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b=SYllJxfHs7eZz1MaPajeoLdMwj4h4cxN9rarb4qzX4V47OI91nckYN2vt4+757pfi uyoBfj2Q9wEi9yKDiofgFX7HmYaasX+jWq4J2vhY049K1ljxXtl24CSq55sgbqmGLy Pm5vVTzkRdrtYkl7tpLQ8ZqoJ/Xrc7JI3nMZgpEp1VWopVmcvMs3xMnHMGAHIJqgLC UAE2dWtGOkYvJkZOE4/cnfH6JP/Y3VUJX7rND40cpJEJ3BtchnnImxGOTsh+CBKzJh wL6aQJfK4KqsHbxkJ5OEQe881dsolghXB7MtPneyHBu44zzHvQkMH3J71EeJUaHya3 sdbqr7c2FKi4w== Message-ID: <670931b2-7d9d-4e37-a410-a2e7d85cfdd4@kernel.org> Date: Tue, 7 Jul 2026 17:27:09 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v12 1/4] mm/page_owner: add print_mode filter Content-Language: en-US To: Zhen Ni , akpm@linux-foundation.org Cc: surenb@google.com, mhocko@suse.com, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20260707115411.1714314-1-zhen.ni@easystack.cn> <20260707115411.1714314-2-zhen.ni@easystack.cn> From: "Vlastimil Babka (SUSE)" Autocrypt: addr=vbabka@kernel.org; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSNWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBrZXJuZWwub3JnPsLBsAQTAQoAWhYhBKlA1DSZLC6OmRA9UCJPp+fM gqZkBQJqFFy6GxSAAAAAAAQADm1hbnUyLDIuNSsxLjEyLDIsMgIbAwUJGtCBUAULCQgHAwUV CgkICwUWAgMBAAIeBQIXgAAKCRAiT6fnzIKmZJIUEADFx/tREzUImHrEwVHeSvDFmA7tJysI UVrlvrM09E7GIuzphzv7jYmo8n3ANpCczLEVr4G0syYQdTigaZgv3+FQDIIzhKih1IHhu1Ei XHlywNWKnQxxQEUNi5Mwx43wQz5XVw9F1A7gtKBKNtfogO511hAbrzagrYajyQacEJ/+sfhZ 9Da8ltHIXD8pcYaHUfQgEusCgmEd9+KrUwrTbckFKmYq5chuE6yJ4J0EmWknL096jIE6CnzF FRslQ3B1UKDjxVsm1ZHfir5NeWszLkTvGFsddFaWTgh8UycESG6VQzKXjjewXu2pG7YQYRpj QKm1W5X2TkwWkXRBZTmfmbhxIUMh3+zf5wQ463rSmDN/8v81tdqBtAW6rH/kzg1GvkaTHXn0 507yEHFzBksk2viAuIxxr7km8+/KARYLIdGtx30EG8cKzAUZOK6WqxtNCsXUJNrVE8CWrCaD icoNu7Fs1c5hmPHdSTnU48ce67449DdnO4neLSNhRiGlMHJgfJUmgrxu/hcYeOZ3haWmEQ2w uW1Mh01OHi8QZHCEyAbABrPs9GUgccc/4eYXX9hIgxfSkYzn8f+8NuIFPWl/0uTvjgqU29FQ SbzOLxHq9439Ox40G5mS5eZXRGxITYR+6TXvRGI6P/264jvflnr/pDGUttaikU+0W+1uxgKH cmYbEc7ATQRbGTU1AQgAn0H6UrFiWcovkh6EXVcl+SeqyO6JHOPm+e9Wu0Vw+VIUvXZVUVVQ La1PQDUi6j00ChlcR66g9/V0sPIcSutacPKfdKYOBvzd4rlhL8rfrdEsQw5ApZxrA8kYZVMh FmBRKAa6wos25moTlMKpCWzTH84+WO5+ziCTsTUZASAToz3RdunTD+vQcHj0GqNTPAHK63sf bAB2I0BslZkXkY1RLb/YhuA6E7JyEd2pilZOrIuBGl/5q2qSakgnAVFWFBR/DO27JuAksYnq +aH8vI0xGvwn75KqSk4UzAkDzWSmO4ZHuahKtQgZNsMYV+PGayRBX9b9zbldzopoLBdqHc4n jQARAQABwsF8BBgBCgAmAhsMFiEEqUDUNJksLo6ZED1QIk+n58yCpmQFAmfIHFQFCRYU6J8A CgkQIk+n58yCpmS2PA//bqN1LfcotmArgElsa+0EGZSQlYgK48pm8WAeTXTngudP9IJ4SuKY HR5RNjHcBeqN+Me0zxRqYzRb8nGanHEkDyf4Im8DQM8d6vbyU+FcPmG4skud4kgS1zMHnlVd SXfSIwKC/hKgdHG8aBV7545Lz9X6Iohea+94wneD0aw/hqF+QWewGZhWJriWAZtvEkzNjQOi 4U9F/trLten/x7bpphDSnDMKJtITbtzATT1Dq7o7VpIUK1nCTQALMuMjKCdi8OdU/+V+R3O4 0PXWvX8qrvqYapVbZ+9KqT74FsuB0Ya9uXwgBF2Q6cRuETZk5vqaqKxzqoQZCO8AOz/58j6O 2RHNy/mZEN+7tJ5Tsq42zVJ4jxsT8b9YplavCMsnBgDeRWhcbYhCyttoL7nYISyWg4kQYZ/P wIV3OuNv2f8iKYsxNsRuClOAF82+gvqOy1/1pprFjy8uo2pkoOrb63aOP3vO5VHnRKgra6dq NcaZ+c6J4H+nEJGi2SkHAUJz5oBzuThvPudLvPA/SK8sKoM01IRxSihev/S/5WLazXB1PGem OCbvzC1IjWJJraxiDJ5IygokapUa2RP7+WBR22skQ3SSl6G107QgWKSyTOGWEaRmV53vxQLV jXuCmzSSasTL60zq5yGrT4/DYQVSNEUiUbG4pYekxJujNeEDkUlky0Y= In-Reply-To: <20260707115411.1714314-2-zhen.ni@easystack.cn> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Stat-Signature: bbn9tjaw1g356mteobhskuc33u8t3zas X-Rspamd-Queue-Id: B83B740012 X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1783438034-382722 X-HE-Meta: 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 IxbO8KrJ 99UFAkq5fOUn5m4KcwUjzchGO5iQe5uJFG3w75QuIqFcjCtWI3mABF4LWM7FUa2E5B8S+nLZcczL5c749dZfIefY1DyUrqfaqixy36nF+FUXqCo3Hx5SGnBKnGPzooLeqCPnltToW87wLh4bivWxvyU+Y69GHgxsaquBCpXQLB5Q+CmBr4UIWTrEbWACk9XXg+q5s/GrIyUbKr2HmK8pln/sIPALEndhkKDB6pCizbPmNMByWpjGH86plEQ5jzCtmuEb6u3gcRb9gAp8Hj80Q3Z7xZ6eOKHUQ800p5IZgXNDR3UUTPnDTo0UfsDt/FvycCWl7pkTYVQWPgOhpGltvlyUrVGNkpVpeH/28 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/7/26 13:54, Zhen Ni wrote: > Add a print_mode filter to page_owner that allows users to choose between > printing stack traces, stack handles, or both, providing flexibility for > different debugging and analysis scenarios. > > The filter provides three modes via page_owner: > - Writing "mode=stack" prints stack traces for each page (default) > - Writing "mode=handle" prints only the handle number > - Writing "mode=stack_handle" prints both stack traces and handles > > The default stack mode maintains backward compatibility with existing > usage, displaying complete stack traces for each page allocation. > > The handle mode dramatically reduces log size and improves performance by > showing only the handle number instead of the full stack trace. Testing > shows handle mode reduces output size by ~66% (84MB vs 244MB) and > improves read performance by ~4.4x compared to full stack output. The > mapping from handles to actual stack traces can be obtained via the > show_stacks_handles interface. > > The stack_handle mode prints both stack traces and handles, making it > easier to identify pages with the same allocation pattern by comparing > handle numbers instead of comparing large stack traces. > > Example usage: > # Using the page_owner_filter tool (recommended) > ./page_owner_filter -m stack # Print only stack traces (default) > ./page_owner_filter -m handle # Print only handles > ./page_owner_filter -m stack_handle # Print both stack and handles > > Sample output (handle mode): > Page allocated via order 0, migratetype Unmovable, gfp_mask 0x1100ca, > pid 1, tgid 1 (systemd), ts 123456789 ns > PFN 0x1000 type Unmovable Block 1 type Unmovable > Flags 0x3fffe800000084(referenced|lru|active|private|node=0|zone=1) > handle: 17432583 > ... > > This implementation uses per-file-descriptor filter state stored in > file->private_data, allowing each opener to have independent filter > configuration. > > Signed-off-by: Zhen Ni > Tested-by: Zi Yan I think in general Tested-by" can't carry from previous version due to (functional) changes. Andrew can remove it locally, or Zi can re-test :) > Acked-by: Zi Yan Reviewed-by: Vlastimil Babka (SUSE)