hotspot/src/share/vm/memory/threadLocalAllocBuffer.cpp
author tonyp
Tue, 08 Nov 2011 00:41:28 -0500
changeset 10997 0be4b3be7197
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child 14583 d70ee55535f4
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7099849: G1: include heap region information in hs_err files Reviewed-by: johnc, brutisso, poonam
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/*
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 * Copyright (c) 1999, 2011, 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 "memory/genCollectedHeap.hpp"
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#include "memory/resourceArea.hpp"
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#include "memory/threadLocalAllocBuffer.inline.hpp"
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#include "memory/universe.inline.hpp"
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#include "oops/oop.inline.hpp"
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#include "utilities/copy.hpp"
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#ifdef TARGET_OS_FAMILY_linux
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# include "thread_linux.inline.hpp"
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#endif
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#ifdef TARGET_OS_FAMILY_solaris
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# include "thread_solaris.inline.hpp"
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#endif
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#ifdef TARGET_OS_FAMILY_windows
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# include "thread_windows.inline.hpp"
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#endif
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#ifdef TARGET_OS_FAMILY_bsd
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# include "thread_bsd.inline.hpp"
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#endif
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// Thread-Local Edens support
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// static member initialization
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unsigned         ThreadLocalAllocBuffer::_target_refills = 0;
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GlobalTLABStats* ThreadLocalAllocBuffer::_global_stats   = NULL;
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void ThreadLocalAllocBuffer::clear_before_allocation() {
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  _slow_refill_waste += (unsigned)remaining();
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  make_parsable(true);   // also retire the TLAB
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}
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void ThreadLocalAllocBuffer::accumulate_statistics_before_gc() {
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  global_stats()->initialize();
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  for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) {
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    thread->tlab().accumulate_statistics();
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    thread->tlab().initialize_statistics();
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  }
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  // Publish new stats if some allocation occurred.
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  if (global_stats()->allocation() != 0) {
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    global_stats()->publish();
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    if (PrintTLAB) {
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      global_stats()->print();
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    }
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  }
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}
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void ThreadLocalAllocBuffer::accumulate_statistics() {
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  size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize;
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  size_t unused   = Universe::heap()->unsafe_max_tlab_alloc(myThread()) / HeapWordSize;
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  size_t used     = capacity - unused;
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  // Update allocation history if a reasonable amount of eden was allocated.
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  bool update_allocation_history = used > 0.5 * capacity;
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  _gc_waste += (unsigned)remaining();
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  if (PrintTLAB && (_number_of_refills > 0 || Verbose)) {
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    print_stats("gc");
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  }
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  if (_number_of_refills > 0) {
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    if (update_allocation_history) {
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      // Average the fraction of eden allocated in a tlab by this
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      // thread for use in the next resize operation.
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      // _gc_waste is not subtracted because it's included in
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      // "used".
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      size_t allocation = _number_of_refills * desired_size();
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      double alloc_frac = allocation / (double) used;
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      _allocation_fraction.sample(alloc_frac);
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    }
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    global_stats()->update_allocating_threads();
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    global_stats()->update_number_of_refills(_number_of_refills);
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    global_stats()->update_allocation(_number_of_refills * desired_size());
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    global_stats()->update_gc_waste(_gc_waste);
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    global_stats()->update_slow_refill_waste(_slow_refill_waste);
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    global_stats()->update_fast_refill_waste(_fast_refill_waste);
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  } else {
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    assert(_number_of_refills == 0 && _fast_refill_waste == 0 &&
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           _slow_refill_waste == 0 && _gc_waste          == 0,
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           "tlab stats == 0");
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  }
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  global_stats()->update_slow_allocations(_slow_allocations);
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}
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// Fills the current tlab with a dummy filler array to create
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// an illusion of a contiguous Eden and optionally retires the tlab.
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// Waste accounting should be done in caller as appropriate; see,
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// for example, clear_before_allocation().
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void ThreadLocalAllocBuffer::make_parsable(bool retire) {
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  if (end() != NULL) {
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    invariants();
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    if (retire) {
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      myThread()->incr_allocated_bytes(used_bytes());
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    }
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    CollectedHeap::fill_with_object(top(), hard_end(), retire);
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    if (retire || ZeroTLAB) {  // "Reset" the TLAB
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      set_start(NULL);
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      set_top(NULL);
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      set_pf_top(NULL);
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      set_end(NULL);
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    }
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  }
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  assert(!(retire || ZeroTLAB)  ||
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         (start() == NULL && end() == NULL && top() == NULL),
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         "TLAB must be reset");
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}
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void ThreadLocalAllocBuffer::resize_all_tlabs() {
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  for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) {
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    thread->tlab().resize();
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  }
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}
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void ThreadLocalAllocBuffer::resize() {
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  if (ResizeTLAB) {
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    // Compute the next tlab size using expected allocation amount
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    size_t alloc = (size_t)(_allocation_fraction.average() *
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                            (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize));
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    size_t new_size = alloc / _target_refills;
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    new_size = MIN2(MAX2(new_size, min_size()), max_size());
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    size_t aligned_new_size = align_object_size(new_size);
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    if (PrintTLAB && Verbose) {
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      gclog_or_tty->print("TLAB new size: thread: " INTPTR_FORMAT " [id: %2d]"
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                          " refills %d  alloc: %8.6f desired_size: " SIZE_FORMAT " -> " SIZE_FORMAT "\n",
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                          myThread(), myThread()->osthread()->thread_id(),
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                          _target_refills, _allocation_fraction.average(), desired_size(), aligned_new_size);
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    }
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    set_desired_size(aligned_new_size);
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    set_refill_waste_limit(initial_refill_waste_limit());
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  }
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}
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void ThreadLocalAllocBuffer::initialize_statistics() {
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    _number_of_refills = 0;
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    _fast_refill_waste = 0;
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    _slow_refill_waste = 0;
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    _gc_waste          = 0;
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    _slow_allocations  = 0;
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}
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void ThreadLocalAllocBuffer::fill(HeapWord* start,
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                                  HeapWord* top,
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                                  size_t    new_size) {
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  _number_of_refills++;
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  if (PrintTLAB && Verbose) {
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    print_stats("fill");
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  }
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  assert(top <= start + new_size - alignment_reserve(), "size too small");
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  initialize(start, top, start + new_size - alignment_reserve());
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  // Reset amount of internal fragmentation
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  set_refill_waste_limit(initial_refill_waste_limit());
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}
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void ThreadLocalAllocBuffer::initialize(HeapWord* start,
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                                        HeapWord* top,
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                                        HeapWord* end) {
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  set_start(start);
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  set_top(top);
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  set_pf_top(top);
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  set_end(end);
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  invariants();
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}
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void ThreadLocalAllocBuffer::initialize() {
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  initialize(NULL,                    // start
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             NULL,                    // top
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             NULL);                   // end
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  set_desired_size(initial_desired_size());
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  // Following check is needed because at startup the main (primordial)
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  // thread is initialized before the heap is.  The initialization for
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  // this thread is redone in startup_initialization below.
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  if (Universe::heap() != NULL) {
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    size_t capacity   = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize;
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    double alloc_frac = desired_size() * target_refills() / (double) capacity;
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    _allocation_fraction.sample(alloc_frac);
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  }
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  set_refill_waste_limit(initial_refill_waste_limit());
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  initialize_statistics();
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}
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void ThreadLocalAllocBuffer::startup_initialization() {
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  // Assuming each thread's active tlab is, on average,
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  // 1/2 full at a GC
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  _target_refills = 100 / (2 * TLABWasteTargetPercent);
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  _target_refills = MAX2(_target_refills, (unsigned)1U);
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  _global_stats = new GlobalTLABStats();
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  // During jvm startup, the main (primordial) thread is initialized
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  // before the heap is initialized.  So reinitialize it now.
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  guarantee(Thread::current()->is_Java_thread(), "tlab initialization thread not Java thread");
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  Thread::current()->tlab().initialize();
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  if (PrintTLAB && Verbose) {
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    gclog_or_tty->print("TLAB min: " SIZE_FORMAT " initial: " SIZE_FORMAT " max: " SIZE_FORMAT "\n",
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                        min_size(), Thread::current()->tlab().initial_desired_size(), max_size());
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  }
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}
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size_t ThreadLocalAllocBuffer::initial_desired_size() {
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  size_t init_sz;
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  if (TLABSize > 0) {
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    init_sz = MIN2(TLABSize / HeapWordSize, max_size());
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  } else if (global_stats() == NULL) {
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    // Startup issue - main thread initialized before heap initialized.
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    init_sz = min_size();
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  } else {
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    // Initial size is a function of the average number of allocating threads.
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    unsigned nof_threads = global_stats()->allocating_threads_avg();
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    init_sz  = (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize) /
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                      (nof_threads * target_refills());
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    init_sz = align_object_size(init_sz);
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    init_sz = MIN2(MAX2(init_sz, min_size()), max_size());
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  }
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  return init_sz;
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}
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const size_t ThreadLocalAllocBuffer::max_size() {
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  // TLABs can't be bigger than we can fill with a int[Integer.MAX_VALUE].
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  // This restriction could be removed by enabling filling with multiple arrays.
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  // If we compute that the reasonable way as
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  //    header_size + ((sizeof(jint) * max_jint) / HeapWordSize)
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  // we'll overflow on the multiply, so we do the divide first.
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  // We actually lose a little by dividing first,
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  // but that just makes the TLAB  somewhat smaller than the biggest array,
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  // which is fine, since we'll be able to fill that.
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  size_t unaligned_max_size = typeArrayOopDesc::header_size(T_INT) +
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                              sizeof(jint) *
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                              ((juint) max_jint / (size_t) HeapWordSize);
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  return align_size_down(unaligned_max_size, MinObjAlignment);
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}
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void ThreadLocalAllocBuffer::print_stats(const char* tag) {
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  Thread* thrd = myThread();
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  size_t waste = _gc_waste + _slow_refill_waste + _fast_refill_waste;
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  size_t alloc = _number_of_refills * _desired_size;
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  double waste_percent = alloc == 0 ? 0.0 :
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                      100.0 * waste / alloc;
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  size_t tlab_used  = Universe::heap()->tlab_capacity(thrd) -
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                      Universe::heap()->unsafe_max_tlab_alloc(thrd);
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  gclog_or_tty->print("TLAB: %s thread: " INTPTR_FORMAT " [id: %2d]"
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                      " desired_size: " SIZE_FORMAT "KB"
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                      " slow allocs: %d  refill waste: " SIZE_FORMAT "B"
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                      " alloc:%8.5f %8.0fKB refills: %d waste %4.1f%% gc: %dB"
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                      " slow: %dB fast: %dB\n",
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                      tag, thrd, thrd->osthread()->thread_id(),
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                      _desired_size / (K / HeapWordSize),
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                      _slow_allocations, _refill_waste_limit * HeapWordSize,
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                      _allocation_fraction.average(),
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                      _allocation_fraction.average() * tlab_used / K,
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                      _number_of_refills, waste_percent,
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                      _gc_waste * HeapWordSize,
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                      _slow_refill_waste * HeapWordSize,
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                      _fast_refill_waste * HeapWordSize);
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}
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void ThreadLocalAllocBuffer::verify() {
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  HeapWord* p = start();
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  HeapWord* t = top();
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  HeapWord* prev_p = NULL;
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  while (p < t) {
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    oop(p)->verify();
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    prev_p = p;
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    p += oop(p)->size();
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  }
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  guarantee(p == top(), "end of last object must match end of space");
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}
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Thread* ThreadLocalAllocBuffer::myThread() {
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  return (Thread*)(((char *)this) +
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                   in_bytes(start_offset()) -
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                   in_bytes(Thread::tlab_start_offset()));
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}
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GlobalTLABStats::GlobalTLABStats() :
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  _allocating_threads_avg(TLABAllocationWeight) {
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  initialize();
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  _allocating_threads_avg.sample(1); // One allocating thread at startup
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  if (UsePerfData) {
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   330
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    EXCEPTION_MARK;
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    ResourceMark rm;
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    char* cname = PerfDataManager::counter_name("tlab", "allocThreads");
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    _perf_allocating_threads =
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      PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
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    cname = PerfDataManager::counter_name("tlab", "fills");
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    _perf_total_refills =
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      PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
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    cname = PerfDataManager::counter_name("tlab", "maxFills");
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    _perf_max_refills =
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      PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
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    cname = PerfDataManager::counter_name("tlab", "alloc");
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    _perf_allocation =
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      PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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    cname = PerfDataManager::counter_name("tlab", "gcWaste");
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    _perf_gc_waste =
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      PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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   353
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    cname = PerfDataManager::counter_name("tlab", "maxGcWaste");
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    _perf_max_gc_waste =
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      PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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    cname = PerfDataManager::counter_name("tlab", "slowWaste");
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    _perf_slow_refill_waste =
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      PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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    cname = PerfDataManager::counter_name("tlab", "maxSlowWaste");
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    _perf_max_slow_refill_waste =
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      PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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    cname = PerfDataManager::counter_name("tlab", "fastWaste");
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    _perf_fast_refill_waste =
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      PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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   369
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    cname = PerfDataManager::counter_name("tlab", "maxFastWaste");
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    _perf_max_fast_refill_waste =
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      PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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    cname = PerfDataManager::counter_name("tlab", "slowAlloc");
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    _perf_slow_allocations =
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      PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
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    cname = PerfDataManager::counter_name("tlab", "maxSlowAlloc");
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    _perf_max_slow_allocations =
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      PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
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  }
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}
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   383
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   384
void GlobalTLABStats::initialize() {
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  // Clear counters summarizing info from all threads
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  _allocating_threads      = 0;
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  _total_refills           = 0;
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  _max_refills             = 0;
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  _total_allocation        = 0;
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  _total_gc_waste          = 0;
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   391
  _max_gc_waste            = 0;
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  _total_slow_refill_waste = 0;
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  _max_slow_refill_waste   = 0;
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   394
  _total_fast_refill_waste = 0;
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   395
  _max_fast_refill_waste   = 0;
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   396
  _total_slow_allocations  = 0;
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   397
  _max_slow_allocations    = 0;
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   398
}
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   399
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   400
void GlobalTLABStats::publish() {
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  _allocating_threads_avg.sample(_allocating_threads);
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   402
  if (UsePerfData) {
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   403
    _perf_allocating_threads   ->set_value(_allocating_threads);
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   404
    _perf_total_refills        ->set_value(_total_refills);
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   405
    _perf_max_refills          ->set_value(_max_refills);
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   406
    _perf_allocation           ->set_value(_total_allocation);
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   407
    _perf_gc_waste             ->set_value(_total_gc_waste);
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   408
    _perf_max_gc_waste         ->set_value(_max_gc_waste);
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   409
    _perf_slow_refill_waste    ->set_value(_total_slow_refill_waste);
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   410
    _perf_max_slow_refill_waste->set_value(_max_slow_refill_waste);
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   411
    _perf_fast_refill_waste    ->set_value(_total_fast_refill_waste);
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   412
    _perf_max_fast_refill_waste->set_value(_max_fast_refill_waste);
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   413
    _perf_slow_allocations     ->set_value(_total_slow_allocations);
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   414
    _perf_max_slow_allocations ->set_value(_max_slow_allocations);
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   415
  }
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   416
}
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   417
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   418
void GlobalTLABStats::print() {
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   419
  size_t waste = _total_gc_waste + _total_slow_refill_waste + _total_fast_refill_waste;
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   420
  double waste_percent = _total_allocation == 0 ? 0.0 :
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   421
                         100.0 * waste / _total_allocation;
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   422
  gclog_or_tty->print("TLAB totals: thrds: %d  refills: %d max: %d"
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   423
                      " slow allocs: %d max %d waste: %4.1f%%"
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   424
                      " gc: " SIZE_FORMAT "B max: " SIZE_FORMAT "B"
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   425
                      " slow: " SIZE_FORMAT "B max: " SIZE_FORMAT "B"
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   426
                      " fast: " SIZE_FORMAT "B max: " SIZE_FORMAT "B\n",
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   427
                      _allocating_threads,
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   428
                      _total_refills, _max_refills,
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   429
                      _total_slow_allocations, _max_slow_allocations,
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   430
                      waste_percent,
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   431
                      _total_gc_waste * HeapWordSize,
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   432
                      _max_gc_waste * HeapWordSize,
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   433
                      _total_slow_refill_waste * HeapWordSize,
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   434
                      _max_slow_refill_waste * HeapWordSize,
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   435
                      _total_fast_refill_waste * HeapWordSize,
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   436
                      _max_fast_refill_waste * HeapWordSize);
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diff changeset
   437
}