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AJvYcCXqzcwmSr4hrgNlpdMDr2FAXMSuGaJ1k1rFt6IQFiny6ihwb/w3WDUM+Ug7F6xvOYJihtUhOjtHdA==@kvack.org X-Gm-Message-State: AOJu0YwwQz2MyqBs3Ay5cbifM2ZuBmWt9vyQzi9eqNFkp+Ln+/9M3Xs1 9vkBZkTgUl4hGMy18R0Fe01P7QowVfYaOajQ7myBKTPQUKlERI2c7+0pdrCekeI+eeYVehhQWKt MKjsgdtNjRWuAKFFgM8lD4jKMsJmFjI2zrQDbMg== X-Google-Smtp-Source: AGHT+IEf5Ob7EXtqd8iWcFGFwDUCq53TzMogOqE3dzw3L/nuaDYAwShT+BhejHjdqP1p2ni0LVReVdAVYfYCT0xWwgo= X-Received: by 2002:a05:6358:2743:b0:1c3:94bf:643e with SMTP id e5c5f4694b2df-1c6cd14a63bmr595917955d.16.1731962626353; Mon, 18 Nov 2024 12:43:46 -0800 (PST) MIME-Version: 1.0 References: <20241116175922.3265872-1-pasha.tatashin@soleen.com> <20241116175922.3265872-5-pasha.tatashin@soleen.com> <87cyiukehs.fsf@trenco.lwn.net> In-Reply-To: <87cyiukehs.fsf@trenco.lwn.net> From: Pasha Tatashin Date: Mon, 18 Nov 2024 15:43:09 -0500 Message-ID: Subject: Re: [RFCv1 4/6] misc/page_detective: Introduce Page Detective To: Jonathan Corbet Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, cgroups@vger.kernel.org, linux-kselftest@vger.kernel.org, akpm@linux-foundation.org, derek.kiernan@amd.com, dragan.cvetic@amd.com, arnd@arndb.de, gregkh@linuxfoundation.org, viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz, tj@kernel.org, hannes@cmpxchg.org, mhocko@kernel.org, roman.gushchin@linux.dev, shakeel.butt@linux.dev, muchun.song@linux.dev, Liam.Howlett@oracle.com, lorenzo.stoakes@oracle.com, vbabka@suse.cz, jannh@google.com, shuah@kernel.org, vegard.nossum@oracle.com, vattunuru@marvell.com, schalla@marvell.com, david@redhat.com, willy@infradead.org, osalvador@suse.de, usama.anjum@collabora.com, andrii@kernel.org, ryan.roberts@arm.com, peterx@redhat.com, oleg@redhat.com, tandersen@netflix.com, rientjes@google.com, gthelen@google.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: C0294140017 X-Stat-Signature: cwqc1i7p3ghw4jqd8wff5uw6rgg5qtjb X-Rspam-User: X-HE-Tag: 1731962594-986670 X-HE-Meta: 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 X0xOp1nk nxBUAXAVNl90J3KccIin0qJEUrgtr9k7wPDK2pAs3dMNrPZeOb+LVKFWK87bEXGuVtB0znOJC65zMUvF5pC6Gu007aFjEVf04VlnxuAaihJdTFiTHYqAIkGkMOFgX7/+IReiCi4sI3CZ0Pxe8EHomxAV/rQ3m4SdZtcaoblKXknp4ZdDYtXo42I0Z9iUJjpXgAIJH/abGysShc5TL07i86xgdmdIeEl004pz8vVQBt5hf2Hu9mwa7c/nuCrA7uxMJSXb6i/HdEYSlSOwRLwPvscKeCYgekzmdVVsHCkSW1YKn7RlexzZGuSivTkCg40hmrn7K8U2ujSpHaR3vF2lZP16yNozwUyyJk0yEdXeYsjTVx3DptYHXL8GyOcBAXt0Ehxc1pEJnU7WPRmHoH+V0mKUxzM0SsEqhNkK+VNwqZemMe+k= 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 Sat, Nov 16, 2024 at 5:20=E2=80=AFPM Jonathan Corbet wr= ote: > > Pasha Tatashin writes: > > > Page Detective is a kernel debugging tool that provides detailed > > information about the usage and mapping of physical memory pages. > > > > It operates through the Linux debugfs interface, providing access > > to both virtual and physical address inquiries. The output, presented > > via kernel log messages (accessible with dmesg), will help > > administrators and developers understand how specific pages are > > utilized by the system. > > > > This tool can be used to investigate various memory-related issues, > > such as checksum failures during live migration, filesystem journal > > failures, general segfaults, or other corruptions. > > > > Signed-off-by: Pasha Tatashin > > --- > > Documentation/misc-devices/index.rst | 1 + > > Documentation/misc-devices/page_detective.rst | 78 ++ > > This seems like a strange place to bury this document - who will look > for it here? Even if it is truly implemented as a misc device (I didn't > look), the documentation would belong either in the admin guide or with > the MM docs, it seems to me...? I will put it under MM docs in the next version, as I will also convert Page Detective to be part of core mm. Thank you, Pasha