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AJvYcCUbT9CXAZW/vQytVaGjba17BunSuJmIforu83opU+KyybvyCjH58rjQXBnkOeiaxXYUriuIZ1NCzqBLRCBO+ilz7iOzq3DjrRIRnkjf6A== X-Gm-Message-State: AOJu0Yz1HnIyovXSublPqUdUiSOuHVfn2CTqWg3cB0V98N6JHSoOt6ro bVdwx5z8TEuZejLe/gvTdcoBGuV9Rz5qinCEiYCdUVOAUoXheFkEfCo6gcojwsK0JLq6YAZjkFH UgQ== X-Google-Smtp-Source: AGHT+IGFiWXsCIvnXCn7DCHC4E3aqtfNjiBbLG3wTDrJrg+DapwG+olr3URRZ84R+eZCxmTFvxp+ectvo4c= X-Received: from surenb-desktop.mtv.corp.google.com ([2620:15c:211:201:953b:9a4e:1e10:3f07]) (user=surenb job=sendgmr) by 2002:a05:6902:134d:b0:dcb:e4a2:1ab1 with SMTP id g13-20020a056902134d00b00dcbe4a21ab1mr67096ybu.11.1708544527496; Wed, 21 Feb 2024 11:42:07 -0800 (PST) Date: Wed, 21 Feb 2024 11:40:45 -0800 In-Reply-To: <20240221194052.927623-1-surenb@google.com> Precedence: bulk X-Mailing-List: linux-modules@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240221194052.927623-1-surenb@google.com> X-Mailer: git-send-email 2.44.0.rc0.258.g7320e95886-goog Message-ID: <20240221194052.927623-33-surenb@google.com> Subject: [PATCH v4 32/36] codetag: debug: skip objext checking when it's for objext itself From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: kent.overstreet@linux.dev, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, roman.gushchin@linux.dev, mgorman@suse.de, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, penguin-kernel@i-love.sakura.ne.jp, corbet@lwn.net, void@manifault.com, peterz@infradead.org, juri.lelli@redhat.com, catalin.marinas@arm.com, will@kernel.org, arnd@arndb.de, tglx@linutronix.de, mingo@redhat.com, dave.hansen@linux.intel.com, x86@kernel.org, peterx@redhat.com, david@redhat.com, axboe@kernel.dk, mcgrof@kernel.org, masahiroy@kernel.org, nathan@kernel.org, dennis@kernel.org, tj@kernel.org, muchun.song@linux.dev, rppt@kernel.org, paulmck@kernel.org, pasha.tatashin@soleen.com, yosryahmed@google.com, yuzhao@google.com, dhowells@redhat.com, hughd@google.com, andreyknvl@gmail.com, keescook@chromium.org, ndesaulniers@google.com, vvvvvv@google.com, gregkh@linuxfoundation.org, ebiggers@google.com, ytcoode@gmail.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, bristot@redhat.com, vschneid@redhat.com, cl@linux.com, penberg@kernel.org, iamjoonsoo.kim@lge.com, 42.hyeyoo@gmail.com, glider@google.com, elver@google.com, dvyukov@google.com, shakeelb@google.com, songmuchun@bytedance.com, jbaron@akamai.com, rientjes@google.com, minchan@google.com, kaleshsingh@google.com, surenb@google.com, kernel-team@android.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, linux-arch@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, kasan-dev@googlegroups.com, cgroups@vger.kernel.org objext objects are created with __GFP_NO_OBJ_EXT flag and therefore have no corresponding objext themselves (otherwise we would get an infinite recursion). When freeing these objects their codetag will be empty and when CONFIG_MEM_ALLOC_PROFILING_DEBUG is enabled this will lead to false warnings. Introduce CODETAG_EMPTY special codetag value to mark allocations which intentionally lack codetag to avoid these warnings. Set objext codetags to CODETAG_EMPTY before freeing to indicate that the codetag is expected to be empty. Signed-off-by: Suren Baghdasaryan --- include/linux/alloc_tag.h | 26 ++++++++++++++++++++++++++ mm/slub.c | 33 +++++++++++++++++++++++++++++++++ 2 files changed, 59 insertions(+) diff --git a/include/linux/alloc_tag.h b/include/linux/alloc_tag.h index 85a24a027403..4a3fc865d878 100644 --- a/include/linux/alloc_tag.h +++ b/include/linux/alloc_tag.h @@ -28,6 +28,27 @@ struct alloc_tag { struct alloc_tag_counters __percpu *counters; } __aligned(8); +#ifdef CONFIG_MEM_ALLOC_PROFILING_DEBUG + +#define CODETAG_EMPTY ((void *)1) + +static inline bool is_codetag_empty(union codetag_ref *ref) +{ + return ref->ct == CODETAG_EMPTY; +} + +static inline void set_codetag_empty(union codetag_ref *ref) +{ + if (ref) + ref->ct = CODETAG_EMPTY; +} + +#else /* CONFIG_MEM_ALLOC_PROFILING_DEBUG */ + +static inline bool is_codetag_empty(union codetag_ref *ref) { return false; } + +#endif /* CONFIG_MEM_ALLOC_PROFILING_DEBUG */ + #ifdef CONFIG_MEM_ALLOC_PROFILING struct codetag_bytes { @@ -91,6 +112,11 @@ static inline void __alloc_tag_sub(union codetag_ref *ref, size_t bytes) if (!ref || !ref->ct) return; + if (is_codetag_empty(ref)) { + ref->ct = NULL; + return; + } + tag = ct_to_alloc_tag(ref->ct); this_cpu_sub(tag->counters->bytes, bytes); diff --git a/mm/slub.c b/mm/slub.c index 920b24b4140e..3e41d45f9fa4 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1883,6 +1883,30 @@ static inline enum node_stat_item cache_vmstat_idx(struct kmem_cache *s) #ifdef CONFIG_SLAB_OBJ_EXT +#ifdef CONFIG_MEM_ALLOC_PROFILING_DEBUG + +static inline void mark_objexts_empty(struct slabobj_ext *obj_exts) +{ + struct slabobj_ext *slab_exts; + struct slab *obj_exts_slab; + + obj_exts_slab = virt_to_slab(obj_exts); + slab_exts = slab_obj_exts(obj_exts_slab); + if (slab_exts) { + unsigned int offs = obj_to_index(obj_exts_slab->slab_cache, + obj_exts_slab, obj_exts); + /* codetag should be NULL */ + WARN_ON(slab_exts[offs].ref.ct); + set_codetag_empty(&slab_exts[offs].ref); + } +} + +#else /* CONFIG_MEM_ALLOC_PROFILING_DEBUG */ + +static inline void mark_objexts_empty(struct slabobj_ext *obj_exts) {} + +#endif /* CONFIG_MEM_ALLOC_PROFILING_DEBUG */ + /* * The allocated objcg pointers array is not accounted directly. * Moreover, it should not come from DMA buffer and is not readily @@ -1923,6 +1947,7 @@ int alloc_slab_obj_exts(struct slab *slab, struct kmem_cache *s, * assign slabobj_exts in parallel. In this case the existing * objcg vector should be reused. */ + mark_objexts_empty(vec); kfree(vec); return 0; } @@ -1939,6 +1964,14 @@ static inline void free_slab_obj_exts(struct slab *slab) if (!obj_exts) return; + /* + * obj_exts was created with __GFP_NO_OBJ_EXT flag, therefore its + * corresponding extension will be NULL. alloc_tag_sub() will throw a + * warning if slab has extensions but the extension of an object is + * 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); kfree(obj_exts); slab->obj_exts = 0; }