From 60fa4a9e232317217aaf8bb956079f6b8c79fb28 Mon Sep 17 00:00:00 2001
From: Kent Overstreet <kent.overstreet@linux.dev>
Date: Thu, 21 Mar 2024 09:36:50 -0700
Subject: mm: percpu: add codetag reference into pcpuobj_ext
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To store codetag for every per-cpu allocation, a codetag reference is
embedded into pcpuobj_ext when CONFIG_MEM_ALLOC_PROFILING=y.  Hooks to use
the newly introduced codetag are added.

Link: https://lkml.kernel.org/r/20240321163705.3067592-29-surenb@google.com
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Tested-by: Kees Cook <keescook@chromium.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Alex Gaynor <alex.gaynor@gmail.com>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Andreas Hindborg <a.hindborg@samsung.com>
Cc: Benno Lossin <benno.lossin@proton.me>
Cc: "Björn Roy Baron" <bjorn3_gh@protonmail.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Gary Guo <gary@garyguo.net>
Cc: Miguel Ojeda <ojeda@kernel.org>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Wedson Almeida Filho <wedsonaf@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 mm/percpu-internal.h | 11 +++++++++--
 mm/percpu.c          | 26 ++++++++++++++++++++++++++
 2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/mm/percpu-internal.h b/mm/percpu-internal.h
index e62d582f4bf3..7e42f0ca3b7b 100644
--- a/mm/percpu-internal.h
+++ b/mm/percpu-internal.h
@@ -36,9 +36,12 @@ struct pcpuobj_ext {
 #ifdef CONFIG_MEMCG_KMEM
 	struct obj_cgroup	*cgroup;
 #endif
+#ifdef CONFIG_MEM_ALLOC_PROFILING
+	union codetag_ref	tag;
+#endif
 };
 
-#ifdef CONFIG_MEMCG_KMEM
+#if defined(CONFIG_MEMCG_KMEM) || defined(CONFIG_MEM_ALLOC_PROFILING)
 #define NEED_PCPUOBJ_EXT
 #endif
 
@@ -86,7 +89,11 @@ struct pcpu_chunk {
 
 static inline bool need_pcpuobj_ext(void)
 {
-	return !mem_cgroup_kmem_disabled();
+	if (IS_ENABLED(CONFIG_MEM_ALLOC_PROFILING))
+		return true;
+	if (!mem_cgroup_kmem_disabled())
+		return true;
+	return false;
 }
 
 extern spinlock_t pcpu_lock;
diff --git a/mm/percpu.c b/mm/percpu.c
index 2e5edaad9cc3..90e9e4004ac9 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1699,6 +1699,32 @@ static void pcpu_memcg_free_hook(struct pcpu_chunk *chunk, int off, size_t size)
 }
 #endif /* CONFIG_MEMCG_KMEM */
 
+#ifdef CONFIG_MEM_ALLOC_PROFILING
+static void pcpu_alloc_tag_alloc_hook(struct pcpu_chunk *chunk, int off,
+				      size_t size)
+{
+	if (mem_alloc_profiling_enabled() && likely(chunk->obj_exts)) {
+		alloc_tag_add(&chunk->obj_exts[off >> PCPU_MIN_ALLOC_SHIFT].tag,
+			      current->alloc_tag, size);
+	}
+}
+
+static void pcpu_alloc_tag_free_hook(struct pcpu_chunk *chunk, int off, size_t size)
+{
+	if (mem_alloc_profiling_enabled() && likely(chunk->obj_exts))
+		alloc_tag_sub(&chunk->obj_exts[off >> PCPU_MIN_ALLOC_SHIFT].tag, size);
+}
+#else
+static void pcpu_alloc_tag_alloc_hook(struct pcpu_chunk *chunk, int off,
+				      size_t size)
+{
+}
+
+static void pcpu_alloc_tag_free_hook(struct pcpu_chunk *chunk, int off, size_t size)
+{
+}
+#endif
+
 /**
  * pcpu_alloc - the percpu allocator
  * @size: size of area to allocate in bytes
-- 
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