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[69.156.206.24]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-702c4cc7593sm17760576d6.12.2025.07.04.13.14.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 04 Jul 2025 13:14:20 -0700 (PDT) Message-ID: <624c702b-d149-4025-9557-88736681246b@redhat.com> Date: Fri, 4 Jul 2025 16:14:19 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] mm: fix the inaccurate memory statistics issue for users To: Andrew Morton 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 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> <20250704131142.54d2bf06d554c9000e2d0c00@linux-foundation.org> From: Luiz Capitulino In-Reply-To: <20250704131142.54d2bf06d554c9000e2d0c00@linux-foundation.org> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: W3p_DlYwaoAJbTYWjXTIn5rfmwX38M9BVn021uZOONA_1751660061 X-Mimecast-Originator: redhat.com Content-Language: en-US, en-CA Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 8001AC0008 X-Stat-Signature: 46q7q943gg9wg1o49j58esbo5basjoos X-HE-Tag: 1751660065-557897 X-HE-Meta: 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 s+wQPCnx 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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 2025-07-04 16:11, Andrew Morton wrote: > 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. Wonderful, thank you! > >> 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. OK.