From 3591ba8578b5eff96c13afc6fdfcf95a96083761 Mon Sep 17 00:00:00 2001
From: Yoshiya Hinosawa <stibium121@gmail.com>
Date: Thu, 30 Nov 2023 22:06:01 +0900
Subject: fix(ext/node): fix os.freemem (#21347)

---
 ext/node/polyfills/os.ts | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'ext/node')

diff --git a/ext/node/polyfills/os.ts b/ext/node/polyfills/os.ts
index 06de4ad44..d1f5e7bfa 100644
--- a/ext/node/polyfills/os.ts
+++ b/ext/node/polyfills/os.ts
@@ -159,7 +159,14 @@ export function endianness(): "BE" | "LE" {
 
 /** Return free memory amount */
 export function freemem(): number {
-  return Deno.systemMemoryInfo().free;
+  if (Deno.build.os === "linux") {
+    // On linux, use 'available' memory
+    // https://github.com/libuv/libuv/blob/a5c01d4de3695e9d9da34cfd643b5ff0ba582ea7/src/unix/linux.c#L2064
+    return Deno.systemMemoryInfo().available;
+  } else {
+    // Use 'free' memory on other platforms
+    return Deno.systemMemoryInfo().free;
+  }
 }
 
 /** Not yet implemented */
-- 
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