base/sys_info_android.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/sys_info.h"
   6
   7 #include <sys/system_properties.h>
   8
   9 #include "base/logging.h"
  10 #include "base/string_number_conversions.h"
  11 #include "base/string_piece.h"
  12
  13 namespace {
  14
  15 int ParseHeapSize(const base::StringPiece& str) {
  16   const int64 KB = 1024;
  17   const int64 MB = 1024 * KB;
  18   const int64 GB = 1024 * MB;
  19   CHECK_GT(str.size(), 0u);
  20   int64 factor = 1;
  21   size_t length = str.size();
  22   if (str[length - 1] == 'k') {
  23     factor = KB;
  24     length--;
  25   } else if (str[length - 1] == 'm') {
  26     factor = MB;
  27     length--;
  28   } else if (str[length - 1] == 'g') {
  29     factor = GB;
  30     length--;
  31   } else {
  32     CHECK('0' <= str[length - 1] && str[length - 1] <= '9');
  33   }
  34   int64 result = 0;
  35   bool parsed = base::StringToInt64(str.substr(0, length), &result);
  36   CHECK(parsed);
  37   result = result * factor / MB;
  38   // dalvik.vm.heapsize property is writable by user,
  39   // truncate it to reasonable value to avoid overflows later.
  40   result = std::min<int64>(std::max<int64>(32, result), 1024);
  41   return static_cast<int>(result);
  42 }
  43
  44 int GetDalvikHeapSizeMB() {
  45   char heap_size_str[PROP_VALUE_MAX];
  46   __system_property_get("dalvik.vm.heapsize", heap_size_str);
  47   return ParseHeapSize(heap_size_str);
  48 }
  49
  50 }  // anonymous namespace
  51
  52 namespace base {
  53
  54 int SysInfo::DalvikHeapSizeMB() {
  55   static int heap_size = GetDalvikHeapSizeMB();
  56   return heap_size;
  57 }
  58
  59 }  // namespace base