Thread (60 messages) 60 messages, 8 authors, 2024-03-15

Re: [PATCH v5 23/37] mm/slab: add allocation accounting into slab allocation and free paths

From: Vlastimil Babka <hidden>
Date: 2024-03-15 10:58:55
Also in: cgroups, linux-arch, linux-doc, linux-fsdevel, linux-iommu, linux-mm, lkml

On 3/6/24 19:24, Suren Baghdasaryan wrote:
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>
Reviewed-by: Kees Cook <redacted>
Reviewed-by: Vlastimil Babka <redacted>

Nit below:
quoted hunk ↗ jump to hunk
@@ -3833,6 +3913,7 @@ void slab_post_alloc_hook(struct kmem_cache *s,	struct obj_cgroup *objcg,
 			  unsigned int orig_size)
 {
 	unsigned int zero_size = s->object_size;
+	struct slabobj_ext *obj_exts;
 	bool kasan_init = init;
 	size_t i;
 	gfp_t init_flags = flags & gfp_allowed_mask;
@@ -3875,6 +3956,12 @@ void slab_post_alloc_hook(struct kmem_cache *s,	struct obj_cgroup *objcg,
 		kmemleak_alloc_recursive(p[i], s->object_size, 1,
 					 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
I think you could still do this a bit better:

Check mem_alloc_profiling_enabled() once before the whole block calling
prepare_slab_obj_exts_hook() and alloc_tag_add()
Remove need_slab_obj_ext() check from prepare_slab_obj_exts_hook()
quoted hunk ↗ jump to hunk
 	}
 
 	memcg_slab_post_alloc_hook(s, objcg, flags, size, p);
@@ -4353,6 +4440,7 @@ void slab_free(struct kmem_cache *s, struct slab *slab, void *object,
 	       unsigned long addr)
 {
 	memcg_slab_free_hook(s, slab, &object, 1);
+	alloc_tagging_slab_free_hook(s, slab, &object, 1);
 
 	if (likely(slab_free_hook(s, object, slab_want_init_on_free(s))))
 		do_slab_free(s, slab, object, object, 1, addr);
@@ -4363,6 +4451,7 @@ void slab_free_bulk(struct kmem_cache *s, struct slab *slab, void *head,
 		    void *tail, void **p, int cnt, unsigned long addr)
 {
 	memcg_slab_free_hook(s, slab, p, cnt);
+	alloc_tagging_slab_free_hook(s, slab, p, cnt);
 	/*
 	 * With KASAN enabled slab_free_freelist_hook modifies the freelist
 	 * to remove objects, whose reuse must be delayed.
  
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