util/HugeAllocator: add SetName()

src/util/HugeAllocator.cxx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2021 Max Kellermann <max.kellermann@gmail.com>
+ * Copyright 2013-2022 Max Kellermann <max.kellermann@gmail.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -28,6 +28,7 @@
  */
 
 #include "HugeAllocator.hxx"
+#include "system/VmaName.hxx"
 
 #include <new>
 
@@ -82,6 +83,12 @@ HugeFree(void *p, size_t size) noexcept
 	munmap(p, AlignToPageSize(size));
 }
 
+void
+HugeSetName(void *p, size_t size, const char *name) noexcept
+{
+	SetVmaName(p, size, name);
+}
+
 void
 HugeForkCow(void *p, size_t size, bool enable) noexcept
 {

src/util/HugeAllocator.hxx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2019 Max Kellermann <max.kellermann@gmail.com>
+ * Copyright 2013-2022 Max Kellermann <max.kellermann@gmail.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -58,6 +58,14 @@ HugeAllocate(size_t size);
 void
 HugeFree(void *p, size_t size) noexcept;
 
+/**
+ * Set a name for the specified virtual memory area.
+ *
+ * This feature requires Linux 5.17.
+ */
+void
+HugeSetName(void *p, size_t size, const char *name) noexcept;
+
 /**
  * Control whether this allocation is copied to newly forked child
  * processes.  Disabling that makes forking a little bit cheaper.
@@ -88,6 +96,11 @@ HugeFree(void *p, size_t) noexcept
 	VirtualFree(p, 0, MEM_RELEASE);
 }
 
+static inline void
+HugeSetName(void *, size_t, const char *) noexcept
+{
+}
+
 static inline void
 HugeForkCow(void *, size_t, bool) noexcept
 {
@@ -118,6 +131,11 @@ HugeFree(void *_p, size_t) noexcept
 	delete[] p;
 }
 
+static inline void
+HugeSetName(void *, size_t, const char *) noexcept
+{
+}
+
 static inline void
 HugeForkCow(void *, size_t, bool) noexcept
 {
@@ -167,6 +185,11 @@ public:
 		return *this;
 	}
 
+	void SetName(const char *name) noexcept {
+		const auto v = buffer.ToVoid();
+		HugeSetName(v.data, v.size, name);
+	}
+
 	void ForkCow(bool enable) noexcept {
 		auto v = buffer.ToVoid();
 		HugeForkCow(v.data, v.size, enable);

src/util/SliceBuffer.hxx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2021 The Music Player Daemon Project
+ * Copyright 2003-2022 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -85,6 +85,10 @@ public:
 		return n_allocated == buffer.size();
 	}
 
+	void SetName(const char *name) noexcept {
+		buffer.SetName(name);
+	}
+
 	void DiscardMemory() noexcept {
 		assert(empty());
 

src/util/SparseBuffer.hxx

@@ -112,6 +112,10 @@ public:
 		return map.size();
 	}
 
+	void SetName(const char *name) noexcept {
+		buffer.SetName(name);
+	}
+
 	struct ReadResult {
 		size_type undefined_size;
 		ConstBuffer<T> defined_buffer;