src/hotspot/share/runtime/safepointMechanism.cpp
author rehn
Fri, 15 Feb 2019 14:15:10 +0100
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8203469: Faster safepoints Reviewed-by: dcubed, pchilanomate, dholmes, acorn, coleenp, eosterlund
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/*
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 * Copyright (c) 2017, 2019, 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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#include "precompiled.hpp"
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#include "logging/log.hpp"
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#include "runtime/globals.hpp"
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#include "runtime/os.hpp"
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#include "runtime/safepointMechanism.inline.hpp"
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#include "services/memTracker.hpp"
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#include "utilities/globalDefinitions.hpp"
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SafepointMechanism::PollingType SafepointMechanism::_polling_type = SafepointMechanism::_global_page_poll;
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void* SafepointMechanism::_poll_armed_value;
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void* SafepointMechanism::_poll_disarmed_value;
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void SafepointMechanism::default_initialize() {
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  if (ThreadLocalHandshakes) {
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    set_uses_thread_local_poll();
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    // Poll bit values
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    intptr_t poll_armed_value = poll_bit();
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    intptr_t poll_disarmed_value = 0;
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#ifdef USE_POLL_BIT_ONLY
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    if (!USE_POLL_BIT_ONLY)
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#endif
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    {
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      // Polling page
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      const size_t page_size = os::vm_page_size();
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      const size_t allocation_size = 2 * page_size;
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      char* polling_page = os::reserve_memory(allocation_size, NULL, page_size);
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      os::commit_memory_or_exit(polling_page, allocation_size, false, "Unable to commit Safepoint polling page");
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      MemTracker::record_virtual_memory_type((address)polling_page, mtSafepoint);
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      char* bad_page  = polling_page;
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      char* good_page = polling_page + page_size;
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      os::protect_memory(bad_page,  page_size, os::MEM_PROT_NONE);
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      os::protect_memory(good_page, page_size, os::MEM_PROT_READ);
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      log_info(os)("SafePoint Polling address, bad (protected) page:" INTPTR_FORMAT ", good (unprotected) page:" INTPTR_FORMAT, p2i(bad_page), p2i(good_page));
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      os::set_polling_page((address)(bad_page));
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      // Poll address values
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      intptr_t bad_page_val  = reinterpret_cast<intptr_t>(bad_page),
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               good_page_val = reinterpret_cast<intptr_t>(good_page);
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      poll_armed_value    |= bad_page_val;
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      poll_disarmed_value |= good_page_val;
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    }
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    _poll_armed_value    = reinterpret_cast<void*>(poll_armed_value);
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    _poll_disarmed_value = reinterpret_cast<void*>(poll_disarmed_value);
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  } else {
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    const size_t page_size = os::vm_page_size();
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    char* polling_page = os::reserve_memory(page_size, NULL, page_size);
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    os::commit_memory_or_exit(polling_page, page_size, false, "Unable to commit Safepoint polling page");
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    os::protect_memory(polling_page, page_size, os::MEM_PROT_READ);
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    MemTracker::record_virtual_memory_type((address)polling_page, mtSafepoint);
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    log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page));
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    os::set_polling_page((address)(polling_page));
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  }
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}
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void SafepointMechanism::block_if_requested_slow(JavaThread *thread) {
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  // local poll already checked, if used.
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  if (global_poll()) {
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    // Any load in ::block must not pass the global poll load.
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    // Otherwise we might load an old safepoint counter (for example).
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    OrderAccess::loadload();
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    SafepointSynchronize::block(thread);
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  }
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  if (uses_thread_local_poll() && thread->has_handshake()) {
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      thread->handshake_process_by_self();
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  }
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}
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void SafepointMechanism::initialize_header(JavaThread* thread) {
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  disarm_local_poll(thread);
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}
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void SafepointMechanism::initialize() {
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  pd_initialize();
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}