Add new API to get free memory (bcf0f2fc) · Commits · e / os / android_frameworks_base

core/api/current.txt

+1 −0

Original line number	Diff line number	Diff line
		@@ -4863,6 +4863,7 @@ package android.app {
		field @NonNull public static final android.os.Parcelable.Creator<android.app.ActivityManager.MemoryInfo> CREATOR;
		field public long advertisedMem;
		field public long availMem;
		field @FlaggedApi("android.app.get_free_memory") public long freeMem;
		field public boolean lowMemory;
		field public long threshold;
		field public long totalMem;

core/java/android/app/ActivityManager.java

+12 −0

Original line number	Diff line number	Diff line
		@@ -3440,6 +3440,15 @@ public class ActivityManager {
		*/
		public long availMem;

		/**
		* The free memory on the system. This is the unused RAM size of the
		* device. Unlike {@link #availMem}, it's a basic snapshot of free RAM,
		* not accounting for reclaimable memory.
		*/
		@FlaggedApi(Flags.FLAG_GET_FREE_MEMORY)
		@SuppressLint("MutableBareField")
		public long freeMem;

		/**
		* The total memory accessible by the kernel. This is basically the
		* RAM size of the device, not including below-kernel fixed allocations
		@@ -3483,6 +3492,7 @@ public class ActivityManager {
		public void writeToParcel(Parcel dest, int flags) {
		dest.writeLong(advertisedMem);
		dest.writeLong(availMem);
		dest.writeLong(freeMem);
		dest.writeLong(totalMem);
		dest.writeLong(threshold);
		dest.writeInt(lowMemory ? 1 : 0);
		@@ -3495,6 +3505,7 @@ public class ActivityManager {
		public void readFromParcel(Parcel source) {
		advertisedMem = source.readLong();
		availMem = source.readLong();
		freeMem = source.readLong();
		totalMem = source.readLong();
		threshold = source.readLong();
		lowMemory = source.readInt() != 0;
		@@ -3508,6 +3519,7 @@ public class ActivityManager {
		public void copyTo(MemoryInfo other) {
		other.advertisedMem = advertisedMem;
		other.availMem = availMem;
		other.freeMem = freeMem;
		other.totalMem = totalMem;
		other.threshold = threshold;
		other.lowMemory = lowMemory;

core/java/android/app/activity_manager.aconfig

+8 −0

Original line number	Diff line number	Diff line
		@@ -171,3 +171,11 @@ flag {
		purpose: PURPOSE_BUGFIX
		}
		}

		flag {
		namespace: "desktop_serviceability"
		name: "get_free_memory"
		is_exported: true
		description: "Add API to get free memory."
		bug: "417906997"
		}

core/java/android/os/Process.java

+9 −0

Original line number	Diff line number	Diff line
		@@ -1494,6 +1494,15 @@ public class Process {
		}

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

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

		/**
		* This function returns available memory. Use getMemAvailable instead.
		* @hide
		*/
		@UnsupportedAppUsage
		public static final native long getFreeMemory();

core/jni/android_util_Process.cpp

+17 −11

Original line number	Diff line number	Diff line
		@@ -678,18 +678,14 @@ 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)
		{
		std::array<std::string_view, 1> memFreeTags = {
		::android::meminfo::SysMemInfo::kMemAvailable,
		};
		std::vector<uint64_t> mem(memFreeTags.size());
		static jlong android_os_Process_getMemory(JNIEnv* env, jobject clazz, std::string_view tag) {
		std::array<std::string_view, 1> memTags = {tag};
		std::vector<uint64_t> mem(memTags.size());
		::android::meminfo::SysMemInfo smi;

		if (!smi.ReadMemInfo(memFreeTags.size(),
		memFreeTags.data(),
		mem.data())) {
		jniThrowRuntimeException(env, "SysMemInfo read failed to get Free Memory");
		if (!smi.ReadMemInfo(memTags.size(), memTags.data(), mem.data())) {
		jniThrowRuntimeException(env,
		("SysMemInfo read failed to get " + std::string(tag)).c_str());
		return -1L;
		}

		@@ -698,6 +694,14 @@ static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz)
		return sum * 1024;
		}

		static jlong android_os_Process_getAvailableMemory(JNIEnv* env, jobject clazz) {
		return android_os_Process_getMemory(env, clazz, ::android::meminfo::SysMemInfo::kMemAvailable);
		}

		static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz) {
		return android_os_Process_getMemory(env, clazz, ::android::meminfo::SysMemInfo::kMemFree);
		}

		static jlong android_os_Process_getTotalMemory(JNIEnv* env, jobject clazz)
		{
		struct sysinfo si;
		@@ -1424,7 +1428,9 @@ static const JNINativeMethod methods[] = {
		{"sendTgSignalThrows", "(III)V", (void*)android_os_Process_sendTgSignalThrows},
		{"setProcessFrozen", "(IIZ)V", (void*)android_os_Process_setProcessFrozen},
		{"isProcessFrozen", "(II)Z", (void*)android_os_Process_isProcessFrozen},
		{"getFreeMemory", "()J", (void*)android_os_Process_getFreeMemory},
		{"getFreeMemory", "()J", (void*)android_os_Process_getAvailableMemory},
		{"getMemAvailable", "()J", (void*)android_os_Process_getAvailableMemory},
		{"getMemFree", "()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},