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Mon, 22 Jul 2024 06:49:20 +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 sfMtKfAAnmaCPQAAD6G6ig (envelope-from ); Mon, 22 Jul 2024 06:49:20 +0000 Message-ID: <7a7a05cf-17f6-43c2-acf2-b17f76e1d81d@suse.cz> Date: Mon, 22 Jul 2024 08:49:20 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC 0/6] mm, slub: handle pending kfree_rcu() in kmem_cache_destroy() Content-Language: en-US To: David Rientjes Cc: "Paul E. McKenney" , Joel Fernandes , Josh Triplett , Boqun Feng , Christoph Lameter , Steven Rostedt , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Julia Lawall , Jakub Kicinski , "Jason A. Donenfeld" , "Uladzislau Rezki (Sony)" , Andrew Morton , Roman Gushchin , Hyeonggon Yoo <42.hyeyoo@gmail.com>, linux-mm@kvack.org, linux-kernel@vger.kernel.org, rcu@vger.kernel.org References: <20240715-b4-slab-kfree_rcu-destroy-v1-0-46b2984c2205@suse.cz> <607f42cd-868b-28d0-8e94-819323557c09@google.com> 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: <607f42cd-868b-28d0-8e94-819323557c09@google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: AB12A20007 X-Stat-Signature: tqdsph3gkazspbsandecsig36hqrqekg X-Rspam-User: X-HE-Tag: 1721630962-188797 X-HE-Meta: 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 B25DEZrI L4GCJz8tOPJHqMOkukq1rlmX9G1ZjD1uM+loNDIufoHc+E8y6X1xjfyG5jMWbLNt3b+R2PUGSkHtuA7BEouaO+5hoksVVIKGz0HmZQFA94mhqc+4eHGqikVAL/kjfcMVVNY1Ug37ibK53hU/hXcrTXLJehwOB2iK0+mnxrfNg3CDmvZNjs8CjBnj/+VK0S3yCbgYpVPWiRb377gYfgt8aBQLYJzvG5IShNOK3D/Mpg6p05btBq4lunG2ZS3bywyiuIBcKjJSnYMmX+FF66rZzYb6FL1M6F8nzvhywUv4CnZp6L2isTFBIOYWGcVrRacclJhy+Z99gJShJkBlxJus6Lwn1HOQyvHZMeBDeiV5b+QJdLeZ1rVwXg6q1zlCB3sdUNy7o983mBSLsA7xwStylbsSZxBUQowOkkvmzPPyEb+/GDBkiAkf3ZZHaNQ== 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 7/21/24 4:39 AM, David Rientjes wrote: > On Mon, 15 Jul 2024, Vlastimil Babka wrote: > >> First RFC, feel free to ignore for now if too busy with merge window. >> Also in git: >> https://git.kernel.org/vbabka/l/slab-kfree_rcu-destroy-v1r0 >> >> Based on slab/for-next: >> https://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab.git/log/?h=slab/for-next >> > > Thanks Vlastimil, do you see value in testing of this series right now or > should we wait for another series to be posted? > > I'm happy to run this through testing on a few different architectures, > but not sure if you have an update baking in the oven that would supersede > it. Thanks, but such testing would quickly fail until the following is resolved in patch 5/6 with the help of RCU experts :) + // XXX use the real kmem_cache_free_barrier() or similar thing here + rcu_barrier();