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92 changes: 92 additions & 0 deletions
92
engine/src/main/java/org/terasology/engine/utilities/OperatingSystemMemory.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| // Copyright 2021 The Terasology Foundation | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
|
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| package org.terasology.engine.utilities; | ||
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| import com.sun.jna.platform.unix.LibC; | ||
|
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| import java.io.IOException; | ||
| import java.io.UncheckedIOException; | ||
| import java.nio.file.Files; | ||
| import java.nio.file.Path; | ||
|
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| /** | ||
| * Monitor process memory usage. | ||
| * <p> | ||
| * This checks process's total memory usage as seen by the operating system. | ||
| * This includes memory not managed by the JVM. | ||
| */ | ||
| public final class OperatingSystemMemory { | ||
| public static final int PAGE_SIZE = 1 << 12; // 4 kB on x86 platforms | ||
|
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| private static final Path PROC_STATM = Path.of("/proc/self/statm"); | ||
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| private OperatingSystemMemory() { } | ||
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| public static boolean isAvailable() { | ||
| return OS.IS_LINUX; | ||
| } | ||
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| public static long residentSetSize() { | ||
| try { | ||
| return STATM.RESIDENT.inBytes(Files.readString(PROC_STATM)); | ||
| } catch (IOException e) { | ||
| throw new UncheckedIOException(e); | ||
| } | ||
| } | ||
|
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| public static long dataAndStackSize() { | ||
| try { | ||
| return STATM.DATA.inBytes(Files.readString(PROC_STATM)); | ||
| } catch (IOException e) { | ||
| throw new UncheckedIOException(e); | ||
| } | ||
| } | ||
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| public static long dataAndStackSizeLimit() { | ||
| final LibC.Rlimit dataLimit = new LibC.Rlimit(); | ||
| LibC.INSTANCE.getrlimit(LibC.RLIMIT_DATA, dataLimit); | ||
| return dataLimit.rlim_cur; | ||
| } | ||
|
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| /** | ||
| * The fields of /proc/[pid]/statm | ||
| * <p> | ||
| * Note from proc(5): | ||
| * <blockquote><p> | ||
| * Some of these values are inaccurate because of a kernel-internal scalability optimization. | ||
| * If accurate values are required, use /proc/[pid]/smaps or /proc/[pid]/smaps_rollup instead, | ||
| * which are much slower but provide accurate, detailed information. | ||
| * </p></blockquote> | ||
| */ | ||
| enum STATM { | ||
| /** total program size */ | ||
| SIZE(0), | ||
| /** resident set size */ | ||
| RESIDENT(1), | ||
| /** number of resident shared pages */ | ||
| SHARED(2), | ||
| /** text (code) */ | ||
| TEXT(3), | ||
| /** unused since Linux 2.6 */ | ||
| LIB(4), | ||
| /** data + stack */ | ||
| DATA(5), | ||
| /** unused since Linux 2.6 */ | ||
| DT(6); | ||
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| private final short index; | ||
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| STATM(int i) { | ||
| index = (short) i; | ||
| } | ||
|
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| public long rawValue(String line) { | ||
| return Long.parseLong(line.split(" ")[index]); | ||
| } | ||
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| public long inBytes(String line) { | ||
| return rawValue(line) * PAGE_SIZE; | ||
| } | ||
| } | ||
| } |