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Fri, 30 May 2025 20:06:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1748635584; bh=V8aTG04ZAEGYlZwTtP2eJJ/cuAcdbMFJH1v6uIkjQdQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KWVmkXkCWxK9+mwg0c9FMWRJgG0Fvf+KXSKGmCfTY8eO6amQuiKcdr/xN84yfFfsM 7zyyRLGrxu8m1VdvEvDJaglCGZedlpsLuF4xND2zKRD5HiA/QM9qUl7rh2ukQM/Dtw j1jx8kzb3D3tQezSYlWmxHYg52T6An6BfjM001UbagESiqrwZoCKs4Ocl6p5+7tY4p vGI8MBjS7obzrC608HunVqawuJnDWI/5PMQ7lGLkR1Y7TAjyz5+u9KFh88q1hNpuuJ x2QkAPA6M8/110qZjJQftSPYBuJChVL4YJ7R+whln+uxm75fWCN7NDQA6GHJSVctpy sK+cH4z0vJXLg== From: SeongJae Park To: Ye Liu Cc: SeongJae Park , akpm@linux-foundation.org, linux-debuggers@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-toolchains@vger.kernel.org, osandov@osandov.com, paulmck@kernel.org, sweettea-kernel@dorminy.me, liuye@kylinos.cn, fweimer@redhat.com, stephen.s.brennan@oracle.com Subject: Re: [PATCH v5] tools/mm: Add script to display page state for a given PID and VADDR Date: Fri, 30 May 2025 13:06:21 -0700 Message-Id: <20250530200621.52327-1-sj@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250530055855.687067-1-ye.liu@linux.dev> References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-HE-Meta: U2FsdGVkX1/O/paUEjvzrOtiDnwaxW1ftXgS8ER0bodL/mKsU5BZlQblJlKkDCCPLUNuZRlkMWQ2Vp5f/XjaiVPku5RN/uAnhqyMcmllNxSqh7MY5aa7HgLv9E3ZErqOEA9HMWZ52LKpH4Ilz/gM7Kf6oZMHMt3QenUPSWjaQiV4iGaOpT2jsoADwgl1LLNJT3VITNMob7kwq/A8RwfzZNeZ4b/fUhj01J1KzXIInyW4Rvir0LoWD1qsXahwl89ElBqmk8c91Sn5HEpQQ6XNutoX4gWe2sMP/f3oiOVDbZI0AFQYRUds1aeLvUmbjTuEslFtvrzO5A+1eabhoJQeOV1Kg3pgBGeYY46QnOH+oFiDXAJ3ulK8tRYCCGUdwuDDlkRdlazMqQOQlJ/RXPjmIgBHh4i97HIGsfHilwZzCrKVM5Mzs+uVtfIj4p14m1Q+ltOY2i+MyFrPfvWhsyVhnq30AMz1bxp3+J1oVXZOIH89zd1Vi4S0Odv9Dk5BuJMqrGEWzkS9YCX3dnTznOLqLAxl2i6lIk2PSigX/46DHWOFULaRnr/7wQJGfLqz/XZBCe5rM3c5V0vmlj9N0OYGPEQr/5cy++zZBVOxOapCPCMDsCs3EvI2Jq/LOXBihlijCx0/ibzwJcjJ5422LwqkuxGNCGmCwUIAil1X48xBAbrSXm+I7yoc3e2iF1hs1vBUjBq27TpjS3mANZenhVhE7VOjOgayJ86Z808juI82PTrSAQ1k1Ex6PhrhIvMttR7gUdPqmJnx5KnpAK8vC38DkB/ZtFrebl0sTHxlcFdhJuqvDJlMHtSk/OEiUNKsYTzNN5lLdeWkI3Y2fvzJZ8V4jBJxKVhk78vlQ5PYV4qT8v+g7NlSXMkpBqn9IJEu+kFpKo8vaTRdHv6o1gkY5J1G9vY0rTmcTNMKtFtfrJidL3HgITVSZ2ZCtWRMCZJxtDhoUOF5248z0GgmxcWlg3+ JuQHJ06L t8pwSEAnlr7rxLIsTRGgK+6WnUbzgYwAr7ALdd2c3VL47AygCL/2rtENKVsOM6UfJoaAmFz04x6cHz0mZ9j5XIVRvzOcxKm2Ipa1dSGPUinwKhE3ymN/LG3F7a7zURlVPmwbEM2FWIVDNi0KLURJrUOHOnttzUR4sQCQpHXqKZyVXhSUMtAzK34QpS3fcDU21fDAW9gVmhIA/c+Hcf55LPtvamVA/0/VZtn6OXxOZRnEwF6s= X-Rspam-User: X-Rspamd-Queue-Id: 2274220011 X-HE-Tag-Orig: 1748635585-407761 X-Rspamd-Server: rspam09 X-Stat-Signature: sknj6tqtq4pp5fc11od8bhrmef6jdom4 X-HE-Tag: 1748635587-918797 X-HE-Meta: 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 AggloCta VU3h/4kYOob9PhsaEPMdEDA3aJ5zLio3bMWWsG7jU2nPGkv4Mnbr3I6ESpvZKC3+W4k/V2sEs9WFru9Xumvq13MtYvU0JT2YSjnRJk9HU9ZlMnFTC22jLa6b26260iv5afUak5gh6CPVNKJwTyINLW3+8ZbY8/kkXs0qLJQ7YzZQhsKY= 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, 30 May 2025 13:58:55 +0800 Ye Liu wrote: > From: Ye Liu > > Introduces a new drgn script, `show_page_info.py`, which allows users > to analyze the state of a page given a process ID (PID) and a virtual > address (VADDR). This can help kernel developers or debuggers easily > inspect page-related information in a live kernel or vmcore. > > The script extracts information such as the page flags, mapping, and > other metadata relevant to diagnosing memory issues. > > Output example: > sudo ./show_page_info.py 1 0x7fc988181000 > PID: 1 Comm: systemd mm: 0xffff8d22c4089700 > RAW: 0017ffffc000416c fffff939062ff708 fffff939062ffe08 ffff8d23062a12a8 > RAW: 0000000000000000 ffff8d2323438f60 0000002500000007 ffff8d23203ff500 > Page Address: 0xfffff93905664e00 > Page Flags: PG_referenced|PG_uptodate|PG_lru|PG_head|PG_active| > PG_private|PG_reported|PG_has_hwpoisoned > Page Size: 4096 > Page PFN: 0x159938 > Page Physical: 0x159938000 > Page Virtual: 0xffff8d2319938000 > Page Refcount: 37 > Page Mapcount: 7 > Page Index: 0x0 > Page Memcg Data: 0xffff8d23203ff500 > Memcg Name: init.scope > Memcg Path: /sys/fs/cgroup/memory/init.scope As reported to the previous version, I show below on my test. Memcg Name: unknown Memcg Path: Unexpected error: 'struct kernfs_node' has no member 'parent' I know you explained it is an issue of drgn version on my setup, as a reply to my previous report. But, could you please make the output more easy to understand the problem? No strong opinion, though. > Page Mapping: 0xffff8d23062a12a8 > Page Anon/File: File > Page VMA: 0xffff8d22e06e0e40 > VMA Start: 0x7fc988181000 > VMA End: 0x7fc988185000 > This page is part of a compound page. > This page is the head page of a compound page. > Head Page: 0xfffff93905664e00 > Compound Order: 2 > Number of Pages: 4 > > Signed-off-by: Ye Liu Tested-by: SeongJae Park Thanks, SJ [...]