Add new API to find total RAM. (59325eb3) · Commits · e / os / android_frameworks_base

core/java/android/app/ActivityManager.java

+11 −2

Original line number	Diff line number	Diff line
		@@ -1078,13 +1078,20 @@ public class ActivityManager {
		*/
		public static class MemoryInfo implements Parcelable {
		/**
		* The total available memory on the system. This number should not
		* The available memory on the system. This number should not
		* be considered absolute: due to the nature of the kernel, a significant
		* portion of this memory is actually in use and needed for the overall
		* system to run well.
		*/
		public long availMem;

		/**
		* The total memory accessible by the kernel. This is basically the
		* RAM size of the device, not including below-kernel fixed allocations
		* like DMA buffers, RAM for the baseband CPU, etc.
		*/
		public long totalMem;

		/**
		* The threshold of {@link #availMem} at which we consider memory to be
		* low and start killing background services and other non-extraneous
		@@ -1116,6 +1123,7 @@ public class ActivityManager {

		public void writeToParcel(Parcel dest, int flags) {
		dest.writeLong(availMem);
		dest.writeLong(totalMem);
		dest.writeLong(threshold);
		dest.writeInt(lowMemory ? 1 : 0);
		dest.writeLong(hiddenAppThreshold);
		@@ -1126,6 +1134,7 @@ public class ActivityManager {

		public void readFromParcel(Parcel source) {
		availMem = source.readLong();
		totalMem = source.readLong();
		threshold = source.readLong();
		lowMemory = source.readInt() != 0;
		hiddenAppThreshold = source.readLong();

core/java/android/os/Process.java

+3 −0

Original line number	Diff line number	Diff line
		@@ -896,6 +896,9 @@ public class Process {
		/** @hide */
		public static final native long getFreeMemory();

		/** @hide */
		public static final native long getTotalMemory();

		/** @hide */
		public static final native void readProcLines(String path,
		String[] reqFields, long[] outSizes);

core/jni/android_util_Process.cpp

+17 −5

Original line number	Diff line number	Diff line
		@@ -402,7 +402,7 @@ static int pid_compare(const void* v1, const void* v2)
		return ((const jint)v1) - ((const jint)v2);
		}

		static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz)
		static jlong getFreeMemoryImpl(const char* const sums[], const int sumsLen[], int num)
		{
		int fd = open("/proc/meminfo", O_RDONLY);

		@@ -424,11 +424,8 @@ static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz)
		int numFound = 0;
		jlong mem = 0;

		static const char* const sums[] = { "MemFree:", "Cached:", NULL };
		static const int sumsLen[] = { strlen("MemFree:"), strlen("Cached:"), 0 };

		char* p = buffer;
		while (*p && numFound < 2) {
		while (*p && numFound < num) {
		int i = 0;
		while (sums[i]) {
		if (strncmp(p, sums[i], sumsLen[i]) == 0) {
		@@ -453,6 +450,20 @@ static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz)
		return numFound > 0 ? mem : -1;
		}

		static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz)
		{
		static const char* const sums[] = { "MemFree:", "Cached:", NULL };
		static const int sumsLen[] = { strlen("MemFree:"), strlen("Cached:"), 0 };
		return getFreeMemoryImpl(sums, sumsLen, 2);
		}

		static jlong android_os_Process_getTotalMemory(JNIEnv* env, jobject clazz)
		{
		static const char* const sums[] = { "MemTotal:", NULL };
		static const int sumsLen[] = { strlen("MemTotal:"), 0 };
		return getFreeMemoryImpl(sums, sumsLen, 1);
		}

		void android_os_Process_readProcLines(JNIEnv* env, jobject clazz, jstring fileStr,
		jobjectArray reqFields, jlongArray outFields)
		{
		@@ -901,6 +912,7 @@ static const JNINativeMethod methods[] = {
		{"sendSignal", "(II)V", (void*)android_os_Process_sendSignal},
		{"sendSignalQuiet", "(II)V", (void*)android_os_Process_sendSignalQuiet},
		{"getFreeMemory", "()J", (void*)android_os_Process_getFreeMemory},
		{"getTotalMemory", "()J", (void*)android_os_Process_getTotalMemory},
		{"readProcLines", "(Ljava/lang/String;[Ljava/lang/String;[J)V", (void*)android_os_Process_readProcLines},
		{"getPids", "(Ljava/lang/String;[I)[I", (void*)android_os_Process_getPids},
		{"readProcFile", "(Ljava/lang/String;[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_readProcFile},

services/java/com/android/server/am/ActivityManagerService.java

+1 −0

Original line number	Diff line number	Diff line
		@@ -5360,6 +5360,7 @@ public final class ActivityManagerService extends ActivityManagerNative
		final long homeAppMem = mProcessList.getMemLevel(ProcessList.HOME_APP_ADJ);
		final long hiddenAppMem = mProcessList.getMemLevel(ProcessList.HIDDEN_APP_MIN_ADJ);
		outInfo.availMem = Process.getFreeMemory();
		outInfo.totalMem = Process.getTotalMemory();
		outInfo.threshold = homeAppMem;
		outInfo.lowMemory = outInfo.availMem < (homeAppMem + ((hiddenAppMem-homeAppMem)/2));
		outInfo.hiddenAppThreshold = hiddenAppMem;