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Thu, 3 Oct 2024 07:35:42 +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 ruGaNE5J/mZ/SQAAD6G6ig (envelope-from ); Thu, 03 Oct 2024 07:35:42 +0000 Message-ID: <29c666d1-1e68-4b90-a919-60efbc8ab7bf@suse.cz> Date: Thu, 3 Oct 2024 09:35:40 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 bpf-next 1/3] bpf: Add kmem_cache iterator To: Namhyung Kim , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , LKML , bpf@vger.kernel.org, Andrew Morton , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Roman Gushchin , Hyeonggon Yoo <42.hyeyoo@gmail.com>, linux-mm@kvack.org, Arnaldo Carvalho de Melo , Kees Cook References: <20241002180956.1781008-1-namhyung@kernel.org> <20241002180956.1781008-2-namhyung@kernel.org> Content-Language: en-US From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 2EE2C40007 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: b6hism6qqes3mi5mk3q6h581mm6h66nt X-HE-Tag: 1727940946-827837 X-HE-Meta: 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 eQ9R5lO+ zW0XDsVlV/R4dN3cl2ZmmNFX+FX6lIUur7/QednWaMhj+HiN2IooN2E1BO/jOOotKpIIiWoZ6CB1nZZEOk9hdiOU3vm+oM69BRhfo1sEGRCAWVzmf7P/RWWyns2oeQ56RYozZnScbJ0aFWxehjqaMahvoqfXFtDz1W1y8CZN58s5bQ7zXbfB31B+kh0O3UrPYmO5Cyf3tiguv9BgHIogYGgj2AP4G/q4ffRCZM+rgSS+TLtPbvAL078O8OHvb5NO6CCCEJ3Cvd3GrQnKf23j/8s11HpbiL/RZibrqUhYou8RUep6OS/AlOtSfim7i3MbRaAmLMWsWHCpm0CvsNcn5f/nSSA3DGnE6xKPRUTprqaRfDGc0SesJMn0niKOOtRbhyunlXp9Qc8DY6pCmjaa1WSyaJfXGpNgy9rTyJmZWSiFHtjsE3ALK1j0W96SpX1y6UkNvmXWYv+Qak+I= 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 10/2/24 20:09, Namhyung Kim wrote: > The new "kmem_cache" iterator will traverse the list of slab caches > and call attached BPF programs for each entry. It should check the > argument (ctx.s) if it's NULL before using it. > > Now the iteration grabs the slab_mutex only if it traverse the list and > releases the mutex when it runs the BPF program. The kmem_cache entry > is protected by a refcount during the execution. > > It includes the internal "mm/slab.h" header to access kmem_cache, > slab_caches and slab_mutex. Hope it's ok to mm folks. > > Signed-off-by: Namhyung Kim Acked-by: Vlastimil Babka #mm/slab