From nobody Fri Sep 25 11:08:19 2026 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 68EC11E7660; Mon, 14 Sep 2026 02:46:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789353966; cv=none; b=Ygxt/epW+TMuaZa7cnNl20jRwwZKP/h/teSpLMj/oJ0h8HF4ZOIwWPDtAo1QolRxc2U7RggyBN1COJpTDD9txrBf7eSVvo4jL31RRyYNt474iDXCNQMfjUJl5IQRLpt89KqifeAn6TXGqIuOarANCr8qfqNIIrVO/gvxZThx0XU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789353966; c=relaxed/simple; bh=qK+5lPCa8HUX5/ezxo8mKK0h5kxCv4PDkQne1qYc3z8=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=vBQc925poUT7jvO2gvf1NQcTnEsuRgEE0Z0cWQ36jyOM8/KgbzVKsbARPjpSCEuDBcaDi6TZ8QkenBc9A5O04iJtzWoTMvZKA2A4h6DTGC6C6p1Hmybok9qCvXLzRdl1W8BKo/iJVZCHqRUD1jFwEwTUKeuAhl0TN5NTSp2Yirk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=kylinos.cn; arc=none smtp.client-ip=124.126.103.232 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kylinos.cn X-UUID: 6ad32522afe611f19a56ed5b684f684d-20260914 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.19,REQID:bbe0c4a3-3b29-4f5b-9302-20e446aab4f0,IP:0,U RL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:0 X-CID-META: VersionHash:7db8b62,CLOUDID:828b17566f75bd7eb8976c8866957840,BulkI D:nil,BulkQuantity:0,SF:102|850|865|898,TC:nil,Content:0|15|50|99,EDM:-3,I P:nil,URL:0,File:nil,RT:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0 ,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: 6ad32522afe611f19a56ed5b684f684d-20260914 X-User: liuqiqi@kylinos.cn Received: from localhost.localdomain [(10.44.16.150)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA with TLSv1.3 TLS_AES_256_GCM_SHA384 256/256) with ESMTP id 1935826873; Mon, 14 Sep 2026 10:45:59 +0800 From: Qiqi Liu To: akpm@linux-foundation.org, vbabka@kernel.org Cc: surenb@google.com, mhocko@suse.com, brendan.jackman@linux.dev, hannes@cmpxchg.org, ziy@nvidia.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Qiqi Liu , stable@vger.kernel.org Subject: [PATCH] mm/page_alloc: apply per-task GFP context in bulk allocator Date: Mon, 14 Sep 2026 10:45:55 +0800 Message-Id: <20260914024555.138125-1-liuqiqi@kylinos.cn> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" alloc_pages_bulk_noprof() does not call current_gfp_context(), so per-task scoped allocation constraints (PF_MEMALLOC_NOIO, PF_MEMALLOC_NOFS, PF_MEMALLOC_PIN) are not applied on the bulk fast path. The most direct consequence is PF_MEMALLOC_PIN: without clearing __GFP_MOVABLE, prepare_alloc_pages() selects MIGRATE_MOVABLE for the PCP list, and a task under memalloc_pin_save() receives movable pages from the bulk allocator. Fixes: 387ba26fb1cb ("mm/page_alloc: add a bulk page allocator") Cc: stable@vger.kernel.org Signed-off-by: Qiqi Liu --- mm/page_alloc.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 12fac9084c48..3be7288a1aa7 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5207,6 +5207,7 @@ unsigned long alloc_pages_bulk_noprof(gfp_t gfp, int = preferred_nid, =20 /* May set ALLOC_NOFRAGMENT, fragmentation will return 1 page. */ gfp &=3D gfp_allowed_mask; + gfp =3D current_gfp_context(gfp); if (!prepare_alloc_pages(gfp, 0, preferred_nid, nodemask, &ac, &gfp, &all= oc_flags)) goto out; =20 --=20 2.25.1