From af9d11eb223a1b8144fdd03c52611525e62c5da8 Mon Sep 17 00:00:00 2001
From: Thomas Stuefe <stuefe@openjdk.org>
Date: Tue, 29 Aug 2023 10:03:54 +0000
Subject: [PATCH] 8314139: TEST_BUG:
 runtime/os/THPsInThreadStackPreventionTest.java could fail on machine with
 large number of cores

Backport-of: 733250288325bc663afc0376342d4c5a7a471cbd
---
 .../jtreg/runtime/os/THPsInThreadStackPreventionTest.java      | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/test/hotspot/jtreg/runtime/os/THPsInThreadStackPreventionTest.java b/test/hotspot/jtreg/runtime/os/THPsInThreadStackPreventionTest.java
index f16c5d66311..4b76468bb74 100644
--- a/test/hotspot/jtreg/runtime/os/THPsInThreadStackPreventionTest.java
+++ b/test/hotspot/jtreg/runtime/os/THPsInThreadStackPreventionTest.java
@@ -165,6 +165,9 @@ public static void main(String[] args) throws Exception {
             "-Xmx" + heapSizeMB + "m", "-Xms" + heapSizeMB + "m", "-XX:+AlwaysPreTouch", // stabilize RSS
             "-Xss" + threadStackSizeMB + "m",
             "-XX:-CreateCoredumpOnCrash",
+            // Limits the number of JVM-internal threads, which depends on the available cores of the
+            // machine. RSS+Swap could exceed acceptableRSSLimitMB when JVM creates many internal threads.
+            "-XX:ActiveProcessorCount=2",
             // This will delay the child threads before they create guard pages, thereby greatly increasing the
             // chance of large VMA formation + hugepage coalescation; see JDK-8312182
             "-XX:+DelayThreadStartALot"