From 8ae7c22972d82b14d7308e16c26389fa4412727f Mon Sep 17 00:00:00 2001
From: Kunshan Wang <wks1986@gmail.com>
Date: Tue, 19 Nov 2024 16:07:22 +0800
Subject: Annotate anonymous mmap

Use PR_SET_VMA_ANON_NAME to set human-readable names for anonymous
virtual memory areas mapped by `mmap()` when compiled and run on Linux
5.17 or higher.  This makes it convenient for developers to debug mmap.
---
 io_buffer.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'io_buffer.c')

diff --git a/io_buffer.c b/io_buffer.c
index 64715cbc6c..19c755474a 100644
--- a/io_buffer.c
+++ b/io_buffer.c
@@ -16,6 +16,7 @@
 #include "internal/array.h"
 #include "internal/bits.h"
 #include "internal/error.h"
+#include "internal/gc.h"
 #include "internal/numeric.h"
 #include "internal/string.h"
 #include "internal/io.h"
@@ -83,6 +84,8 @@ io_buffer_map_memory(size_t size, int flags)
     if (base == MAP_FAILED) {
         rb_sys_fail("io_buffer_map_memory:mmap");
     }
+
+    ruby_annotate_mmap(base, size, "Ruby:io_buffer_map_memory");
 #endif
 
     return base;
-- 
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