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 57354CA5FED for ; Wed, 7 Oct 2026 02:14:32 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 06CA06B0099; Tue, 6 Oct 2026 22:14:20 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id EE7F66B0096; Tue, 6 Oct 2026 22:14:19 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id DAF336B0098; Tue, 6 Oct 2026 22:14:19 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id B0F6B6B0093 for ; Tue, 6 Oct 2026 22:14:19 -0400 (EDT) Received: from smtpin24.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 9982B1203D4 for ; Wed, 7 Oct 2026 02:14:18 +0000 (UTC) X-FDA: 85294210596.24.F4C63F4 Received: from shelob.surriel.com (shelob.surriel.com [96.67.55.147]) by imf08.hostedemail.com (Postfix) with ESMTP id 197D2160007 for ; Wed, 7 Oct 2026 02:14:16 +0000 (UTC) Authentication-Results: imf08.hostedemail.com; dkim=pass header.d=surriel.com header.s=mail header.b="kTfrxL U"; spf=pass (imf08.hostedemail.com: domain of riel@surriel.com designates 96.67.55.147 as permitted sender) smtp.mailfrom=riel@surriel.com; dmarc=pass (policy=quarantine) header.from=surriel.com ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1791339257; b=hXr1gw5Xk5OfLWXKMMOAeT+wbYLUwhslornPvgIXKV9CLDON1RkQa+cay/FESk56eNy83F NUwS5e1mwwpoaNeDtsVHQ4uwC4iJiohiyfFAsiiLhTI/NDwQFx49Nnq5JfRZYt31i6gnJS m7d+OEU7PrXIU64DoI70LjY3fwSyBz0= ARC-Authentication-Results: i=1; imf08.hostedemail.com; dkim=pass header.d=surriel.com header.s=mail header.b="kTfrxL U"; spf=pass (imf08.hostedemail.com: domain of riel@surriel.com designates 96.67.55.147 as permitted sender) smtp.mailfrom=riel@surriel.com; dmarc=pass (policy=quarantine) header.from=surriel.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1791339257; 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-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=nKyw0L1oOLHL45ZtO7jJ4XCZaQCX2P7sIOr8B24Tems=; b=wCe9Lkp2tu6eyLcaqT0hWWcmLYijCKwYSvfKOJe65jTLYge/475d88h2Ij5O3bZl+j57zw kpGt2GOgWg1W8lq18cV1QraQsZo7su74IK3z0ozVyKpEIsaeAFOkrhBT1LUaxjg9E+nhly /15TX/u4xZMYlFHfpwtD7u8wtcPpWmU= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=surriel.com ; s=mail; h=Content-Transfer-Encoding:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID; bh=nKyw0L1oOLHL45ZtO7jJ4XCZaQCX2P7sIOr8B24Tems=; b=kTfrxL UBDwBQEGO9S2TARCSZdV8q9uIuyj2IS1GEUGdjr07LqQ0eZgV2BS/OWiuy/ufx7+njRJ6xCjICpmh 8EekvkoHdgHFThrKZlLCLsY48YqvfwwC2l67s2Uhc98fsoZX+5bHvbPFxzPHyxGZjSNR8CvuTtj17 HdB+bfL7jKFXmWJA+UmyHvvs/SZgN18U2kL1AXqLmw4vForEmXmzAWtDmxefEfeTKfBdEPOR9pj3G 3Ad52lvUJf1MZajtfdgq/OOue/7Xr3A2A/wr9urZ94a140ELUg0iDheK5uk4VeIavOc4zxhrt7h79 YrrUEALOnID4Zf0fo6Kou8fjb/KQ==; Received: from [2601:18c:8100:a0e0:2541:b86e:2586:d219] (helo=fangorn.surriel.com) by shelob.surriel.com with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.99.5) (envelope-from ) id 1xEH9N-0000000B2cT-0IZQ; Wed, 07 Oct 2026 02:12:57 +0000 From: Rik van Riel To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , Kairui Song , Qi Zheng , Shakeel Butt , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Baoquan He , Baolin Wang , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Mike Rapoport , linux-mm@kvack.org, Rik van Riel Subject: [RFC PATCH 5/5] mm/page_alloc: claim blocks captured for non-movable use Date: Tue, 6 Oct 2026 22:12:50 -0400 Message-ID: <20261007021250.1665929-6-riel@surriel.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20261007021250.1665929-1-riel@surriel.com> References: <20261007021250.1665929-1-riel@surriel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: p96gwupq9wrefkajz3814cs5xbh8xid9 X-Rspamd-Queue-Id: 197D2160007 X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1791339256-811429 X-HE-Meta: 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 I/ByQJ4P nrbMItjdAZTnu0V6FssXqNNjaUnFmrkkdLleMOhVvcIdKJNCa4udgqisQwBzQkyhhTnr3iKJEmAprKCWlwjO/JUxiwS+LYc11rKq9GP1EG+2ID0M3odXqeqqwxas0FZ5q/EfFERIuVLHbBEUW4Bzyvq4l51oQhlZFzF7Nw8cJ9hoUlFB71HBMmNdPsYf3XRkR9WtLjVkb3D/oglB/VQoUHrvraM77yXanO5II8bTg9viChPDl8ZFQcqO5u7FIs1UC4VgEthCelyCo09NmpAl2SRgyqBS/kiJBeScGGg1xpOufjAunn9/ryNz5pnG6av/uNMfS+tMPQ0enhMV+Gp6VVy34o9KKzGa5NK9dnTZJunK1OKhpzq2RFtw+rQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: compaction_capture() hands any merged block to the compacting task with no type change, except it refuses a movable block to a non-movable request below pageblock order. A non-movable request capturing a whole movable block leaves non-movable content in a movable-typed block. Make a non-movable capture claim a movable block: convert it to the request. A partial block cannot be retyped, so the refusal below pageblock order stays; reaching the conversion means a whole block. A movable capture steals: it takes the pages and leaves the type alone. Assisted-by: LLM Signed-off-by: Rik van Riel --- mm/page_alloc.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 16d3594d913a0..edb69d8a74c73 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -728,6 +728,9 @@ static inline struct capture_control *task_capc(struct zone *zone) capc->zone == zone ? capc : NULL; } +static void change_pageblock_range(struct page *pageblock_page, + int start_order, int migratetype); + static inline bool compaction_capture(struct capture_control *capc, struct page *page, int order, int migratetype) @@ -751,6 +754,19 @@ compaction_capture(struct capture_control *capc, struct page *page, capc->migratetype != MIGRATE_MOVABLE) return false; + /* + * A non-movable capture claims a movable block: convert it to + * the request. A movable capture steals: take the pages and + * leave the type alone. Partial movable blocks returned above, + * so reaching here means a whole block. + */ + if (capc->migratetype != MIGRATE_MOVABLE && + migratetype == MIGRATE_MOVABLE) { + change_pageblock_range(page, order, capc->migratetype); + /* Converted whole, so no fragmentation to report below. */ + migratetype = capc->migratetype; + } + if (migratetype != capc->migratetype) trace_mm_page_alloc_extfrag(page, capc->order, order, capc->migratetype, migratetype); -- 2.53.0-Meta