From 7d7fc69355e6f5421cf09f93290270bb16d13182 Mon Sep 17 00:00:00 2001
From: Matthias Baesken <mbaesken@openjdk.org>
Date: Wed, 11 Jun 2025 13:32:57 +0000
Subject: [PATCH] 8357570: [macOS] os::Bsd::available_memory() might return too
 low values

Reviewed-by: clanger, mdoerr, lucy
---
 src/hotspot/os/bsd/os_bsd.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/hotspot/os/bsd/os_bsd.cpp b/src/hotspot/os/bsd/os_bsd.cpp
index 9f77d5a4bde..6f7d9a6de37 100644
--- a/src/hotspot/os/bsd/os_bsd.cpp
+++ b/src/hotspot/os/bsd/os_bsd.cpp
@@ -154,7 +154,8 @@ julong os::Bsd::available_memory() {
   assert(kerr == KERN_SUCCESS,
          "host_statistics64 failed - check mach_host_self() and count");
   if (kerr == KERN_SUCCESS) {
-    available = vmstat.free_count * os::vm_page_size();
+    // free_count is just a lowerbound, other page categories can be freed too and make memory available
+    available = (vmstat.free_count + vmstat.inactive_count + vmstat.purgeable_count) * os::vm_page_size();
   }
 #endif
   return available;