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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 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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> Content-Language: en-US, en-CA From: Luiz Capitulino In-Reply-To: <20250704131142.54d2bf06d554c9000e2d0c00@linux-foundation.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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.