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Tue, 24 Oct 2023 06:47:01 -0700 (PDT) Date: Tue, 24 Oct 2023 06:46:06 -0700 In-Reply-To: <20231024134637.3120277-1-surenb@google.com> Mime-Version: 1.0 References: <20231024134637.3120277-1-surenb@google.com> X-Mailer: git-send-email 2.42.0.758.gaed0368e0e-goog Message-ID: <20231024134637.3120277-10-surenb@google.com> Subject: [PATCH v2 09/39] mm/slab: introduce SLAB_NO_OBJ_EXT to avoid obj_ext creation 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, corbet@lwn.net, void@manifault.com, peterz@infradead.org, juri.lelli@redhat.com, ldufour@linux.ibm.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 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Slab extension objects can't be allocated before slab infrastructure is initialized. Some caches, like kmem_cache and kmem_cache_node, are created before slab infrastructure is initialized. Objects from these caches can't have extension objects. Introduce SLAB_NO_OBJ_EXT slab flag to mark these caches and avoid creating extensions for objects allocated from these slabs. Signed-off-by: Suren Baghdasaryan --- include/linux/slab.h | 7 +++++++ mm/slab.c | 2 +- mm/slub.c | 5 +++-- 3 files changed, 11 insertions(+), 3 deletions(-) diff --git a/include/linux/slab.h b/include/linux/slab.h index 8228d1276a2f..11ef3d364b2b 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -164,6 +164,13 @@ #endif #define SLAB_TEMPORARY SLAB_RECLAIM_ACCOUNT /* Objects are short-lived */ =20 +#ifdef CONFIG_SLAB_OBJ_EXT +/* Slab created using create_boot_cache */ +#define SLAB_NO_OBJ_EXT ((slab_flags_t __force)0x20000000U) +#else +#define SLAB_NO_OBJ_EXT 0 +#endif + /* * ZERO_SIZE_PTR will be returned for zero sized kmalloc requests. * diff --git a/mm/slab.c b/mm/slab.c index 9ad3d0f2d1a5..cefcb7499b6c 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -1232,7 +1232,7 @@ void __init kmem_cache_init(void) create_boot_cache(kmem_cache, "kmem_cache", offsetof(struct kmem_cache, node) + nr_node_ids * sizeof(struct kmem_cache_node *), - SLAB_HWCACHE_ALIGN, 0, 0); + SLAB_HWCACHE_ALIGN | SLAB_NO_OBJ_EXT, 0, 0); list_add(&kmem_cache->list, &slab_caches); slab_state =3D PARTIAL; =20 diff --git a/mm/slub.c b/mm/slub.c index f7940048138c..d16643492320 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -5043,7 +5043,8 @@ void __init kmem_cache_init(void) node_set(node, slab_nodes); =20 create_boot_cache(kmem_cache_node, "kmem_cache_node", - sizeof(struct kmem_cache_node), SLAB_HWCACHE_ALIGN, 0, 0); + sizeof(struct kmem_cache_node), + SLAB_HWCACHE_ALIGN | SLAB_NO_OBJ_EXT, 0, 0); =20 hotplug_memory_notifier(slab_memory_callback, SLAB_CALLBACK_PRI); =20 @@ -5053,7 +5054,7 @@ void __init kmem_cache_init(void) create_boot_cache(kmem_cache, "kmem_cache", offsetof(struct kmem_cache, node) + nr_node_ids * sizeof(struct kmem_cache_node *), - SLAB_HWCACHE_ALIGN, 0, 0); + SLAB_HWCACHE_ALIGN | SLAB_NO_OBJ_EXT, 0, 0); =20 kmem_cache =3D bootstrap(&boot_kmem_cache); kmem_cache_node =3D bootstrap(&boot_kmem_cache_node); --=20 2.42.0.758.gaed0368e0e-goog