[PATCH v3 21/35] mm/slab: add allocation accounting into slab allocation and free paths
From: Suren Baghdasaryan <surenb@google.com>
Date: 2024-02-12 21:40:19
Also in:
cgroups, linux-arch, linux-doc, linux-fsdevel, linux-iommu, linux-mm, lkml
Subsystem:
memory management, slab allocator, the rest · Maintainers:
Andrew Morton, Vlastimil Babka, Harry Yoo, Linus Torvalds
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