addr"); |
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// Reserved region must be non-empty or both addrs must be 0. |
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assert(reserved_low_addr() < reserved_high_addr() || |
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reserved_low_addr() == NULL && reserved_high_addr() == NULL, |
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"bad reserved addrs"); |
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assert(committed_low_addr() <= committed_high_addr(), "bad committed addrs"); |
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if (grows_up()) { |
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assert(reserved_low_addr() == committed_low_addr(), "bad low addrs"); |
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assert(reserved_high_addr() >= committed_high_addr(), "bad high addrs"); |
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} else { |
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assert(reserved_high_addr() == committed_high_addr(), "bad high addrs"); |
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assert(reserved_low_addr() <= committed_low_addr(), "bad low addrs"); |
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} |
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} |
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void PSVirtualSpace::print() const { |
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gclog_or_tty->print_cr("virtual space [" PTR_FORMAT "]: alignment=" |
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SIZE_FORMAT "K grows %s%s", |
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p2i(this), alignment() / K, grows_up() ? "up" : "down", |
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special() ? " (pinned in memory)" : ""); |
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gclog_or_tty->print_cr(" reserved=" SIZE_FORMAT "K" |
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" [" PTR_FORMAT "," PTR_FORMAT "]" |
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" committed=" SIZE_FORMAT "K" |
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" [" PTR_FORMAT "," PTR_FORMAT "]", |
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reserved_size() / K, |
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p2i(reserved_low_addr()), p2i(reserved_high_addr()), |
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committed_size() / K, |
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p2i(committed_low_addr()), p2i(committed_high_addr())); |
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} |
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#endif // #ifndef PRODUCT |
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void PSVirtualSpace::print_space_boundaries_on(outputStream* st) const { |
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st->print_cr(" [" PTR_FORMAT ", " PTR_FORMAT ", " PTR_FORMAT ")", |
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p2i(low_boundary()), p2i(high()), p2i(high_boundary())); |
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} |
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PSVirtualSpaceHighToLow::PSVirtualSpaceHighToLow(ReservedSpace rs, |
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size_t alignment) : |
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PSVirtualSpace(alignment) |
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{ |
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set_reserved(rs); |
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set_committed(reserved_high_addr(), reserved_high_addr()); |
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DEBUG_ONLY(verify()); |
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} |
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PSVirtualSpaceHighToLow::PSVirtualSpaceHighToLow(ReservedSpace rs) { |
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set_reserved(rs); |
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set_committed(reserved_high_addr(), reserved_high_addr()); |
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DEBUG_ONLY(verify()); |
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} |
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bool PSVirtualSpaceHighToLow::expand_by(size_t bytes) { |
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assert(is_aligned(bytes), "arg not aligned"); |
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DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); |
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if (uncommitted_size() < bytes) { |
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return false; |
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} |
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char* const base_addr = committed_low_addr() - bytes; |
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bool result = special() || |
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os::commit_memory(base_addr, bytes, alignment(), !ExecMem); |
1 | 263 |
if (result) { |
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_committed_low_addr -= bytes; |
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} |
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return result; |
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} |
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bool PSVirtualSpaceHighToLow::shrink_by(size_t bytes) { |
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assert(is_aligned(bytes), "arg not aligned"); |
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DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); |
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if (committed_size() < bytes) { |
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return false; |
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} |
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char* const base_addr = committed_low_addr(); |
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bool result = special() || os::uncommit_memory(base_addr, bytes); |
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if (result) { |
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_committed_low_addr += bytes; |
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} |
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return result; |
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} |
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size_t PSVirtualSpaceHighToLow::expand_into(PSVirtualSpace* other_space, |
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size_t bytes) { |
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assert(is_aligned(bytes), "arg not aligned"); |
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assert(grows_down(), "this space must grow down"); |
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assert(other_space->grows_up(), "other space must grow up"); |
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assert(reserved_low_addr() == other_space->reserved_high_addr(), |
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"spaces not contiguous"); |
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assert(special() == other_space->special(), "one space is special in memory, the other is not"); |
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DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); |
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DEBUG_ONLY(PSVirtualSpaceVerifier other_verifier(other_space)); |
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size_t bytes_needed = bytes; |
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// First use the uncommitted region in this space. |
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size_t tmp_bytes = MIN2(uncommitted_size(), bytes_needed); |
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if (tmp_bytes > 0) { |
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if (expand_by(tmp_bytes)) { |
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bytes_needed -= tmp_bytes; |
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} else { |
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return 0; |
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} |
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} |
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// Next take from the uncommitted region in the other space, and commit it. |
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tmp_bytes = MIN2(other_space->uncommitted_size(), bytes_needed); |
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312 |
if (tmp_bytes > 0) { |
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char* const commit_base = committed_low_addr() - tmp_bytes; |
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if (other_space->special() || |
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os::commit_memory(commit_base, tmp_bytes, alignment(), !ExecMem)) { |
1 | 316 |
// Reduce the reserved region in the other space. |
317 |
other_space->set_reserved(other_space->reserved_low_addr(), |
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other_space->reserved_high_addr() - tmp_bytes, |
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other_space->special()); |
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// Grow both reserved and committed in this space. |
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_reserved_low_addr -= tmp_bytes; |
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323 |
_committed_low_addr -= tmp_bytes; |
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324 |
bytes_needed -= tmp_bytes; |
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325 |
} else { |
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return bytes - bytes_needed; |
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327 |
} |
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328 |
} |
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329 |
||
330 |
// Finally take from the already committed region in the other space. |
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331 |
tmp_bytes = bytes_needed; |
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332 |
if (tmp_bytes > 0) { |
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333 |
// Reduce both committed and reserved in the other space. |
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334 |
other_space->set_committed(other_space->committed_low_addr(), |
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335 |
other_space->committed_high_addr() - tmp_bytes); |
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336 |
other_space->set_reserved(other_space->reserved_low_addr(), |
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other_space->reserved_high_addr() - tmp_bytes, |
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338 |
other_space->special()); |
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339 |
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340 |
// Grow both reserved and committed in this space. |
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341 |
_reserved_low_addr -= tmp_bytes; |
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342 |
_committed_low_addr -= tmp_bytes; |
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343 |
} |
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345 |
return bytes; |
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346 |
} |
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348 |
void |
|
349 |
PSVirtualSpaceHighToLow::print_space_boundaries_on(outputStream* st) const { |
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350 |
st->print_cr(" (" PTR_FORMAT ", " PTR_FORMAT ", " PTR_FORMAT "]", |
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p2i(high_boundary()), p2i(low()), p2i(low_boundary())); |
1 | 352 |
} |