a4ed58a9ab
Java 9+ doesn't allow using the exposed cleanup method, but added a new method on Unsafe to do it. So have to detect java version and use the appropriate strategy.
88 lines
3.6 KiB
Diff
88 lines
3.6 KiB
Diff
From 8fdbc0b6bb68ba8e6f6ce8035c9936e3922808f0 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Mon, 4 May 2020 00:38:13 -0400
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Subject: [PATCH] Cleanup Region Files Direct Memory on close
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Mojang was semi leaking native memory here by relying on finalizers
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to clean up the direct memory.
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Finalizers have no guarantee on when they will be ran, and since this is
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old generation memory, it might be a while before its called.
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diff --git a/src/main/java/net/minecraft/server/RegionFile.java b/src/main/java/net/minecraft/server/RegionFile.java
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index df728e2c0a..20927d55c6 100644
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--- a/src/main/java/net/minecraft/server/RegionFile.java
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+++ b/src/main/java/net/minecraft/server/RegionFile.java
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@@ -30,7 +30,7 @@ public class RegionFile implements AutoCloseable {
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private final FileChannel dataFile;
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private final java.nio.file.Path d;
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private final RegionFileCompression e;
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- private final ByteBuffer f;
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+ private final ByteBuffer f; private ByteBuffer getFileBuffer() { return f; } // Paper - clean up direct buffers on close
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private final IntBuffer g;
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private final IntBuffer h;
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private final RegionFileBitSet freeSectors;
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@@ -403,10 +403,59 @@ public class RegionFile implements AutoCloseable {
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}
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} finally { // Paper start - Prevent regionfiles from being closed during use
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this.fileLock.unlock();
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+ if (getFileBuffer().isDirect()) cleanDirectByteBuffer(getFileBuffer()); // Paper - clean up direct buffers on close
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}
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} // Paper end
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}
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+ // Paper start
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+ private static int getVersion() {
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+ String version = System.getProperty("java.version");
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+ if(version.startsWith("1.")) {
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+ version = version.substring(2, 3);
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+ } else {
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+ int dot = version.indexOf(".");
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+ if(dot != -1) { version = version.substring(0, dot); }
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+ } return Integer.parseInt(version);
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+ }
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+ static java.lang.reflect.Method unsafeClean;
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+ static sun.misc.Unsafe unsafe = com.destroystokyo.paper.utils.UnsafeUtils.getUnsafe();
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+ static java.util.function.Consumer<ByteBuffer> cleaner;
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+ static {
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+ try {
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+ if (unsafe != null) {
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+ unsafeClean = unsafe.getClass().getMethod("invokeCleaner", ByteBuffer.class);
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+ if (unsafeClean != null) {
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+ cleaner = (buf) -> {
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+ try {
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+ unsafeClean.invoke(unsafe, buf);
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+ } catch (Exception ex) {
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+ com.destroystokyo.paper.util.SneakyThrow.sneaky(ex);
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+ }
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+ };
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+ LOGGER.info("[RegionFile] Using Java 9+ invokeCleaner DirectByteBuffer cleanup method");
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+ }
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+ }
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+ } catch (java.lang.NoSuchMethodException e) {}
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+ if (cleaner == null && getVersion() <= 8) {
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+ cleaner = (buf) -> {
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+ ((sun.nio.ch.DirectBuffer) buf).cleaner().clean();
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+ };
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+ LOGGER.info("[RegionFile] Using Java 8 DirectByteBuffer cleanup method");
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+ }
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+ }
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+ public static void cleanDirectByteBuffer(ByteBuffer toBeDestroyed) {
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+ try {
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+ if (cleaner != null) {
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+ cleaner.accept(toBeDestroyed);
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+ }
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+ } catch (Exception ex) {
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+ LOGGER.warn("Failed automatically cleaning DirectByteBuffer");
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+ ex.printStackTrace();
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+ cleaner = null;
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+ }
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+ }
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+ // Paper end
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private void c() throws IOException {
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int i = (int) this.dataFile.size();
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--
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2.26.2
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