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Mon, 27 Oct 2025 12:29:11 +0000 Received: from CH3PR10MB7329.namprd10.prod.outlook.com ([fe80::f238:6143:104c:da23]) by CH3PR10MB7329.namprd10.prod.outlook.com ([fe80::f238:6143:104c:da23%5]) with mapi id 15.20.9253.017; Mon, 27 Oct 2025 12:29:11 +0000 From: Harry Yoo To: akpm@linux-foundation.org, vbabka@suse.cz Cc: andreyknvl@gmail.com, cl@linux.com, dvyukov@google.com, glider@google.com, hannes@cmpxchg.org, linux-mm@kvack.org, mhocko@kernel.org, muchun.song@linux.dev, rientjes@google.com, roman.gushchin@linux.dev, ryabinin.a.a@gmail.com, shakeel.butt@linux.dev, surenb@google.com, vincenzo.frascino@arm.com, yeoreum.yun@arm.com, harry.yoo@oracle.com, tytso@mit.edu, adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH V3 3/7] mm/slab: abstract slabobj_ext access via new slab_obj_ext() helper Date: Mon, 27 Oct 2025 21:28:43 +0900 Message-ID: <20251027122847.320924-4-harry.yoo@oracle.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251027122847.320924-1-harry.yoo@oracle.com> References: <20251027122847.320924-1-harry.yoo@oracle.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: SEWP216CA0072.KORP216.PROD.OUTLOOK.COM (2603:1096:101:2bc::9) To CH3PR10MB7329.namprd10.prod.outlook.com (2603:10b6:610:12c::16) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH3PR10MB7329:EE_|MW4PR10MB6371:EE_ X-MS-Office365-Filtering-Correlation-Id: bfbde1da-548d-451f-b446-08de15546e7e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|366016|1800799024; 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charset="utf-8" Currently, the slab allocator assumes that slab->obj_exts is a pointer to an array of struct slabobj_ext objects. However, to support storage methods where struct slabobj_ext is embedded within objects, the slab allocator should not make this assumption. Instead of directly dereferencing the slabobj_exts array, abstract access to struct slabobj_ext via helper functions. Introduce a new API slabobj_ext metadata access: slab_obj_ext(slab, obj_exts, index) - returns the pointer to struct slabobj_ext element at the given index. Directly dereferencing the return value of slab_obj_exts() is no longer allowed. Instead, slab_obj_ext() must always be used to access individual struct slabobj_ext objects. Convert all users to use these APIs. No functional changes intended. Signed-off-by: Harry Yoo --- mm/memcontrol.c | 23 ++++++++++++++++------- mm/slab.h | 43 ++++++++++++++++++++++++++++++++++++------ mm/slub.c | 50 ++++++++++++++++++++++++++++--------------------- 3 files changed, 82 insertions(+), 34 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 8dd7fbed5a94..2a9dc246e802 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -2566,7 +2566,8 @@ struct mem_cgroup *mem_cgroup_from_obj_folio(struct f= olio *folio, void *p) * slab->obj_exts. */ if (folio_test_slab(folio)) { - struct slabobj_ext *obj_exts; + unsigned long obj_exts; + struct slabobj_ext *obj_ext; struct slab *slab; unsigned int off; =20 @@ -2576,8 +2577,9 @@ struct mem_cgroup *mem_cgroup_from_obj_folio(struct f= olio *folio, void *p) return NULL; =20 off =3D obj_to_index(slab->slab_cache, slab, p); - if (obj_exts[off].objcg) - return obj_cgroup_memcg(obj_exts[off].objcg); + obj_ext =3D slab_obj_ext(slab, obj_exts, off); + if (obj_ext->objcg) + return obj_cgroup_memcg(obj_ext->objcg); =20 return NULL; } @@ -3168,6 +3170,9 @@ bool __memcg_slab_post_alloc_hook(struct kmem_cache *= s, struct list_lru *lru, } =20 for (i =3D 0; i < size; i++) { + unsigned long obj_exts; + struct slabobj_ext *obj_ext; + slab =3D virt_to_slab(p[i]); =20 if (!slab_obj_exts(slab) && @@ -3190,29 +3195,33 @@ bool __memcg_slab_post_alloc_hook(struct kmem_cache= *s, struct list_lru *lru, slab_pgdat(slab), cache_vmstat_idx(s))) return false; =20 + obj_exts =3D slab_obj_exts(slab); off =3D obj_to_index(s, slab, p[i]); + obj_ext =3D slab_obj_ext(slab, obj_exts, off); obj_cgroup_get(objcg); - slab_obj_exts(slab)[off].objcg =3D objcg; + obj_ext->objcg =3D objcg; } =20 return true; } =20 void __memcg_slab_free_hook(struct kmem_cache *s, struct slab *slab, - void **p, int objects, struct slabobj_ext *obj_exts) + void **p, int objects, unsigned long obj_exts) { size_t obj_size =3D obj_full_size(s); =20 for (int i =3D 0; i < objects; i++) { struct obj_cgroup *objcg; + struct slabobj_ext *obj_ext; unsigned int off; =20 off =3D obj_to_index(s, slab, p[i]); - objcg =3D obj_exts[off].objcg; + obj_ext =3D slab_obj_ext(slab, obj_exts, off); + objcg =3D obj_ext->objcg; if (!objcg) continue; =20 - obj_exts[off].objcg =3D NULL; + obj_ext->objcg =3D NULL; refill_obj_stock(objcg, obj_size, true, -obj_size, slab_pgdat(slab), cache_vmstat_idx(s)); obj_cgroup_put(objcg); diff --git a/mm/slab.h b/mm/slab.h index d63cc9b5e313..df2c987d950d 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -528,10 +528,12 @@ static inline bool slab_in_kunit_test(void) { return = false; } * associated with a slab. * @slab: a pointer to the slab struct * - * Returns a pointer to the object extension vector associated with the sl= ab, - * or NULL if no such vector has been associated yet. + * Returns the address of the object extension vector associated with the = slab, + * or zero if no such vector has been associated yet. + * Do not dereference the return value directly; use slab_obj_ext() to acc= ess + * its elements. */ -static inline struct slabobj_ext *slab_obj_exts(struct slab *slab) +static inline unsigned long slab_obj_exts(struct slab *slab) { unsigned long obj_exts =3D READ_ONCE(slab->obj_exts); =20 @@ -544,7 +546,30 @@ static inline struct slabobj_ext *slab_obj_exts(struct= slab *slab) obj_exts !=3D OBJEXTS_ALLOC_FAIL, slab_page(slab)); VM_BUG_ON_PAGE(obj_exts & MEMCG_DATA_KMEM, slab_page(slab)); #endif - return (struct slabobj_ext *)(obj_exts & ~OBJEXTS_FLAGS_MASK); + + return obj_exts & ~OBJEXTS_FLAGS_MASK; +} + +/* + * slab_obj_ext - get the pointer to the slab object extension metadata + * associated with an object in a slab. + * @slab: a pointer to the slab struct + * @obj_exts: a pointer to the object extension vector + * @index: an index of the object + * + * Returns a pointer to the object extension associated with the object. + */ +static inline struct slabobj_ext *slab_obj_ext(struct slab *slab, + unsigned long obj_exts, + unsigned int index) +{ + struct slabobj_ext *obj_ext; + + VM_WARN_ON_ONCE(!slab_obj_exts(slab)); + VM_WARN_ON_ONCE(obj_exts !=3D slab_obj_exts(slab)); + + obj_ext =3D (struct slabobj_ext *)obj_exts; + return &obj_ext[index]; } =20 int alloc_slab_obj_exts(struct slab *slab, struct kmem_cache *s, @@ -552,7 +577,13 @@ int alloc_slab_obj_exts(struct slab *slab, struct kmem= _cache *s, =20 #else /* CONFIG_SLAB_OBJ_EXT */ =20 -static inline struct slabobj_ext *slab_obj_exts(struct slab *slab) +static inline unsigned long slab_obj_exts(struct slab *slab) +{ + return false; +} + +static inline struct slabobj_ext *slab_obj_ext(struct slab *slab, + unsigned int index) { return NULL; } @@ -569,7 +600,7 @@ static inline enum node_stat_item cache_vmstat_idx(stru= ct kmem_cache *s) bool __memcg_slab_post_alloc_hook(struct kmem_cache *s, struct list_lru *l= ru, gfp_t flags, size_t size, void **p); void __memcg_slab_free_hook(struct kmem_cache *s, struct slab *slab, - void **p, int objects, struct slabobj_ext *obj_exts); + void **p, int objects, unsigned long obj_exts); #endif =20 void kvfree_rcu_cb(struct rcu_head *head); diff --git a/mm/slub.c b/mm/slub.c index 64705cb3734f..ae73403f8c29 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2031,7 +2031,7 @@ static bool freelist_corrupted(struct kmem_cache *s, = struct slab *slab, =20 static inline void mark_objexts_empty(struct slabobj_ext *obj_exts) { - struct slabobj_ext *slab_exts; + unsigned long slab_exts; struct slab *obj_exts_slab; =20 obj_exts_slab =3D virt_to_slab(obj_exts); @@ -2039,9 +2039,12 @@ static inline void mark_objexts_empty(struct slabobj= _ext *obj_exts) if (slab_exts) { unsigned int offs =3D obj_to_index(obj_exts_slab->slab_cache, obj_exts_slab, obj_exts); + struct slabobj_ext *ext =3D slab_obj_ext(obj_exts_slab, + slab_exts, offs); + /* codetag should be NULL */ - WARN_ON(slab_exts[offs].ref.ct); - set_codetag_empty(&slab_exts[offs].ref); + WARN_ON(ext->ref.ct); + set_codetag_empty(&ext->ref); } } =20 @@ -2159,7 +2162,7 @@ int alloc_slab_obj_exts(struct slab *slab, struct kme= m_cache *s, =20 static inline void free_slab_obj_exts(struct slab *slab) { - struct slabobj_ext *obj_exts; + unsigned long obj_exts; =20 obj_exts =3D slab_obj_exts(slab); if (!obj_exts) @@ -2172,11 +2175,11 @@ static inline void free_slab_obj_exts(struct slab *= slab) * NULL, therefore replace NULL with CODETAG_EMPTY to indicate that * the extension for obj_exts is expected to be NULL. */ - mark_objexts_empty(obj_exts); + mark_objexts_empty((struct slabobj_ext *)obj_exts); if (unlikely(READ_ONCE(slab->obj_exts) & OBJEXTS_NOSPIN_ALLOC)) - kfree_nolock(obj_exts); + kfree_nolock((void *)obj_exts); else - kfree(obj_exts); + kfree((void *)obj_exts); slab->obj_exts =3D 0; } =20 @@ -2201,9 +2204,10 @@ static inline void free_slab_obj_exts(struct slab *s= lab) #ifdef CONFIG_MEM_ALLOC_PROFILING =20 static inline struct slabobj_ext * -prepare_slab_obj_exts_hook(struct kmem_cache *s, gfp_t flags, void *p) +prepare_slab_obj_ext_hook(struct kmem_cache *s, gfp_t flags, void *p) { struct slab *slab; + unsigned long obj_exts; =20 if (!p) return NULL; @@ -2215,30 +2219,32 @@ prepare_slab_obj_exts_hook(struct kmem_cache *s, gf= p_t flags, void *p) return NULL; =20 slab =3D virt_to_slab(p); - if (!slab_obj_exts(slab) && + obj_exts =3D slab_obj_exts(slab); + if (!obj_exts && alloc_slab_obj_exts(slab, s, flags, false)) { pr_warn_once("%s, %s: Failed to create slab extension vector!\n", __func__, s->name); return NULL; } =20 - return slab_obj_exts(slab) + obj_to_index(s, slab, p); + obj_exts =3D slab_obj_exts(slab); + return slab_obj_ext(slab, obj_exts, obj_to_index(s, slab, p)); } =20 /* Should be called only if mem_alloc_profiling_enabled() */ static noinline void __alloc_tagging_slab_alloc_hook(struct kmem_cache *s, void *object, gfp_t = flags) { - struct slabobj_ext *obj_exts; + struct slabobj_ext *obj_ext; =20 - obj_exts =3D prepare_slab_obj_exts_hook(s, flags, object); + obj_ext =3D prepare_slab_obj_ext_hook(s, flags, object); /* * Currently obj_exts is used only for allocation profiling. * If other users appear then mem_alloc_profiling_enabled() * check should be added before alloc_tag_add(). */ - if (likely(obj_exts)) - alloc_tag_add(&obj_exts->ref, current->alloc_tag, s->size); + if (likely(obj_ext)) + alloc_tag_add(&obj_ext->ref, current->alloc_tag, s->size); } =20 static inline void @@ -2253,8 +2259,8 @@ static noinline void __alloc_tagging_slab_free_hook(struct kmem_cache *s, struct slab *slab, vo= id **p, int objects) { - struct slabobj_ext *obj_exts; int i; + unsigned long obj_exts; =20 /* slab->obj_exts might not be NULL if it was created for MEMCG accountin= g. */ if (s->flags & (SLAB_NO_OBJ_EXT | SLAB_NOLEAKTRACE)) @@ -2267,7 +2273,7 @@ __alloc_tagging_slab_free_hook(struct kmem_cache *s, = struct slab *slab, void **p for (i =3D 0; i < objects; i++) { unsigned int off =3D obj_to_index(s, slab, p[i]); =20 - alloc_tag_sub(&obj_exts[off].ref, s->size); + alloc_tag_sub(&slab_obj_ext(slab, obj_exts, off)->ref, s->size); } } =20 @@ -2326,7 +2332,7 @@ static __fastpath_inline void memcg_slab_free_hook(struct kmem_cache *s, struct slab *slab, void **= p, int objects) { - struct slabobj_ext *obj_exts; + unsigned long obj_exts; =20 if (!memcg_kmem_online()) return; @@ -2341,7 +2347,8 @@ void memcg_slab_free_hook(struct kmem_cache *s, struc= t slab *slab, void **p, static __fastpath_inline bool memcg_slab_post_charge(void *p, gfp_t flags) { - struct slabobj_ext *slab_exts; + unsigned long obj_exts; + struct slabobj_ext *obj_ext; struct kmem_cache *s; struct folio *folio; struct slab *slab; @@ -2381,10 +2388,11 @@ bool memcg_slab_post_charge(void *p, gfp_t flags) return true; =20 /* Ignore already charged objects. */ - slab_exts =3D slab_obj_exts(slab); - if (slab_exts) { + obj_exts =3D slab_obj_exts(slab); + if (obj_exts) { off =3D obj_to_index(s, slab, p); - if (unlikely(slab_exts[off].objcg)) + obj_ext =3D slab_obj_ext(slab, obj_exts, off); + if (unlikely(obj_ext->objcg)) return true; } =20 --=20 2.43.0