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Update ScheduledTaskThreadPool

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1. Adjust insertion last task process time to be the current time.
   This makes fresh inserts to be scheduled fairly with current
   inserts.
2. Always attempt to watch global first task
   This should try to prevent multiple scheduler threads from
   waiting on the same task. If the global first task is our task,
   then we can avoid retrying for the next task.
3. Correctly set runner state to TASKS when parsing intermediate
   tasks. This will prevent the runner from being interrupted
   by notifyTasks.
This commit is contained in:
Spottedleaf 2025-03-21 08:36:05 -07:00
parent 7452818d16
commit 8822da77b7
1 changed files with 20 additions and 14 deletions
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34
folia-server/minecraft-patches/features/0009-fixup-Region-Threading-Base.patch
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@ -396,10 +396,10 @@ index c6e487a4c14e6b82533881d01f32349b9ae28728..b8f1f042342d3fed5fa26df0de07e8e2
}
diff --git a/io/papermc/paper/threadedregions/ScheduledTaskThreadPool.java b/io/papermc/paper/threadedregions/ScheduledTaskThreadPool.java
new file mode 100644
index 0000000000000000000000000000000000000000..1525be087f2b021e9ba4c1489d2144c1df90761d
index 0000000000000000000000000000000000000000..c7627ababadf72231682baa9c056a4082170410a
--- /dev/null
+++ b/io/papermc/paper/threadedregions/ScheduledTaskThreadPool.java
@@ -0,0 +1,1158 @@
@@ -0,0 +1,1164 @@
+package io.papermc.paper.threadedregions;
+
+import ca.spottedleaf.concurrentutil.util.ConcurrentUtil;
@ -638,7 +638,6 @@ index 0000000000000000000000000000000000000000..1525be087f2b021e9ba4c1489d2144c1
+ private void insert(final SchedulableTick tick, final boolean hasTasks) {
+ final long scheduleTime = tick.getScheduledStart();
+ final long timeNow = System.nanoTime();
+ final long nextTaskProcess = timeNow + (this.taskTimeSliceNS >>> 1);
+
+ for (;;) {
+ final Map.Entry<WaitState, WaitState> lastIdle = this.waitingOrIdleRunners.firstEntry();
@ -651,7 +650,7 @@ index 0000000000000000000000000000000000000000..1525be087f2b021e9ba4c1489d2144c1
+ tick,
+ // offset start by steal threshold so that it will hopefully start at its scheduled time
+ scheduleTime - this.stealThresholdNS,
+ nextTaskProcess,
+ timeNow,
+ null
+ );
+
@ -672,7 +671,7 @@ index 0000000000000000000000000000000000000000..1525be087f2b021e9ba4c1489d2144c1
+ continue;
+ }
+
+ final ScheduledTickTask task = tick.task = new ScheduledTickTask(tick, scheduleTime, nextTaskProcess, waitState.runner);
+ final ScheduledTickTask task = tick.task = new ScheduledTickTask(tick, scheduleTime, timeNow, waitState.runner);
+
+ this.unwatchedScheduledTicks.put(task, task);
+ waitState.runner.scheduledTicks.put(task, task);
@ -1226,12 +1225,13 @@ index 0000000000000000000000000000000000000000..1525be087f2b021e9ba4c1489d2144c1
+ return toWaitFor;
+ }
+
+ if (toWaitFor == globalFirst && globalFirst != ourFirst) {
+ if (!toWaitFor.watch()) {
+ if (toWaitFor == globalFirst) {
+ if (toWaitFor.watch()) {
+ this.scheduler.unwatchedScheduledTicks.remove(toWaitFor);
+ this.watch = toWaitFor;
+ } else if (toWaitFor != ourFirst) {
+ continue;
+ }
+ this.scheduler.unwatchedScheduledTicks.remove(toWaitFor);
+ this.watch = toWaitFor;
+ } // else: failed to watch, but we are waiting for our task
+ }
+
+ return toWaitFor;
@ -1261,7 +1261,6 @@ index 0000000000000000000000000000000000000000..1525be087f2b021e9ba4c1489d2144c1
+ }
+ break;
+ }
+
+ }
+ }
+ }
@ -1286,11 +1285,10 @@ index 0000000000000000000000000000000000000000..1525be087f2b021e9ba4c1489d2144c1
+ }
+
+ private void reinsert(final ScheduledTickTask tick, final TickThreadRunner owner) {
+ final ScheduledTickTask newTask = new ScheduledTickTask(
+ final ScheduledTickTask newTask = tick.tick.task = new ScheduledTickTask(
+ tick.tick, tick.tick.getScheduledStart(), System.nanoTime(), owner
+ );
+
+ newTask.tick.task = newTask;
+ this.scheduler.unwatchedScheduledTicks.put(newTask, newTask);
+ if (owner != null) {
+ owner.scheduledTicks.put(newTask, newTask);
@ -1302,7 +1300,13 @@ index 0000000000000000000000000000000000000000..1525be087f2b021e9ba4c1489d2144c1
+ }
+
+ private void runTasks(final ScheduledTickTask tick, final long deadline) {
+ if (STATE_WAITING != this.compareAndExchangeStateVolatile(STATE_WAITING, STATE_TASKS)) {
+ // interrupted or halted
+ return;
+ }
+
+ if (!tick.take()) {
+ this.compareAndExchangeStateVolatile(STATE_TASKS, STATE_WAITING);
+ return;
+ }
+
@ -1315,12 +1319,14 @@ index 0000000000000000000000000000000000000000..1525be087f2b021e9ba4c1489d2144c1
+ }
+
+ final BooleanSupplier canContinue = () -> {
+ return TickThreadRunner.this.getStateVolatile() == STATE_WAITING && (System.nanoTime() - deadline < 0L);
+ return TickThreadRunner.this.getStateVolatile() == STATE_TASKS && (System.nanoTime() - deadline < 0L);
+ };
+
+ if (tick.tick.tasks(canContinue)) {
+ this.reinsert(tick, tick.owner == null ? this : tick.owner);
+ }
+
+ this.compareAndExchangeStateVolatile(STATE_TASKS, STATE_WAITING);
+ }
+
+ private ScheduledTickTask waitForTick() {