More memory stats code cleanup:...

chrome/test/perf/mem_usage_linux.cc

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chrome/test/perf/mem_usage.h"
-
-#include "base/file_util.h"
-#include "base/logging.h"
-#include "base/process_util.h"
-#include "base/string_util.h"
-
-namespace {
-
-// The format of /proc/meminfo is:
-//
-// MemTotal:      8235324 kB
-// MemFree:       1628304 kB
-// Buffers:        429596 kB
-// Cached:        4728232 kB
-// ...
-const size_t kMemTotalIndex = 1;
-const size_t kMemFreeIndex = 4;
-const size_t kMemBuffersIndex = 7;
-const size_t kMemCacheIndex = 10;
-
-}  // namespace
-
-size_t GetSystemCommitCharge() {
-  // Used memory is: total - free - buffers - caches
-  FilePath meminfo_file("/proc/meminfo");
-  std::string meminfo_data;
-  if (!file_util::ReadFileToString(meminfo_file, &meminfo_data))
-    return 0;
-  std::vector<std::string> meminfo_fields;
-  SplitStringAlongWhitespace(meminfo_data, &meminfo_fields);
-
-  if (meminfo_fields.size() < kMemCacheIndex) {
-    LOG(ERROR) << "Failed to parse /proc/meminfo.  Only found " <<
-      meminfo_fields.size() << " fields.";
-    return 0;
-  }
-
-  DCHECK_EQ(meminfo_fields[kMemTotalIndex-1], "MemTotal:");
-  DCHECK_EQ(meminfo_fields[kMemFreeIndex-1], "MemFree:");
-  DCHECK_EQ(meminfo_fields[kMemBuffersIndex-1], "Buffers:");
-  DCHECK_EQ(meminfo_fields[kMemCacheIndex-1], "Cached:");
-
-  int result_in_kb;
-  result_in_kb = StringToInt(meminfo_fields[kMemTotalIndex]);
-  result_in_kb -= StringToInt(meminfo_fields[kMemFreeIndex]);
-  result_in_kb -= StringToInt(meminfo_fields[kMemBuffersIndex]);
-  result_in_kb -= StringToInt(meminfo_fields[kMemCacheIndex]);
-
-  return result_in_kb * 1024;
-}
-
-void PrintChromeMemoryUsageInfo() {
-  NOTIMPLEMENTED();
-}
-