jdk8-mips64-public/hotspot: comparison src/share/vm/gc_implementation/parallelScavenge/psVirtualspace.cpp

--1:000000000000
+:f90c822e73f8
+/*
+* 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());
+}

Mercurial > jdk8-mips64-public > hotspot / file comparison

comparison: src/share/vm/gc_implementation/parallelScavenge/psVirtualspace.cpp

src/share/vm/gc_implementation/parallelScavenge/psVirtualspace.cpp