From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 00D25C982EA for ; Wed, 23 Sep 2026 06:50:24 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B0B806B008C; Wed, 23 Sep 2026 02:50:23 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A96746B0092; Wed, 23 Sep 2026 02:50:23 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 960CE6B0093; Wed, 23 Sep 2026 02:50:23 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 772866B008C for ; Wed, 23 Sep 2026 02:50:23 -0400 (EDT) Received: from smtpin25.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay03.hostedemail.com (Postfix) with ESMTP id 03225A06DB for ; Wed, 23 Sep 2026 06:50:22 +0000 (UTC) X-FDA: 85244103126.25.961A286 Received: from out30-112.freemail.mail.aliyun.com (out30-112.freemail.mail.aliyun.com [115.124.30.112]) by imf18.hostedemail.com (Postfix) with ESMTP id D346F1C0007 for ; Wed, 23 Sep 2026 06:50:18 +0000 (UTC) Authentication-Results: imf18.hostedemail.com; dkim=pass header.d=linux.alibaba.com header.s=default header.b=Sk4LJfvt; spf=pass (imf18.hostedemail.com: domain of baolin.wang@linux.alibaba.com designates 115.124.30.112 as permitted sender) smtp.mailfrom=baolin.wang@linux.alibaba.com; dmarc=pass (policy=none) header.from=linux.alibaba.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1790146221; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=BueAFwiasv7ZjHBQeHqUfMN2LS9C/icsSJFoWptiCf8=; b=etrgZ0UcRhVjPmUgsQHzWeZAlbcizwavyX1aG9HVworebtHv+4oYOroPN3IeG3afA83tze OuZgYfkUhiF7r5UdENINOTqTat6atjFd30jiE6UTHQXFZo00LPuyQyZ5vmrsR+AiA/Fsm3 dhzKBSYeCS1lahAAP+3+wZFCg/w7CSI= ARC-Authentication-Results: i=1; imf18.hostedemail.com; dkim=pass header.d=linux.alibaba.com header.s=default header.b=Sk4LJfvt; spf=pass (imf18.hostedemail.com: domain of baolin.wang@linux.alibaba.com designates 115.124.30.112 as permitted sender) smtp.mailfrom=baolin.wang@linux.alibaba.com; dmarc=pass (policy=none) header.from=linux.alibaba.com ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1790146221; b=IZJ/szJZZHuJD2EgbC6rbydDHmRESwEmfA2vs5LtFwjlRcTWBfN6wXI9U6ASRLEw22Nh8g b65pC2DbVQMzQQWK0c93rlO2GgvqqXHOs64GsKYGbfNnUfhdgOQzxuAIKgr+8KT/mAsvww XbsN2TOKadNBcs2x6TB3KuLqF4FP4+0= DKIM-Signature:v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1790146216; h=Message-ID:Date:MIME-Version:Subject:To:From:Content-Type; bh=BueAFwiasv7ZjHBQeHqUfMN2LS9C/icsSJFoWptiCf8=; b=Sk4LJfvt/DMcrl5rqSzbhgHEXIg4grUm5s+MqMBZZjOVzCNUS2WPmbxko7O/4THPxGI1be/5U/iBClzCXbxrb7o8eqEYuRJ273UtTv8H8XrHTXvGQQ2265kSzAH0NVUfXpGWtMO8U8d9eGiKeRaH/UHlusBTyuK09MBImtw9U4s= X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R331e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033037026112;MF=baolin.wang@linux.alibaba.com;NM=1;PH=DS;RN=27;SR=0;TI=SMTPD_---0XBW5L8u_1790146212; Received: from 30.74.144.107(mailfrom:baolin.wang@linux.alibaba.com fp:SMTPD_---0XBW5L8u_1790146212 cluster:ay36) by smtp.aliyun-inc.com; Wed, 23 Sep 2026 14:50:13 +0800 Message-ID: <68bd860f-ec8c-4d8d-89a8-d7abcfd2f8dd@linux.alibaba.com> Date: Wed, 23 Sep 2026 14:50:12 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 11/19] selftests/mm: add order-parameterized khugepaged collapse cases To: Kiryl Shutsemau , Andrew Morton , "David Hildenbrand (Arm)" , "Lorenzo Stoakes (ARM)" , Mike Rapoport Cc: "Kiryl Shutsemau (Meta)" , linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Muhammad Usama Anjum , Usama Arif , "Nico Pache (Red Hat)" , Zi Yan , Barry Song , Dev Jain , Hugh Dickins , Lance Yang , "Liam R. Howlett" , Michal Hocko , Ryan Roberts , Shuah Khan , Suren Baghdasaryan , "Vlastimil Babka (SUSE)" , Alexander Gordeev , Jason Gunthorpe , Leon Romanovsky , kernel-team@meta.com References: <20260919002451.496763-1-kirill@shutemov.name> <20260919002451.496763-12-kirill@shutemov.name> From: Baolin Wang In-Reply-To: <20260919002451.496763-12-kirill@shutemov.name> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: D346F1C0007 X-Stat-Signature: tksaj8kycsk8b83o7ymzuc6rd7q3t9hx X-Rspam-User: X-HE-Tag: 1790146218-380495 X-HE-Meta: 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 138G+LMg rK6uNes2xONernxqYaAMmw77eaSGXERaWC40bTYBXRzTbJf/HnkmskWTxLAUlNfEL3UTlSkapPtiXrmgaULH83vy9lyPFcK3D1knC8IgnbGuh1ZUlyVsuS6CbMULW2SOkI0edDcrECDUz0l7oCTkHcly9cYt7I08jW3uBRQ2U3ByOFHzOgiULX+TOofrOJdUKtd2mEbkKsDAFXW6tI3uetA3mFrgvZIMnlf0XMCTy8bCCad5gsRF4p3Xv11bCZYf5kAGXlOg93lhL2F3xdBcjaWG6ds2GP0q2hYJqnxvLm05KOuY6Y1WAnFysqAsfCT5OBWzCtIK8t59g9D84cRaMXsCTI6JvsZyb/ndYtWnQfp+wN5NvTdFxGqz4+Cf13sO1wziI Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/19/26 8:24 AM, Kiryl Shutsemau wrote: > From: "Kiryl Shutsemau (Meta)" > > The mthp_khugepaged context runs the generic cases at a sub-PMD order, > which answers how many folios of that order a range ends up with. It > cannot say which order-sized window they landed in, so "the populated > window collapsed" and "the empty window next to it collapsed instead" look > alike. > > Add four cases that check each window on its own, with the folio-order > helpers in vm_util: > > - collapse_order_single_window(): only the populated window collapses; > - collapse_order_partial_window(): the default max_ptes_none lets a window > with one present PTE collapse; > - collapse_order_max_ptes_none(): with max_ptes_none=0 a full window > collapses and one missing a page does not; > - collapse_order_mixed_sources(): sources that are already large folios of > a smaller order collapse to the target. > > Each case faults its region before MADV_HUGEPAGE with only the target > order enabled, so the sources are order 0 and the result can only come > from khugepaged. They wait for a full pass rather than for the result to > appear: without a completed pass, "not collapsed" and "not scanned yet" > are the same thing. > > Assisted-by: LLM > Tested-by: Muhammad Usama Anjum > Signed-off-by: Kiryl Shutsemau (Meta) > --- Tested-by: Baolin Wang