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Mon, 26 Feb 2024 16:52:14 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id IOYhGb7B3GVLFgAAD6G6ig (envelope-from ); Mon, 26 Feb 2024 16:52:14 +0000 Message-ID: <206b677f-0523-482f-b42b-2cdaf7ab8db9@suse.cz> Date: Mon, 26 Feb 2024 17:52:14 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 09/36] mm/slab: introduce SLAB_NO_OBJ_EXT to avoid obj_ext creation Content-Language: en-US To: Suren Baghdasaryan , akpm@linux-foundation.org Cc: kent.overstreet@linux.dev, mhocko@suse.com, 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, 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 References: <20240221194052.927623-1-surenb@google.com> <20240221194052.927623-10-surenb@google.com> From: Vlastimil Babka In-Reply-To: <20240221194052.927623-10-surenb@google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Spamd-Bar: / X-Rspam-User: X-Stat-Signature: jod51kjs147cywfjexpg8woaqgba3zqy X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: CFB2340004 X-HE-Tag: 1708966336-109758 X-HE-Meta: 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 gVRB0K1r /aeWjnQI5vVSYOdexIc3bX7VRDd+WRE4xUempk9f/ba34aJpwoQAeV8LHYADrhM0tm9RhmcOtfG+dn+uNZ3TDhDS1Vnu0YgfKbAk2VW1gsO0wA+bDnNkYJw34AnUJZfu68uhmCk7XpaP20LAThVKjBCqHQSOMvqjtQuYj4gpJYMIo2hflS2QCb5otOU3c8Yax7C3lqI0OKQeSCjxqcxSSYGOirMg5o+pWDl7v29Ko9FRol2NwMcmJomsFQWthBdn/coeA/XuJYor8Ejz23HcmmYg2awvvBLNAHMRWO1/y3Lk2ZfneNUgxK26vuNV0cABsbfIENKUJnMBtt44+JmTgHxSdiBOqgA9R6AlAw9a4YtQJzTvpZhcbGTUJ3uBnaxLm/sCASaTlJFuAV4dJ44eNtFpvqktIw4ZmNfBlxPm3/rf7zKObXyD/MuIbtDoe2XImiSohoQV/r03BV4FKCK766CTeruok9+MvoWyr0OYwLT9VK/U= 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 2/21/24 20:40, 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 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 > Reviewed-by: Kees Cook Reviewed-by: Vlastimil Babka