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Sun, 27 Oct 2024 19:40:15 +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 DSaCBx+XHmdgZQAAD6G6ig (envelope-from ); Sun, 27 Oct 2024 19:40:15 +0000 Message-ID: Date: Sun, 27 Oct 2024 20:40:14 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH mm-unstable v2] mm/page_alloc: keep track of free highatomic To: Yu Zhao , Andrew Morton , Link Lin Cc: David Rientjes , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Johannes Weiner , Zi Yan References: <20241026033625.2237102-1-yuzhao@google.com> <20241025212448.b1a9069d71df5b497e1b0190@linux-foundation.org> Content-Language: en-US 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: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Action: no action X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 9388BC000D X-Stat-Signature: yag7mmh9c5kr3so98pd3omkt8tapo8ej X-Rspam-User: X-HE-Tag: 1730057989-753835 X-HE-Meta: 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 5Svmq6NH makDaHmGfXV3jVq415WFgmvnmwGbCSNlKyR81VKKJYcyz+01Vw77gvfiTmmi6QzDb/1nDQSGjQWeewpl8g+k2BYzJmzIhrKVf64jxr3rTx/SQPZga6wU8uHH2bjqVXuwqOR+k5AkORQx43f5OX68tdvxiCKeRtcEjN0uuI8gA13T+HJkJRfxD6G74PxAen9JULHHjgQPrqPJMFxtJ03olCmtx7b8YcMTssZTbDXPtB0uxHYtR3pKrkqz0hixOKrLs7VLJSJEyuz0qgE2H12TDqEA6vixgbZBJSH6QdU07+wKrPGU7WUMskYv+KgTPjbm/r8cjDuxCueU08FnvOzM8pHTIqBtTOFFWXMjkYwkIQJNoOb1oMYyJ4VrrSBkyAd7/s4r2iQO0UnEEgeCQU/fUbTrrzIaAUgg+v2z7 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000005, 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 10/26/24 06:40, Yu Zhao wrote: > On Fri, Oct 25, 2024 at 10:24 PM Andrew Morton > wrote: >> >> Is a -stable backport needed? >> >> If so, is a Fixes: target identifiable? > > The code has been there for many years, and we only recently noticed > the problem from Link's repro. So it doesn't look like a stable > material. The stable backportability would be limited as there's a prerequisity on the "mm: page_alloc: freelist migratetype hygiene" patchset from half a year ago - patch applicability wise and importantly functionality wise. Otherwise the counter could drift easily. However we could perhaps mark it for a 6.12 stable backport as that's presumably the upcoming LTS.