146 lines
5.5 KiB
C++
146 lines
5.5 KiB
C++
// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
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// Copyright (c) 2008, Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// ---
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// Author: Ken Ashcraft <opensource@google.com>
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#include <config.h>
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#include "static_vars.h"
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#include <stddef.h> // for NULL
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#include <new> // for operator new
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#ifdef HAVE_PTHREAD
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#include <pthread.h> // for pthread_atfork
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#endif
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#include "internal_logging.h" // for CHECK_CONDITION
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#include "common.h"
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#include "sampler.h" // for Sampler
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#include "getenv_safe.h" // TCMallocGetenvSafe
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#include "base/googleinit.h"
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namespace tcmalloc {
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#if defined(HAVE_FORK) && defined(HAVE_PTHREAD)
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// These following two functions are registered via pthread_atfork to make
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// sure the central_cache locks remain in a consisten state in the forked
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// version of the thread.
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void CentralCacheLockAll() NO_THREAD_SAFETY_ANALYSIS
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{
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Static::pageheap_lock()->Lock();
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for (int i = 0; i < Static::num_size_classes(); ++i)
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Static::central_cache()[i].Lock();
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}
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void CentralCacheUnlockAll() NO_THREAD_SAFETY_ANALYSIS
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{
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for (int i = 0; i < Static::num_size_classes(); ++i)
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Static::central_cache()[i].Unlock();
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Static::pageheap_lock()->Unlock();
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}
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#endif
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bool Static::inited_;
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SizeMap Static::sizemap_;
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CentralFreeListPadded Static::central_cache_[kClassSizesMax];
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PageHeapAllocator<Span> Static::span_allocator_;
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PageHeapAllocator<StackTrace> Static::stacktrace_allocator_;
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Span Static::sampled_objects_;
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std::atomic<StackTrace*> Static::growth_stacks_;
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Static::PageHeapStorage Static::pageheap_;
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void Static::InitStaticVars() {
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sizemap_.Init();
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span_allocator_.Init();
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span_allocator_.New(); // Reduce cache conflicts
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span_allocator_.New(); // Reduce cache conflicts
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stacktrace_allocator_.Init();
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// Do a bit of sanitizing: make sure central_cache is aligned properly
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CHECK_CONDITION((sizeof(central_cache_[0]) % 64) == 0);
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for (int i = 0; i < num_size_classes(); ++i) {
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central_cache_[i].Init(i);
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}
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new (&pageheap_.memory) PageHeap(sizemap_.min_span_size_in_pages());
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#if defined(ENABLE_AGGRESSIVE_DECOMMIT_BY_DEFAULT)
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const bool kDefaultAggressiveDecommit = true;
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#else
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const bool kDefaultAggressiveDecommit = false;
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#endif
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bool aggressive_decommit =
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tcmalloc::commandlineflags::StringToBool(
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TCMallocGetenvSafe("TCMALLOC_AGGRESSIVE_DECOMMIT"),
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kDefaultAggressiveDecommit);
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pageheap()->SetAggressiveDecommit(aggressive_decommit);
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inited_ = true;
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DLL_Init(&sampled_objects_);
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}
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void Static::InitLateMaybeRecursive() {
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#if defined(HAVE_FORK) && defined(HAVE_PTHREAD) \
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&& !defined(__APPLE__) && !defined(TCMALLOC_NO_ATFORK) \
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&& !defined(PTHREADS_CRASHES_IF_RUN_TOO_EARLY)
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// OSX has it's own way of handling atfork in malloc (see
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// libc_override_osx.h).
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//
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// For other OSes we do pthread_atfork even if standard seemingly
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// discourages pthread_atfork, asking apps to do only
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// async-signal-safe calls between fork and exec.
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//
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// We're deliberately attempting to register atfork handlers as part
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// of malloc initialization. So very early. This ensures that our
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// handler is called last and that means fork will try to grab
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// tcmalloc locks last avoiding possible issues with many other
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// locks that are held around calls to malloc. I.e. if we don't do
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// that, fork() grabbing malloc lock before such other lock would be
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// prone to deadlock, if some other thread holds other lock and
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// calls malloc.
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//
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// We still leave some way of disabling it via
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// -DTCMALLOC_NO_ATFORK. It looks like on glibc even with fully
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// static binaries malloc is really initialized very early. But I
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// can see how combination of static linking and other libc-s could
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// be less fortunate and allow some early app constructors to run
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// before malloc is ever called.
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pthread_atfork(
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CentralCacheLockAll, // parent calls before fork
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CentralCacheUnlockAll, // parent calls after fork
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CentralCacheUnlockAll); // child calls after fork
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#endif
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}
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} // namespace tcmalloc
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