| /* |
| * Copyright (c) 2003, 2014, 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. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "gc_implementation/parallelScavenge/psVirtualspace.hpp" |
| #include "runtime/os.hpp" |
| #include "runtime/virtualspace.hpp" |
| #ifdef TARGET_OS_FAMILY_linux |
| # include "os_linux.inline.hpp" |
| #endif |
| #ifdef TARGET_OS_FAMILY_solaris |
| # include "os_solaris.inline.hpp" |
| #endif |
| #ifdef TARGET_OS_FAMILY_windows |
| # include "os_windows.inline.hpp" |
| #endif |
| #ifdef TARGET_OS_FAMILY_aix |
| # include "os_aix.inline.hpp" |
| #endif |
| #ifdef TARGET_OS_FAMILY_bsd |
| # include "os_bsd.inline.hpp" |
| #endif |
| |
| PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
| |
| // PSVirtualSpace |
| |
| PSVirtualSpace::PSVirtualSpace(ReservedSpace rs, size_t alignment) : |
| _alignment(alignment) |
| { |
| set_reserved(rs); |
| set_committed(reserved_low_addr(), reserved_low_addr()); |
| DEBUG_ONLY(verify()); |
| } |
| |
| PSVirtualSpace::PSVirtualSpace(ReservedSpace rs) : |
| _alignment(os::vm_page_size()) |
| { |
| set_reserved(rs); |
| set_committed(reserved_low_addr(), reserved_low_addr()); |
| DEBUG_ONLY(verify()); |
| } |
| |
| // Deprecated. |
| PSVirtualSpace::PSVirtualSpace(): _alignment(os::vm_page_size()) { |
| } |
| |
| // Deprecated. |
| bool PSVirtualSpace::initialize(ReservedSpace rs, |
| size_t commit_size) { |
| set_reserved(rs); |
| set_committed(reserved_low_addr(), reserved_low_addr()); |
| |
| // Commit to initial size. |
| assert(commit_size <= rs.size(), "commit_size too big"); |
| bool result = commit_size > 0 ? expand_by(commit_size) : true; |
| DEBUG_ONLY(verify()); |
| return result; |
| } |
| |
| PSVirtualSpace::~PSVirtualSpace() { |
| release(); |
| } |
| |
| bool PSVirtualSpace::contains(void* p) const { |
| char* const cp = (char*)p; |
| return cp >= committed_low_addr() && cp < committed_high_addr(); |
| } |
| |
| void PSVirtualSpace::release() { |
| DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); |
| // This may not release memory it didn't reserve. |
| // Use rs.release() to release the underlying memory instead. |
| _reserved_low_addr = _reserved_high_addr = NULL; |
| _committed_low_addr = _committed_high_addr = NULL; |
| _special = false; |
| } |
| |
| bool PSVirtualSpace::expand_by(size_t bytes) { |
| assert(is_aligned(bytes), "arg not aligned"); |
| DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); |
| |
| if (uncommitted_size() < bytes) { |
| return false; |
| } |
| |
| char* const base_addr = committed_high_addr(); |
| bool result = special() || |
| os::commit_memory(base_addr, bytes, alignment(), !ExecMem); |
| if (result) { |
| _committed_high_addr += bytes; |
| } |
| |
| return result; |
| } |
| |
| bool PSVirtualSpace::shrink_by(size_t bytes) { |
| assert(is_aligned(bytes), "arg not aligned"); |
| DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); |
| |
| if (committed_size() < bytes) { |
| return false; |
| } |
| |
| char* const base_addr = committed_high_addr() - bytes; |
| bool result = special() || os::uncommit_memory(base_addr, bytes); |
| if (result) { |
| _committed_high_addr -= bytes; |
| } |
| |
| return result; |
| } |
| |
| size_t |
| PSVirtualSpace::expand_into(PSVirtualSpace* other_space, size_t bytes) { |
| assert(is_aligned(bytes), "arg not aligned"); |
| assert(grows_up(), "this space must grow up"); |
| assert(other_space->grows_down(), "other space must grow down"); |
| assert(reserved_high_addr() == other_space->reserved_low_addr(), |
| "spaces not contiguous"); |
| assert(special() == other_space->special(), "one space is special, the other is not"); |
| DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); |
| DEBUG_ONLY(PSVirtualSpaceVerifier other_verifier(other_space)); |
| |
| size_t bytes_needed = bytes; |
| |
| // First use the uncommitted region in this space. |
| size_t tmp_bytes = MIN2(uncommitted_size(), bytes_needed); |
| if (tmp_bytes > 0) { |
| if (expand_by(tmp_bytes)) { |
| bytes_needed -= tmp_bytes; |
| } else { |
| return 0; |
| } |
| } |
| |
| // Next take from the uncommitted region in the other space, and commit it. |
| tmp_bytes = MIN2(other_space->uncommitted_size(), bytes_needed); |
| if (tmp_bytes > 0) { |
| char* const commit_base = committed_high_addr(); |
| if (other_space->special() || |
| os::commit_memory(commit_base, tmp_bytes, alignment(), !ExecMem)) { |
| // Reduce the reserved region in the other space. |
| other_space->set_reserved(other_space->reserved_low_addr() + tmp_bytes, |
| other_space->reserved_high_addr(), |
| other_space->special()); |
| |
| // Grow both reserved and committed in this space. |
| _reserved_high_addr += tmp_bytes; |
| _committed_high_addr += tmp_bytes; |
| bytes_needed -= tmp_bytes; |
| } else { |
| return bytes - bytes_needed; |
| } |
| } |
| |
| // Finally take from the already committed region in the other space. |
| tmp_bytes = bytes_needed; |
| if (tmp_bytes > 0) { |
| // Reduce both committed and reserved in the other space. |
| other_space->set_committed(other_space->committed_low_addr() + tmp_bytes, |
| other_space->committed_high_addr()); |
| other_space->set_reserved(other_space->reserved_low_addr() + tmp_bytes, |
| other_space->reserved_high_addr(), |
| other_space->special()); |
| |
| // Grow both reserved and committed in this space. |
| _reserved_high_addr += tmp_bytes; |
| _committed_high_addr += tmp_bytes; |
| } |
| |
| return bytes; |
| } |
| |
| #ifndef PRODUCT |
| bool PSVirtualSpace::is_aligned(size_t value, size_t align) { |
| const size_t tmp_value = value + align - 1; |
| const size_t mask = ~(align - 1); |
| return (tmp_value & mask) == value; |
| } |
| |
| bool PSVirtualSpace::is_aligned(size_t value) const { |
| return is_aligned(value, alignment()); |
| } |
| |
| bool PSVirtualSpace::is_aligned(char* value) const { |
| return is_aligned((size_t)value); |
| } |
| |
| void PSVirtualSpace::verify() const { |
| assert(is_aligned(alignment(), os::vm_page_size()), "bad alignment"); |
| assert(is_aligned(reserved_low_addr()), "bad reserved_low_addr"); |
| assert(is_aligned(reserved_high_addr()), "bad reserved_high_addr"); |
| assert(is_aligned(committed_low_addr()), "bad committed_low_addr"); |
| assert(is_aligned(committed_high_addr()), "bad committed_high_addr"); |
| |
| // Reserved region must be non-empty or both addrs must be 0. |
| assert(reserved_low_addr() < reserved_high_addr() || |
| reserved_low_addr() == NULL && reserved_high_addr() == NULL, |
| "bad reserved addrs"); |
| assert(committed_low_addr() <= committed_high_addr(), "bad committed addrs"); |
| |
| if (grows_up()) { |
| assert(reserved_low_addr() == committed_low_addr(), "bad low addrs"); |
| assert(reserved_high_addr() >= committed_high_addr(), "bad high addrs"); |
| } else { |
| assert(reserved_high_addr() == committed_high_addr(), "bad high addrs"); |
| assert(reserved_low_addr() <= committed_low_addr(), "bad low addrs"); |
| } |
| } |
| |
| void PSVirtualSpace::print() const { |
| gclog_or_tty->print_cr("virtual space [" PTR_FORMAT "]: alignment=" |
| SIZE_FORMAT "K grows %s%s", |
| this, alignment() / K, grows_up() ? "up" : "down", |
| special() ? " (pinned in memory)" : ""); |
| gclog_or_tty->print_cr(" reserved=" SIZE_FORMAT "K" |
| " [" PTR_FORMAT "," PTR_FORMAT "]" |
| " committed=" SIZE_FORMAT "K" |
| " [" PTR_FORMAT "," PTR_FORMAT "]", |
| reserved_size() / K, |
| reserved_low_addr(), reserved_high_addr(), |
| committed_size() / K, |
| committed_low_addr(), committed_high_addr()); |
| } |
| #endif // #ifndef PRODUCT |
| |
| void PSVirtualSpace::print_space_boundaries_on(outputStream* st) const { |
| st->print_cr(" [" PTR_FORMAT ", " PTR_FORMAT ", " PTR_FORMAT ")", |
| low_boundary(), high(), high_boundary()); |
| } |
| |
| PSVirtualSpaceHighToLow::PSVirtualSpaceHighToLow(ReservedSpace rs, |
| size_t alignment) : |
| PSVirtualSpace(alignment) |
| { |
| set_reserved(rs); |
| set_committed(reserved_high_addr(), reserved_high_addr()); |
| DEBUG_ONLY(verify()); |
| } |
| |
| PSVirtualSpaceHighToLow::PSVirtualSpaceHighToLow(ReservedSpace rs) { |
| set_reserved(rs); |
| set_committed(reserved_high_addr(), reserved_high_addr()); |
| DEBUG_ONLY(verify()); |
| } |
| |
| bool PSVirtualSpaceHighToLow::expand_by(size_t bytes) { |
| assert(is_aligned(bytes), "arg not aligned"); |
| DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); |
| |
| if (uncommitted_size() < bytes) { |
| return false; |
| } |
| |
| char* const base_addr = committed_low_addr() - bytes; |
| bool result = special() || |
| os::commit_memory(base_addr, bytes, alignment(), !ExecMem); |
| if (result) { |
| _committed_low_addr -= bytes; |
| } |
| |
| return result; |
| } |
| |
| bool PSVirtualSpaceHighToLow::shrink_by(size_t bytes) { |
| assert(is_aligned(bytes), "arg not aligned"); |
| DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); |
| |
| if (committed_size() < bytes) { |
| return false; |
| } |
| |
| char* const base_addr = committed_low_addr(); |
| bool result = special() || os::uncommit_memory(base_addr, bytes); |
| if (result) { |
| _committed_low_addr += bytes; |
| } |
| |
| return result; |
| } |
| |
| size_t PSVirtualSpaceHighToLow::expand_into(PSVirtualSpace* other_space, |
| size_t bytes) { |
| assert(is_aligned(bytes), "arg not aligned"); |
| assert(grows_down(), "this space must grow down"); |
| assert(other_space->grows_up(), "other space must grow up"); |
| assert(reserved_low_addr() == other_space->reserved_high_addr(), |
| "spaces not contiguous"); |
| assert(special() == other_space->special(), "one space is special in memory, the other is not"); |
| DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); |
| DEBUG_ONLY(PSVirtualSpaceVerifier other_verifier(other_space)); |
| |
| size_t bytes_needed = bytes; |
| |
| // First use the uncommitted region in this space. |
| size_t tmp_bytes = MIN2(uncommitted_size(), bytes_needed); |
| if (tmp_bytes > 0) { |
| if (expand_by(tmp_bytes)) { |
| bytes_needed -= tmp_bytes; |
| } else { |
| return 0; |
| } |
| } |
| |
| // Next take from the uncommitted region in the other space, and commit it. |
| tmp_bytes = MIN2(other_space->uncommitted_size(), bytes_needed); |
| if (tmp_bytes > 0) { |
| char* const commit_base = committed_low_addr() - tmp_bytes; |
| if (other_space->special() || |
| os::commit_memory(commit_base, tmp_bytes, alignment(), !ExecMem)) { |
| // Reduce the reserved region in the other space. |
| other_space->set_reserved(other_space->reserved_low_addr(), |
| other_space->reserved_high_addr() - tmp_bytes, |
| other_space->special()); |
| |
| // Grow both reserved and committed in this space. |
| _reserved_low_addr -= tmp_bytes; |
| _committed_low_addr -= tmp_bytes; |
| bytes_needed -= tmp_bytes; |
| } else { |
| return bytes - bytes_needed; |
| } |
| } |
| |
| // Finally take from the already committed region in the other space. |
| tmp_bytes = bytes_needed; |
| if (tmp_bytes > 0) { |
| // Reduce both committed and reserved in the other space. |
| other_space->set_committed(other_space->committed_low_addr(), |
| other_space->committed_high_addr() - tmp_bytes); |
| other_space->set_reserved(other_space->reserved_low_addr(), |
| other_space->reserved_high_addr() - tmp_bytes, |
| other_space->special()); |
| |
| // Grow both reserved and committed in this space. |
| _reserved_low_addr -= tmp_bytes; |
| _committed_low_addr -= tmp_bytes; |
| } |
| |
| return bytes; |
| } |
| |
| void |
| PSVirtualSpaceHighToLow::print_space_boundaries_on(outputStream* st) const { |
| st->print_cr(" (" PTR_FORMAT ", " PTR_FORMAT ", " PTR_FORMAT "]", |
| high_boundary(), low(), low_boundary()); |
| } |