paged_memory.cc | Explore in Territory

/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "perfetto/ext/base/paged_memory.h"

#include <algorithm>
#include <cmath>
#include <cstddef>

#if PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
#include <Windows.h>
#else  // PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
#include <sys/mman.h>
#endif  // PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)

#include "perfetto/base/logging.h"
#include "perfetto/ext/base/container_annotations.h"
#include "perfetto/ext/base/utils.h"

namespace perfetto {
namespace base {

namespace {

#if TRACK_COMMITTED_SIZE()
constexpr size_t kCommitChunkSize = 4 * 1024 * 1024;  // 4MB
#endif

size_t RoundUpToSysPageSize(size_t req_size) { … }

size_t GuardSize() { … }

}  // namespace

// static
PagedMemory PagedMemory::Allocate(size_t req_size, int flags) { … }

PagedMemory::PagedMemory() { … }

// clang-format off
PagedMemory::PagedMemory(char* p, size_t size) : … { … }

PagedMemory::PagedMemory(PagedMemory&& other) noexcept { … }
// clang-format on

PagedMemory& PagedMemory::operator=(PagedMemory&& other) { … }

PagedMemory::~PagedMemory() { … }

bool PagedMemory::AdviseDontNeed(void* p, size_t size) { … }

#if TRACK_COMMITTED_SIZE()
void PagedMemory::EnsureCommitted(size_t committed_size) {
  PERFETTO_DCHECK(committed_size <= size_);
#if PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
  if (committed_size_ >= committed_size)
    return;
  // Rounding up.
  size_t delta = committed_size - committed_size_;
  size_t num_additional_chunks =
      (delta + kCommitChunkSize - 1) / kCommitChunkSize;
  PERFETTO_DCHECK(num_additional_chunks * kCommitChunkSize >= delta);
  // Don't commit more than the total size.
  size_t commit_size = std::min(num_additional_chunks * kCommitChunkSize,
                                size_ - committed_size_);
  void* res = VirtualAlloc(p_ + committed_size_, commit_size, MEM_COMMIT,
                           PAGE_READWRITE);
  PERFETTO_CHECK(res);
  ANNOTATE_CHANGE_SIZE(p_, size_, committed_size_,
                       committed_size_ + commit_size)
  committed_size_ += commit_size;
#else   // PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
  // mmap commits automatically as needed, so we only track here for ASAN.
  committed_size = std::max(committed_size_, committed_size);
  ANNOTATE_CHANGE_SIZE(p_, size_, committed_size_, committed_size)
  committed_size_ = committed_size;
#endif  // PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
}
#endif  // TRACK_COMMITTED_SIZE()

}  // namespace base
}  // namespace perfetto
chromium/third_party/perfetto/src/base/paged_memory.cc
