1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.internal.util; 18 19 import android.annotation.UnsupportedAppUsage; 20 import android.os.Debug; 21 import android.os.StrictMode; 22 23 public final class MemInfoReader { 24 final long[] mInfos = new long[Debug.MEMINFO_COUNT]; 25 26 @UnsupportedAppUsage readMemInfo()27 public void readMemInfo() { 28 // Permit disk reads here, as /proc/meminfo isn't really "on 29 // disk" and should be fast. TODO: make BlockGuard ignore 30 // /proc/ and /sys/ files perhaps? 31 StrictMode.ThreadPolicy savedPolicy = StrictMode.allowThreadDiskReads(); 32 try { 33 Debug.getMemInfo(mInfos); 34 } finally { 35 StrictMode.setThreadPolicy(savedPolicy); 36 } 37 } 38 39 /** 40 * Total amount of RAM available to the kernel. 41 */ 42 @UnsupportedAppUsage getTotalSize()43 public long getTotalSize() { 44 return mInfos[Debug.MEMINFO_TOTAL] * 1024; 45 } 46 47 /** 48 * Amount of RAM that is not being used for anything. 49 */ 50 @UnsupportedAppUsage getFreeSize()51 public long getFreeSize() { 52 return mInfos[Debug.MEMINFO_FREE] * 1024; 53 } 54 55 /** 56 * Amount of RAM that the kernel is being used for caches, not counting caches 57 * that are mapped in to processes. 58 */ 59 @UnsupportedAppUsage getCachedSize()60 public long getCachedSize() { 61 return getCachedSizeKb() * 1024; 62 } 63 64 /** 65 * Amount of RAM that is in use by the kernel for actual allocations. 66 */ getKernelUsedSize()67 public long getKernelUsedSize() { 68 return getKernelUsedSizeKb() * 1024; 69 } 70 71 /** 72 * Total amount of RAM available to the kernel. 73 */ getTotalSizeKb()74 public long getTotalSizeKb() { 75 return mInfos[Debug.MEMINFO_TOTAL]; 76 } 77 78 /** 79 * Amount of RAM that is not being used for anything. 80 */ getFreeSizeKb()81 public long getFreeSizeKb() { 82 return mInfos[Debug.MEMINFO_FREE]; 83 } 84 85 /** 86 * Amount of RAM that the kernel is being used for caches, not counting caches 87 * that are mapped in to processes. 88 */ getCachedSizeKb()89 public long getCachedSizeKb() { 90 return mInfos[Debug.MEMINFO_BUFFERS] + mInfos[Debug.MEMINFO_SLAB_RECLAIMABLE] 91 + mInfos[Debug.MEMINFO_CACHED] - mInfos[Debug.MEMINFO_MAPPED]; 92 } 93 94 /** 95 * Amount of RAM that is in use by the kernel for actual allocations. 96 */ getKernelUsedSizeKb()97 public long getKernelUsedSizeKb() { 98 return mInfos[Debug.MEMINFO_SHMEM] + mInfos[Debug.MEMINFO_SLAB_UNRECLAIMABLE] 99 + mInfos[Debug.MEMINFO_VM_ALLOC_USED] + mInfos[Debug.MEMINFO_PAGE_TABLES] 100 + mInfos[Debug.MEMINFO_KERNEL_STACK]; 101 } 102 getSwapTotalSizeKb()103 public long getSwapTotalSizeKb() { 104 return mInfos[Debug.MEMINFO_SWAP_TOTAL]; 105 } 106 getSwapFreeSizeKb()107 public long getSwapFreeSizeKb() { 108 return mInfos[Debug.MEMINFO_SWAP_FREE]; 109 } 110 getZramTotalSizeKb()111 public long getZramTotalSizeKb() { 112 return mInfos[Debug.MEMINFO_ZRAM_TOTAL]; 113 } 114 115 @UnsupportedAppUsage getRawInfo()116 public long[] getRawInfo() { 117 return mInfos; 118 } 119 } 120