From c51a26d40e7f2c6d4f2f826857e46f83fb345e2a 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

---
 .../runtime/graal/NettySubstitutions.java     | 31 +++++++++++++++++++
 1 file changed, 31 insertions(+)

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 3056bc26ab648c..6712e73798b41e 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
@@ -284,6 +284,37 @@ private static Queue<Runnable> newTaskQueue0(int maxPendingTasks) {
     }
 }
 
+final class Holder_io_netty_util_concurrent_ScheduledFutureTask {
+    private static long START_TIME = Long.MIN_VALUE;
+
+    static long startTime() {
+        if (START_TIME == Long.MIN_VALUE) {
+            START_TIME = System.nanoTime();
+        }
+        return START_TIME;
+    }
+}
+
+@TargetClass(className = "io.netty.util.concurrent.ScheduledFutureTask")
+final class Target_io_netty_util_concurrent_ScheduledFutureTask {
+
+    @Substitute
+    static long nanoTime() {
+        return System.nanoTime() - Holder_io_netty_util_concurrent_ScheduledFutureTask.startTime();
+    }
+
+    @Alias
+    public long deadlineNanos() {
+        return 0;
+    }
+
+    @Substitute
+    public long delayNanos(long currentTimeNanos) {
+        return Math.max(0,
+                deadlineNanos() - (currentTimeNanos - Holder_io_netty_util_concurrent_ScheduledFutureTask.startTime()));
+    }
+}
+
 class NettySubstitutions {
 
 }