jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/psVirtualspace.cpp@4dfb2df418f2 (annotated)

src/share/vm/gc_implementation/parallelScavenge/psVirtualspace.cpp@4dfb2df418f2 (annotated)

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

Thu, 22 Sep 2011 10:57:37 -0700

author: johnc
date: Thu, 22 Sep 2011 10:57:37 -0700
changeset 3175: 4dfb2df418f2
parent 2314: f95d63e2154a
child 3156: f08d439fab8c
permissions: -rw-r--r--

6484982: G1: process references during evacuation pauses
Summary: G1 now uses two reference processors - one is used by concurrent marking and the other is used by STW GCs (both full and incremental evacuation pauses). In an evacuation pause, the reference processor is embedded into the closures used to scan objects. Doing so causes causes reference objects to be 'discovered' by the reference processor. At the end of the evacuation pause, these discovered reference objects are processed - preserving (and copying) referent objects (and their reachable graphs) as appropriate.
Reviewed-by: ysr, jwilhelm, brutisso, stefank, tonyp

 /*
  * Copyright (c) 2003, 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.
  *
  */
 #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
 // 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());
   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())) {
       // 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());
   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())) {
       // 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 / annotate

src/share/vm/gc_implementation/parallelScavenge/psVirtualspace.cpp@4dfb2df418f2 (annotated)

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