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.os.Debug; 20 import android.os.StrictMode; 21 22 public final class MemInfoReader { 23 final long[] mInfos = new long[Debug.MEMINFO_COUNT]; 24 25 public void readMemInfo() { 26 // Permit disk reads here, as /proc/meminfo isn't really "on 27 // disk" and should be fast. TODO: make BlockGuard ignore 28 // /proc/ and /sys/ files perhaps? 29 StrictMode.ThreadPolicy savedPolicy = StrictMode.allowThreadDiskReads(); 30 try { 31 Debug.getMemInfo(mInfos); 32 } finally { 33 StrictMode.setThreadPolicy(savedPolicy); 34 } 35 } 36 37 /** 38 * Total amount of RAM available to the kernel. 39 */ 40 public long getTotalSize() { 41 return mInfos[Debug.MEMINFO_TOTAL] * 1024; 42 } 43 44 /** 45 * Amount of RAM that is not being used for anything. 46 */ 47 public long getFreeSize() { 48 return mInfos[Debug.MEMINFO_FREE] * 1024; 49 } 50 51 /** 52 * Amount of RAM that the kernel is being used for caches, not counting caches 53 * that are mapped in to processes. 54 */ 55 public long getCachedSize() { 56 return getCachedSizeKb() * 1024; 57 } 58 59 /** 60 * Amount of RAM that is in use by the kernel for actual allocations. 61 */ 62 public long getKernelUsedSize() { 63 return getKernelUsedSizeKb() * 1024; 64 } 65 66 /** 67 * Total amount of RAM available to the kernel. 68 */ 69 public long getTotalSizeKb() { 70 return mInfos[Debug.MEMINFO_TOTAL]; 71 } 72 73 /** 74 * Amount of RAM that is not being used for anything. 75 */ 76 public long getFreeSizeKb() { 77 return mInfos[Debug.MEMINFO_FREE]; 78 } 79 80 /** 81 * Amount of RAM that the kernel is being used for caches, not counting caches 82 * that are mapped in to processes. 83 */ 84 public long getCachedSizeKb() { 85 return mInfos[Debug.MEMINFO_BUFFERS] + mInfos[Debug.MEMINFO_SLAB_RECLAIMABLE] 86 + mInfos[Debug.MEMINFO_CACHED] - mInfos[Debug.MEMINFO_MAPPED]; 87 } 88 89 /** 90 * Amount of RAM that is in use by the kernel for actual allocations. 91 */ 92 public long getKernelUsedSizeKb() { 93 return mInfos[Debug.MEMINFO_SHMEM] + mInfos[Debug.MEMINFO_SLAB_UNRECLAIMABLE] 94 + mInfos[Debug.MEMINFO_VM_ALLOC_USED] + mInfos[Debug.MEMINFO_PAGE_TABLES] 95 + mInfos[Debug.MEMINFO_KERNEL_STACK]; 96 } 97 98 public long getSwapTotalSizeKb() { 99 return mInfos[Debug.MEMINFO_SWAP_TOTAL]; 100 } 101 102 public long getSwapFreeSizeKb() { 103 return mInfos[Debug.MEMINFO_SWAP_FREE]; 104 } 105 106 public long getZramTotalSizeKb() { 107 return mInfos[Debug.MEMINFO_ZRAM_TOTAL]; 108 } 109 110 public long[] getRawInfo() { 111 return mInfos; 112 } 113 } 114