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AJvYcCXrvyrAyJcwdiCAkgLR7Vrbb7mfTtqS6QaTzxF0GnGQXG+kuldbnp4BuppbHHQg9l1BW732JqMQivpaVH9lKxAwVNcWPy0GpGtCzwFo X-Gm-Message-State: AOJu0Yxog9RheM4ZPIvDf7TYVKuVW7ej4axmTY000jx27aDyK9MdP1h1 ISradTrEW9Nci7iNvvwXo1kmp+eQRpPtV2UOAykIbZ8ub3BH1rEiOCfkqPdbnZ6hIiuM7HqIjyO D/g== X-Google-Smtp-Source: AGHT+IGROXQhVTEL+/Ecek6yIPftetu6NwNXc2sw4rx8G7tLlUrCGcwRYmXksEw30SynbjVDOeX+ECRwtfM= X-Received: from surenb-desktop.mtv.corp.google.com ([2620:15c:211:201:a489:6433:be5d:e639]) (user=surenb job=sendgmr) by 2002:a05:6902:2408:b0:dc2:1f34:fac4 with SMTP id dr8-20020a056902240800b00dc21f34fac4mr5790745ybb.2.1711039101565; Thu, 21 Mar 2024 09:38:21 -0700 (PDT) Date: Thu, 21 Mar 2024 09:36:55 -0700 In-Reply-To: <20240321163705.3067592-1-surenb@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240321163705.3067592-1-surenb@google.com> X-Mailer: git-send-email 2.44.0.291.gc1ea87d7ee-goog Message-ID: <20240321163705.3067592-34-surenb@google.com> Subject: [PATCH v6 33/37] 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, jhubbard@nvidia.com, 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, songmuchun@bytedance.com, jbaron@akamai.com, aliceryhl@google.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 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 aefe3c81a1e3..c30e6c944353 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); =20 +#ifdef CONFIG_MEM_ALLOC_PROFILING_DEBUG + +#define CODETAG_EMPTY ((void *)1) + +static inline bool is_codetag_empty(union codetag_ref *ref) +{ + return ref->ct =3D=3D CODETAG_EMPTY; +} + +static inline void set_codetag_empty(union codetag_ref *ref) +{ + if (ref) + ref->ct =3D 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 =20 struct codetag_bytes { @@ -140,6 +161,11 @@ static inline void alloc_tag_sub(union codetag_ref *re= f, size_t bytes) if (!ref || !ref->ct) return; =20 + if (is_codetag_empty(ref)) { + ref->ct =3D NULL; + return; + } + tag =3D ct_to_alloc_tag(ref->ct); =20 this_cpu_sub(tag->counters->bytes, bytes); diff --git a/mm/slub.c b/mm/slub.c index a05d4daf1efd..de8171603269 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1873,6 +1873,30 @@ static inline enum node_stat_item cache_vmstat_idx(s= truct kmem_cache *s) =20 #ifdef CONFIG_SLAB_OBJ_EXT =20 +#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 =3D virt_to_slab(obj_exts); + slab_exts =3D slab_obj_exts(obj_exts_slab); + if (slab_exts) { + unsigned int offs =3D 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 @@ -1913,6 +1937,7 @@ static int alloc_slab_obj_exts(struct slab *slab, str= uct 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; } @@ -1929,6 +1954,14 @@ static inline void free_slab_obj_exts(struct slab *s= lab) if (!obj_exts) return; =20 + /* + * 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 =3D 0; } --=20 2.44.0.291.gc1ea87d7ee-goog