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AJvYcCXL6KrSEkUyH82WhdLiif8DXcIWU3JmNvVwpVnfGquAglaT43uHteMZxSzM8gyWfyaqBfqlrOAMA6XYsRc9nitoUUE= X-Gm-Message-State: AOJu0YxqcepbqAiD2XSiAdWiHXSzAtrk8LMS0PB9kLMb1GrDuEHQVUxP DCNcnSqKruWaSOz1G0vyfnUgE86V8mlKMksWZHYWj3jH8EVs45unYdoE340P3Xux5rs/wFYeOlR eSAJ4PbwCuWpTnHW4IRtBGVp/w6j7+AKtINEyqw== X-Google-Smtp-Source: AGHT+IGvkzT3uz6qELPJtraK+YKtQ9uJucd+Pri79etJZSzYbQUZmm3eTGpEAZMzRr8Ip545g98kCtUJT9vyheZUmog= X-Received: by 2002:a67:f54a:0:b0:470:3ade:af52 with SMTP id z10-20020a67f54a000000b004703adeaf52mr11439980vsn.6.1708560634875; Wed, 21 Feb 2024 16:10:34 -0800 (PST) MIME-Version: 1.0 References: <20240221194052.927623-1-surenb@google.com> <20240221194052.927623-10-surenb@google.com> In-Reply-To: <20240221194052.927623-10-surenb@google.com> From: Pasha Tatashin Date: Wed, 21 Feb 2024 19:09:58 -0500 Message-ID: Subject: Re: [PATCH v4 09/36] mm/slab: introduce SLAB_NO_OBJ_EXT to avoid obj_ext creation To: Suren Baghdasaryan Cc: akpm@linux-foundation.org, 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, 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, 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-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: BC033160005 X-Stat-Signature: cdcfx5to8dazsdr439nqttgt7cpqf1e4 X-HE-Tag: 1708560635-399553 X-HE-Meta: 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 lv22hEQ4 hfoaI76DnQm2g3DEgKd8/vVl0oKPcmeg+ns0uW9diokZXocVkh97ZwcVU8s+oalAuV9RpZg5ejVuKrWSMivYk6AQHIbIAg6xGClb1iZ4HcZSWxEUHbonLIQ0nLPM2+peTgXjSPVRyrMKsY4QVvc/XlYhWduIdzUVQlT3TS4TLMhk0IdQ75gi8CnNa+GBjxvtWzIhDAwRJqvAUrXBp0dw1F5w/rjTADZCJQht1tFcXdXUbhx0GgrJ5KoIRQ6YHqkkQ5LoUW4JAyEWpTXqMCg+TI5Erjad14US1y2O/w4z7/8Glyix5FXBdAbFQjtsTQvq5lQFBfJS9duCf0TV8dJ+i2q3XmFb3oXt5U+EW9M4GgfSjG+qUw/xDm2+mxJFuCqT01hzS9L4bqYCl/N2wLMXMo0NPs/2HmjwtpmQ2WCxS1+0ZuRF/4cCajJgxIGfCrTiS4KxqVNKj75Gbd4VNX3VLdY79x1L13hQL5O0z X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Feb 21, 2024 at 2:41=E2=80=AFPM Suren Baghdasaryan wrote: > > Slab extension objects can't be allocated before slab infrastructure is > initialized. Some caches, like kmem_cache and kmem_cache_node, are create= d > 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 > Reviewed-by: Kees Cook Reviewed-by: Pasha Tatashin