From a80f970853e67a52e63b5082fe1a8a578584fc19 Mon Sep 17 00:00:00 2001
From: Radim Vansa <rvansa@redhat.com>
Date: Fri, 27 Sep 2019 13:17:21 +0200
Subject: [PATCH] #4241 100% CPU in epoll_wait

---
 .../netty/deployment/NettyProcessor.java      |  7 +++++
 .../runtime/graal/NettySubstitutions.java     | 28 +++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/extensions/netty/deployment/src/main/java/io/quarkus/netty/deployment/NettyProcessor.java b/extensions/netty/deployment/src/main/java/io/quarkus/netty/deployment/NettyProcessor.java
index bcea7cd28640f..eb1906619745a 100644
--- a/extensions/netty/deployment/src/main/java/io/quarkus/netty/deployment/NettyProcessor.java
+++ b/extensions/netty/deployment/src/main/java/io/quarkus/netty/deployment/NettyProcessor.java
@@ -18,6 +18,7 @@
 import io.quarkus.deployment.builditem.JniBuildItem;
 import io.quarkus.deployment.builditem.SystemPropertyBuildItem;
 import io.quarkus.deployment.builditem.substrate.ReflectiveClassBuildItem;
+import io.quarkus.deployment.builditem.substrate.RuntimeReinitializedClassBuildItem;
 import io.quarkus.deployment.builditem.substrate.SubstrateConfigBuildItem;
 import io.quarkus.deployment.builditem.substrate.SubstrateSystemPropertyBuildItem;
 import io.quarkus.netty.BossEventLoopGroup;
@@ -162,4 +163,10 @@ void createExecutors(BuildProducer<RuntimeBeanBuildItem> runtimeBeanBuildItemBui
                 .build());
     }
 
+    @BuildStep
+    public RuntimeReinitializedClassBuildItem reinitScheduledFutureTask() {
+        return new RuntimeReinitializedClassBuildItem(
+                "io.quarkus.netty.runtime.graal.Holder_io_netty_util_concurrent_ScheduledFutureTask");
+    }
+
 }
diff --git a/extensions/netty/runtime/src/main/java/io/quarkus/netty/runtime/graal/NettySubstitutions.java b/extensions/netty/runtime/src/main/java/io/quarkus/netty/runtime/graal/NettySubstitutions.java
index da0521e7f6eea..27b179bb9a75e 100644
--- a/extensions/netty/runtime/src/main/java/io/quarkus/netty/runtime/graal/NettySubstitutions.java
+++ b/extensions/netty/runtime/src/main/java/io/quarkus/netty/runtime/graal/NettySubstitutions.java
@@ -12,6 +12,7 @@
 import javax.net.ssl.TrustManagerFactory;
 
 import com.oracle.svm.core.annotate.Alias;
+import com.oracle.svm.core.annotate.Delete;
 import com.oracle.svm.core.annotate.RecomputeFieldValue;
 import com.oracle.svm.core.annotate.Substitute;
 import com.oracle.svm.core.annotate.TargetClass;
@@ -333,6 +334,33 @@ final class Target_io_netty_util_AbstractReferenceCounted {
     private static long REFCNT_FIELD_OFFSET;
 }
 
+// This class is runtime-initialized by NettyProcessor
+final class Holder_io_netty_util_concurrent_ScheduledFutureTask {
+    static final long START_TIME = System.nanoTime();
+}
+
+@TargetClass(className = "io.netty.util.concurrent.ScheduledFutureTask")
+final class Target_io_netty_util_concurrent_ScheduledFutureTask {
+    @Delete
+    public static long START_TIME = 0;
+
+    @Substitute
+    static long nanoTime() {
+        return System.nanoTime() - Holder_io_netty_util_concurrent_ScheduledFutureTask.START_TIME;
+    }
+
+    @Alias
+    public long deadlineNanos() {
+        return 0;
+    }
+
+    @Substitute
+    public long delayNanos(long currentTimeNanos) {
+        return Math.max(0,
+                deadlineNanos() - (currentTimeNanos - Holder_io_netty_util_concurrent_ScheduledFutureTask.START_TIME));
+    }
+}
+
 class NettySubstitutions {
 
 }