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[198.0.35.241]) by smtp.gmail.com with ESMTPSA id y11-20020a1709029b8b00b001b9e86e05b7sm3916537plp.0.2023.09.15.14.08.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Sep 2023 14:08:47 -0700 (PDT) Date: Fri, 15 Sep 2023 14:08:46 -0700 From: Kees Cook To: Matteo Rizzo Cc: cl@linux.com, penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com, akpm@linux-foundation.org, vbabka@suse.cz, roman.gushchin@linux.dev, 42.hyeyoo@gmail.com, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-hardening@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, corbet@lwn.net, luto@kernel.org, peterz@infradead.org, jannh@google.com, evn@google.com, poprdi@google.com, jordyzomer@google.com Subject: Re: [RFC PATCH 09/14] mm/slub: add the slab freelists to kmem_cache Message-ID: <202309151408.A419BEAD15@keescook> References: <20230915105933.495735-1-matteorizzo@google.com> <20230915105933.495735-10-matteorizzo@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230915105933.495735-10-matteorizzo@google.com> X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 97EF540020 X-Stat-Signature: i16bb78xhdno5rzi66ctcksnyn8x97pa X-HE-Tag: 1694812128-927297 X-HE-Meta: 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 hfRrcAl+ 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 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: On Fri, Sep 15, 2023 at 10:59:28AM +0000, Matteo Rizzo wrote: > From: Jann Horn > > With SLAB_VIRTUAL enabled, unused slabs which still have virtual memory > allocated to them but no physical memory are kept in a per-cache list so > that they can be reused later if the cache needs to grow again. > > Signed-off-by: Jann Horn Looks appropriately #ifdef'ed... Reviewed-by: Kees Cook -- Kees Cook