aa52bf9e33
Mojang made some changes to priorities in 1.17 and it seems that these changes conflict with the changes made in this patch, which in some cases appears to cause excessive rescheduling of tasks. This, however, is not confirmed as such but seems to be the behavior that we're seeing to cause this issue, if mojang has adopted the changes we suggested, then a good chunk of this patch may be unneeded, but, this needs a much better look than I'm currently able to do
55 lines
2.3 KiB
Diff
55 lines
2.3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Wyatt Childers <wchilders@nearce.com>
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Date: Sat, 4 Jul 2020 23:07:43 -0400
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Subject: [PATCH] Optimize the advancement data player iteration to be O(N)
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rather than O(N^2)
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diff --git a/src/main/java/net/minecraft/server/PlayerAdvancements.java b/src/main/java/net/minecraft/server/PlayerAdvancements.java
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index 3d82f984648605d58fae3c57f145d0da8a2ae225..ce02a467c1c3434f2cdb112ceb9794196069a820 100644
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--- a/src/main/java/net/minecraft/server/PlayerAdvancements.java
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+++ b/src/main/java/net/minecraft/server/PlayerAdvancements.java
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@@ -437,6 +437,16 @@ public class PlayerAdvancements {
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}
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private void ensureVisibility(Advancement advancement) {
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+ // Paper start
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+ e(advancement, IterationEntryPoint.ROOT);
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+ }
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+ private enum IterationEntryPoint {
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+ ROOT,
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+ ITERATOR,
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+ PARENT_OF_ITERATOR
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+ }
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+ private void e(Advancement advancement, IterationEntryPoint entryPoint) {
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+ // Paper end
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boolean flag = this.shouldBeVisible(advancement);
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boolean flag1 = this.visible.contains(advancement);
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@@ -452,15 +462,23 @@ public class PlayerAdvancements {
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}
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if (flag != flag1 && advancement.getParent() != null) {
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- this.ensureVisibility(advancement.getParent());
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+ // Paper start - If we're not coming from an iterator consider this to be a root entry, otherwise
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+ // market that we're entering from the parent of an iterator.
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+ this.e(advancement.getParent(), entryPoint == IterationEntryPoint.ITERATOR ? IterationEntryPoint.PARENT_OF_ITERATOR : IterationEntryPoint.ROOT);
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}
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+ // If this is true, we've went through a child iteration, entered the parent, processed the parent
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+ // and are about to reprocess the children. Stop processing here to prevent O(N^2) processing.
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+ if (entryPoint == IterationEntryPoint.PARENT_OF_ITERATOR) {
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+ return;
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+ } // Paper end
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+
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Iterator iterator = advancement.getChildren().iterator();
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while (iterator.hasNext()) {
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Advancement advancement1 = (Advancement) iterator.next();
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- this.ensureVisibility(advancement1);
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+ this.e(advancement1, IterationEntryPoint.ITERATOR); // Paper - Mark this call as being from iteration
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}
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}
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