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b=ObfaIH+txn/i4w0eUr3hbUPklaxbCmSwjEVRn+6Aq5Bxyd/+REQ3ZA15m3bEeIdKa XrXESA/rhCbSKSDChWkZ3NqpJ9lotRfe+kHClC3klKTTUrXJZv3GoK+P4OZEVpRB76 DU0gAKxwezMq6Oo2XeSq8iaradXWQ0tngo+lfLUs= Date: Wed, 8 Oct 2025 19:32:23 -0700 From: Andrew Morton To: Mauricio Faria de Oliveira Cc: Michal Hocko , Vlastimil Babka , Oscar Salvador , Suren Baghdasaryan , Brendan Jackman , Johannes Weiner , Zi Yan , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-dev@igalia.com Subject: Re: [PATCH v2 0/5] mm/page_owner: add debugfs files 'show_handles' and 'show_stacks_handles' Message-Id: <20251008193223.f0e7c243bef94b7db22070fb@linux-foundation.org> In-Reply-To: <20251001175611.575861-1-mfo@igalia.com> References: <20251001175611.575861-1-mfo@igalia.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: AE79014000F X-Stat-Signature: 6epebnwkeoze3quchngrbqk3meips4tq X-Rspam-User: X-HE-Tag: 1759977145-991213 X-HE-Meta: U2FsdGVkX1/aDH5PhNwqe2v2Bn2rQbOtxHn3hWayylsJ2gofTpLH409nOfgKBB6WQxulKTvoDC+Hmvkv7A/xeB+QHZiGxkP8hQJZUlJWIS1M+8l5IxbWJfy6y9Q8x5ia3oW82q0eraMISnJNca/qkTeGuzU/yML0Mgf2JDbnSI0j/DrloYySzc0ngEBihhCzt0tl68mKNFaIVKQgwFZ2Awso756HS6Wsd83hEndQuqZ/1iksjpeeFT4jEx/eVGZdf3DZ2Hz3bwteFTTlMty57QZspN47eD+oqhSjVIMvz1tSN3CEypYVIQq7zOevnTiiOTl/HtIscR3nzhIQGnOzILxi5CXG39TTW7WPDfTU+bFgpwWdwy/85gT86LWDB8vUV9D1i4uE3q94oAa7cbPZTMhfXgQywthzPoVhhAHU/ANDs35t68QcJIKK5U3vwBg1QriLjeCVPZ4VrbO5oNoji6UIZOdCio77KnvaWvAMMZcVWvJbXuthTdF10QM1DQISQDexGCNegmckU278YWSejkpyXjuV1ARoDcR7xdlwqCWZO5lrATZz/gi9+TOW09O0Zyriu0Iog+pcfQmXp1BEJkiSbFA53VZGu6ftr3bGqyK29wlJg3ONhMi/fg1z9uqjMjhapHRos8sWtBm06v0/R9yZD6MTtoa9PCTBCQL0+KzwoUo43/IKM4SpEGFeiQfOFBpasDglBl/YAb+/ZZAQBJjPuT4Eyisj0KnhfuDy2+yMpaygTL1i36fK//hR+so37txBlO5DQTsc0GRxxvVVxW0fE2ddjVrbzHBeHvGZXSJ9hGczxFovEDDu6p3eQiD+5bj2s8U7UjBu4ZGN+gV0me0UyvbhyyhQEvFo96ETel5BAy6MzRd9IMAHZXIfnV2R8nCQXiva5frHToIKTGWsOsjOBuAzXJn2AjIgDOUWi5pWDr1ky4FSlqL/ahY8D6jFnK6WYu/r1JoA5CatcjT cfe1hIdo XUT92omCRixhKwtALVhv3bkQiehIGLRRZS+urJi1kB7dJedUF2rou7Ryp52G+W3Tc4KV7wVv8Hu5kkCxPhtnHUw4Q9G+itdCM6F5+k9eXhmL3mr1b/Y9Py+dB5v45B2KumUyibEdxRXQHmqWn0ehKrfiKYaphKCish8pYHMoHLoczid6+slgyX/PrqnDc69M3KLb7S9SpLOe0OT+bQSViazhk4UTGpGYC6UPRl6u2l00gyR6DN8jqzXXcPvidLkub5OfVbOkVtiHVL2WxVmp8uHecKw1s9ldsK95yZOXT89yyO/DkiNWMiflUroZV9Q+ZpQCLeNUyvOOXIAESOfcIZ6j/5ivRCz63IAL+ 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 Wed, 1 Oct 2025 14:56:06 -0300 Mauricio Faria de Oliveira wrote: > Fortunately, the kernel can provide a unique identifier for stack traces > in page_owner, which is the handle number in stackdepot. This eliminates > the need for creating keys (hashing) in userspace during post-processing. Looks nice, thanks. I'm surprised that our in-tree userspace tooling for page_owner seems rather weak. Nobody has touched tools/mm/page_owner_sort.c in two years.