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Date: Mon, 12 Feb 2024 13:39:07 -0800
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Subject: [PATCH v3 21/35] mm/slab: add allocation accounting into slab
 allocation and free paths
From: Suren Baghdasaryan <surenb@google.com>
To: akpm@linux-foundation.org
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Content-Type: text/plain; charset="UTF-8"

Account slab allocations using codetag reference embedded into slabobj_ext.

Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Co-developed-by: Kent Overstreet <kent.overstreet@linux.dev>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
---
 mm/slab.h | 26 ++++++++++++++++++++++++++
 mm/slub.c |  5 +++++
 2 files changed, 31 insertions(+)

diff --git a/mm/slab.h b/mm/slab.h
index 224a4b2305fb..c4bd0d5348cb 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -629,6 +629,32 @@ prepare_slab_obj_exts_hook(struct kmem_cache *s, gfp_t flags, void *p)
 
 #endif /* CONFIG_SLAB_OBJ_EXT */
 
+#ifdef CONFIG_MEM_ALLOC_PROFILING
+
+static inline void alloc_tagging_slab_free_hook(struct kmem_cache *s, struct slab *slab,
+					void **p, int objects)
+{
+	struct slabobj_ext *obj_exts;
+	int i;
+
+	obj_exts = slab_obj_exts(slab);
+	if (!obj_exts)
+		return;
+
+	for (i = 0; i < objects; i++) {
+		unsigned int off = obj_to_index(s, slab, p[i]);
+
+		alloc_tag_sub(&obj_exts[off].ref, s->size);
+	}
+}
+
+#else
+
+static inline void alloc_tagging_slab_free_hook(struct kmem_cache *s, struct slab *slab,
+					void **p, int objects) {}
+
+#endif /* CONFIG_MEM_ALLOC_PROFILING */
+
 #ifdef CONFIG_MEMCG_KMEM
 void mod_objcg_state(struct obj_cgroup *objcg, struct pglist_data *pgdat,
 		     enum node_stat_item idx, int nr);
diff --git a/mm/slub.c b/mm/slub.c
index 9fd96238ed39..f4d5794c1e86 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3821,6 +3821,11 @@ void slab_post_alloc_hook(struct kmem_cache *s,	struct obj_cgroup *objcg,
 					 s->flags, init_flags);
 		kmsan_slab_alloc(s, p[i], init_flags);
 		obj_exts = prepare_slab_obj_exts_hook(s, flags, p[i]);
+#ifdef CONFIG_MEM_ALLOC_PROFILING
+		/* obj_exts can be allocated for other reasons */
+		if (likely(obj_exts) && mem_alloc_profiling_enabled())
+			alloc_tag_add(&obj_exts->ref, current->alloc_tag, s->size);
+#endif
 	}
 
 	memcg_slab_post_alloc_hook(s, objcg, flags, size, p);
-- 
2.43.0.687.g38aa6559b0-goog