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Fri, 4 Jul 2025 20:11:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1751659904; bh=2PAoa0MKK1+xtzhOz4VJuro5NHJ+r4nGEvFdt7lZ9Lo=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=Z//DoQLTAZ6NEOaXcB2/HH5KQRCvobbpiSfq20qIjYykrW8XlQtXwW9GED6rwQDGB Y/gQK1O7j3B46o2u77/2KeQ7zrGYb7oHlSlw+Prli8t9rtQqacKxKAASIp9ptLOBfR vXaMR4gT8Wuz6cyYBVaGa2SVlpLeP46HbuS2qz58= Date: Fri, 4 Jul 2025 13:11:42 -0700 From: Andrew Morton To: Luiz Capitulino Cc: Vlastimil Babka , Baolin Wang , "Ritesh Harjani (IBM)" , Michal Hocko , david@redhat.com, shakeel.butt@linux.dev, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, rppt@kernel.org, surenb@google.com, donettom@linux.ibm.com, aboorvad@linux.ibm.com, sj@kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] mm: fix the inaccurate memory statistics issue for users Message-Id: <20250704131142.54d2bf06d554c9000e2d0c00@linux-foundation.org> In-Reply-To: <34be0c05-a805-4173-b8bd-8245b5eb0df8@redhat.com> References: <87bjqx4h82.fsf@gmail.com> <890b825e-b3b1-4d32-83ec-662495e35023@linux.alibaba.com> <87a56h48ow.fsf@gmail.com> <4c113d58-c858-4ef8-a7f1-bae05c293edf@suse.cz> <06d9981e-4a4a-4b99-9418-9dec0a3420e8@suse.cz> <20250609171758.afc946b81451e1ad5a8ce027@linux-foundation.org> <34be0c05-a805-4173-b8bd-8245b5eb0df8@redhat.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-HE-Meta: U2FsdGVkX1+VnArEtQIkysabBVyujT/R8gcDErFKWKErga+gnDQpW3m5Qub2K/j4FkV9/EDO1GDz0L+DNxfwQAXd8iJHiFErVPiAEkYAMrXZnCLyhMKOcwDzp6G7zX53gWdkELRfOiZ0SKimxqZeFSZw9bLSoojaaRVUUJnBI2tR5Lsf8oRjgHK/WWxmdXTbq6RR79C8xvp+k14MTw7cgJAd5Eoh66LY5LQsCPg3nQxucUM/nlY/82L+SeoKQwpjT1LqBakqHHKujn7jO2Urz8baND+lffGB+z01yFA2TI/sVdGKG6brYmSYlNwgPcjYTMHsvm7FDJt0+35dXb94wCI/GQhNrGZ/sgTwZgRCuu1HlPgnwgV/U4RjMXEJmovc3YQuK2X8tHv+FeHF4r0G/RxpZZBeUusf2JnhY4BWgLONr08loY5qGNfHk0g0yFO5mafa5ORSYRSgdAjtqDtdHfbXX20s18LVNt8KxDV2E8yG5GpNhvs0ww/cThehHnGw8emUibYIhZwg94gLHGl2QDC3nN7bzbETFuzJ+LZFoE2DVajUPsV7eShbRN2tRRDqeiuIfHN0AzqPx1HztY1Q7nccAtDLXr0QtZyL3Pb2AeGW9A57mU5+oP5MdchEsh4hrTPjhVEJIEwsL0bEBRlUiPC0qz95xptejAbQtev3/4gp29SXap+HdcLLa3/c1efJ/pF9l+RGzeztuuwTmWM/bo8vTr8bg4X7MjLNSSLyx51GiKwcU1Xy+pyqO6wN7GjjQzerJY/REDWoZ0x5ZG1N6TSw8KVnBASgnXJfTsWBWpRev/JuNHNjB+8+3Y7uzd3BbuQWQNtkLuQFnBG3ibeY2/G4BM4ec1NjzhEVS/5KdOxW93hLObcYtEAAj5DXB8yM0MU9wf+k7PhiLFd57XWOrGjzVGxl8QiVcPGTngRQQJdyx8iG88ir02PzhirLhu8rcdv3xL4XAefVhpTCGyo VI5fh0iR lv7bKlKwOEf2ZzHiceboWKvGkBBqVdF616vTSQe/OVMMG7H0Myk35yaJlYwRjxGXUnnq6YRG247BVmDQb6IYRGX9rpkRBMth+odw2kDrgFk1TXwpRF8iID4oKgjA3/GaNyYDhQRnJSFcQqD7aeoQt4AaNXgTPBJ4m2uWJO4g5h0xzPq2jK77bIEj0WXaj1vKFIX1hMdbAfasjPxKrXx/PI8ZjxvVTzaLxc/idChy7et0slD5NtEOJE0tagW/5r1Rr7CWbzqMLMuoBh4wpijhYhNwvE0n4Kv8zccTqnQ0HC/A2nYZpqtRmC63W8A== X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 244CF40006 X-Stat-Signature: p5geac9nwhbpykka5jfbccjnq7izge1w X-HE-Tag-Orig: 1751659906-732975 X-Rspam-User: X-HE-Tag: 1751659908-539085 X-HE-Meta: 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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: List-Subscribe: List-Unsubscribe: On Fri, 4 Jul 2025 14:22:11 -0400 Luiz Capitulino wrote: > > The patch is simple enough. I'll add fixes:f1a7941243c1 and cc:stable > > and, as the problem has been there for years, I'll leave the patch in > > mm-unstable so it will eventually get into LTS, in a well tested state. > > Andrew, are you considering submitting this patch for 6.16? I think > we should, it does look like a regression for larger systems built > with 64k base page size. I wasn't planning on 6.16-rcX because it's been there for years but sure, I moved it into the mm-hotfixes pile so it'll go Linuswards next week. > On comparing a very simple app which just allocates & touches some > memory against v6.1 (which doesn't have f1a7941243c1) and latest > Linus tree (4c06e63b9203) I can see that on latest Linus tree the > values for VmRSS, RssAnon and RssFile from /proc/self/status are > all zeroes while they do report values on v6.1 and a Linus tree > with this patch. Cool, I'll paste this para into the changelog to help people link this patch with wrong behavior which they are observing.