From a944c422cca5522073e03710ca7fd08f53218358 Mon Sep 17 00:00:00 2001
From: Christian Guinard <28689358+christiangnrd@users.noreply.github.com>
Date: Wed, 15 Oct 2025 03:35:42 -0300
Subject: [PATCH] darwin: better heuristic for available memory (#4908)

Fixes: https://github.com/libuv/libuv/issues/3897
---
 src/unix/darwin.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/unix/darwin.c b/src/unix/darwin.c
index 009efbefa..98ddf2728 100644
--- a/src/unix/darwin.c
+++ b/src/unix/darwin.c
@@ -126,7 +126,15 @@ uint64_t uv_get_constrained_memory(void) {
 
 
 uint64_t uv_get_available_memory(void) {
-  return uv_get_free_memory();
+  vm_statistics_data_t info;
+  mach_msg_type_number_t count = sizeof(info) / sizeof(integer_t);
+
+  if (host_statistics(mach_host_self(), HOST_VM_INFO,
+                      (host_info_t)&info, &count) != KERN_SUCCESS) {
+    return 0;
+  }
+
+  return ((uint64_t) info.free_count + (uint64_t) info.inactive_count + (uint64_t) info.purgeable_count) * sysconf(_SC_PAGESIZE);
 }