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Mon, 14 Oct 2024 15:25:53 +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 toqvCwE4DWddeQAAD6G6ig (envelope-from ); Mon, 14 Oct 2024 15:25:53 +0000 Message-ID: <99d33f0b-5991-4b23-908f-aabb9fdccb98@suse.cz> Date: Mon, 14 Oct 2024 17:25:52 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 bpf-next 1/3] bpf: Add kmem_cache iterator Content-Language: en-US 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 , "Paul E. McKenney" References: <20241010232505.1339892-1-namhyung@kernel.org> <20241010232505.1339892-2-namhyung@kernel.org> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJkBREIBQkRadznAAoJECJPp+fMgqZkNxIQ ALZRqwdUGzqL2aeSavbum/VF/+td+nZfuH0xeWiO2w8mG0+nPd5j9ujYeHcUP1edE7uQrjOC Gs9sm8+W1xYnbClMJTsXiAV88D2btFUdU1mCXURAL9wWZ8Jsmz5ZH2V6AUszvNezsS/VIT87 AmTtj31TLDGwdxaZTSYLwAOOOtyqafOEq+gJB30RxTRE3h3G1zpO7OM9K6ysLdAlwAGYWgJJ V4JqGsQ/lyEtxxFpUCjb5Pztp7cQxhlkil0oBYHkudiG8j1U3DG8iC6rnB4yJaLphKx57NuQ PIY0Bccg+r9gIQ4XeSK2PQhdXdy3UWBr913ZQ9AI2usid3s5vabo4iBvpJNFLgUmxFnr73SJ KsRh/2OBsg1XXF/wRQGBO9vRuJUAbnaIVcmGOUogdBVS9Sun/Sy4GNA++KtFZK95U7J417/J Hub2xV6Ehc7UGW6fIvIQmzJ3zaTEfuriU1P8ayfddrAgZb25JnOW7L1zdYL8rXiezOyYZ8Fm ZyXjzWdO0RpxcUEp6GsJr11Bc4F3aae9OZtwtLL/jxc7y6pUugB00PodgnQ6CMcfR/HjXlae h2VS3zl9+tQWHu6s1R58t5BuMS2FNA58wU/IazImc/ZQA+slDBfhRDGYlExjg19UXWe/gMcl De3P1kxYPgZdGE2eZpRLIbt+rYnqQKy8UxlszsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZAUSmwUJDK5EZgAKCRAiT6fnzIKmZOJGEACOKABgo9wJXsbWhGWYO7mD 8R8mUyJHqbvaz+yTLnvRwfe/VwafFfDMx5GYVYzMY9TWpA8psFTKTUIIQmx2scYsRBUwm5VI EurRWKqENcDRjyo+ol59j0FViYysjQQeobXBDDE31t5SBg++veI6tXfpco/UiKEsDswL1WAr tEAZaruo7254TyH+gydURl2wJuzo/aZ7Y7PpqaODbYv727Dvm5eX64HCyyAH0s6sOCyGF5/p eIhrOn24oBf67KtdAN3H9JoFNUVTYJc1VJU3R1JtVdgwEdr+NEciEfYl0O19VpLE/PZxP4wX PWnhf5WjdoNI1Xec+RcJ5p/pSel0jnvBX8L2cmniYnmI883NhtGZsEWj++wyKiS4NranDFlA HdDM3b4lUth1pTtABKQ1YuTvehj7EfoWD3bv9kuGZGPrAeFNiHPdOT7DaXKeHpW9homgtBxj 8aX/UkSvEGJKUEbFL9cVa5tzyialGkSiZJNkWgeHe+jEcfRT6pJZOJidSCdzvJpbdJmm+eED w9XOLH1IIWh7RURU7G1iOfEfmImFeC3cbbS73LQEFGe1urxvIH5K/7vX+FkNcr9ujwWuPE9b 1C2o4i/yZPLXIVy387EjA6GZMqvQUFuSTs/GeBcv0NjIQi8867H3uLjz+mQy63fAitsDwLmR EP+ylKVEKb0Q2A== In-Reply-To: <20241010232505.1339892-2-namhyung@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Action: no action X-Rspam-User: X-Stat-Signature: om4wi5rrhboff3x155kxffzh73cxjqro X-Rspamd-Queue-Id: 05C5440015 X-Rspamd-Server: rspam02 X-HE-Tag: 1728919551-326467 X-HE-Meta: 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 ZYeo5Ixp ebIGhE43jNz4bm32rdB2HI+1jtalzDd8nSi8b3/cjXgX8bbWn3hnrDJWr3NRhU7g5IsqmiXLaq0e5nTllLsUkDWuxh5hPnxuMcnMbmiJSDwjZZQHbkaCy9MyghSbIrbnRqW+F3EqNvpYlwezBZoD+969TltW0sU/KIHeBuduXZpwx98md8Q4snjEM5zTIjVFTpW7YL6Dk7E0Rj0CHnjuIFW8apgoWF0DBt+SQceWgsz8+Hyij2WytWcRIRWMZ1Y9Bjc5mXME395giukCJNBSZXboqJtAqbRS6aCzIoBnhC4yD08FoevXA0EjhCaGBDBcHCbYuvUGCQVebgj7EJK81gGOIZ3JSiovbrHu/IltTQLlpljDw5bMq3TCdegZ6O1IIXECEx7AZhe3Eydwm1Kf8IiffJVZXlCcY1hrtzZ7QW2FnLkhpYNlLyWSr3W8ketFULuzm/UDer9GTFQg= 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 10/11/24 01:25, 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. Yeah this paragraph can be dropped. > Signed-off-by: Namhyung Kim Acked-by: Vlastimil Babka #slab