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 E8C43CD4F21 for ; Tue, 12 May 2026 21:07:30 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 5FB086B00C6; Tue, 12 May 2026 17:07:30 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 5D3336B00C8; Tue, 12 May 2026 17:07:30 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4E9296B00C9; Tue, 12 May 2026 17:07:30 -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 3DF026B00C6 for ; Tue, 12 May 2026 17:07:30 -0400 (EDT) Received: from smtpin07.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 140D41205B9 for ; Tue, 12 May 2026 21:07:30 +0000 (UTC) X-FDA: 84760003860.07.6629611 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by imf24.hostedemail.com (Postfix) with ESMTP id 753BB180006 for ; Tue, 12 May 2026 21:07:26 +0000 (UTC) Authentication-Results: imf24.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b="d/XcsfQn"; spf=pass (imf24.hostedemail.com: domain of mst@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=mst@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1778620047; 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: in-reply-to:in-reply-to:references:references:dkim-signature; bh=RuTcBXOBEgIcnIT/SeHSDJKAZ2vX9yg2mawsRplntmg=; b=Jpg1pjao0VAbzg04SRNHv6c+57KF6j6saiXVM83Rtge2RyN0zZvt2zKMFKQMN/NAvjRs7r wrOFdtQG2Uh4KyYYNi2DKMxDvuUgAd9Z3kCenLJ9scgAj+quMibW6HIg5Kq5XogbQ0Ed3c j9k4clHPLLwM8OjG6dXv1du21YBeSFI= ARC-Authentication-Results: i=1; imf24.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b="d/XcsfQn"; spf=pass (imf24.hostedemail.com: domain of mst@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=mst@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1778620047; a=rsa-sha256; cv=none; b=gXb0UlAXzi8Uyud4sfTUlKX2/O7GaInlOr9uaFlY/KSs4Dhs6AE4IRELNInENmySWgR5uZ jJL9ROxY6K288j3WgH1kwW+6EbHK2u2r2s62xg2PpMBB7gdDuQk2IEQFdp6kB5Gzifz3lX tMz5aPmoQRhA2tygSul1EMIkcgbvvuk= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1778620045; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=RuTcBXOBEgIcnIT/SeHSDJKAZ2vX9yg2mawsRplntmg=; b=d/XcsfQn0hWhqNo2+FbUMhHplDQwwyJQ/GvoyYLzrvSOq+xVEZfAZ0bmVDxJc6NcpTJFiQ OfoTO87lZ+cUsBJo69kbwjOrfvN86Zp62hi4YOM5bEpyF3dS4m+KTB6AB/QzPe1YXEG42U 1bSiFaXilb1Wa2IcOCO3nGurcuRwJrQ= Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-611-UH-a-mjWNraTX4DUFZ5Q6A-1; Tue, 12 May 2026 17:07:22 -0400 X-MC-Unique: UH-a-mjWNraTX4DUFZ5Q6A-1 X-Mimecast-MFC-AGG-ID: UH-a-mjWNraTX4DUFZ5Q6A_1778620041 Received: by mail-wm1-f71.google.com with SMTP id 5b1f17b1804b1-48fb4ffebe7so2908325e9.0 for ; Tue, 12 May 2026 14:07:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1778620041; x=1779224841; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=RuTcBXOBEgIcnIT/SeHSDJKAZ2vX9yg2mawsRplntmg=; b=MrkNtr4x8rUy/hXStTHmAz1RJk0YyckYKVHLIeJPVUN88wk+bW8XSyAHD0VZ2w24DQ ndG0ZZ80AQvKB6nZ/Bgca8WGP2qy2UgtHoQZtRixKF/6LGv69DK3KDfHjIrG0SA3uSry 5GpPn2EShpsjWqYl7gGOTt3dxO1rdfnMc/oRavaMj5LRaDohG+x3ye9/5DSSk7KbIEvd hPkoWhrgDVsuW9CcWO2tRSsI9/DZQsq9gSCJCKNM4LsyoYQsLaiUqqVi7H9QFKjFtrbr rHrHV6g4y02YLNWO/B7tEKM2wtzY4d8sbutcUZC6aOC1tAwTu7K5VR2bSulTBvQCXlsP SASQ== X-Forwarded-Encrypted: i=1; AFNElJ/LKDkWhhfUnNfi3cQ5H3IWsKtHBRtdvuVMlS3js+/U/pm5Si1JMvd96nQHJ4klW7Wd96PtA4DFDQ==@kvack.org X-Gm-Message-State: AOJu0YzOvJ1fDhKpFVpigfJEPnr9tSJUoBqRJ40nQH0utDhKqtL17FZ+ VQUhdiUM/tBIkIsi5CWvfSdvk0HzAbPZ3MS9b/9eYIMpfrCZWR1Pk3egKLP4Hyuy/SuiYaSVLjI yRCWvNHgx4PkSZdtw4JVY5YXdtV++iq2Jq7axqVznkMyhd001F5mT X-Gm-Gg: Acq92OEJimQhFMcqG1oBZ9VUvda+IC6bDcwSD0Eg956HJNsZFf/T1tdAND1bLhUS5Gj JYJhV9+14KVPEu9ClKt6aJv6blWd7ocfWzZWIM+C87EP2GP3khwPqJJnBkDVDc1w3r7ejXBCBzN BfG88lBPWAQSTwYAzBJHCL8uqVxMDgiTHAU0AnVh1JJmOP+x7eyrIWgrq7LH9LbjNN/VfTUCnP8 L4fXUARlr6ehaKrHm0rmpJAgSEtWT7dqQFgYYVl93X1OJeMcU8haQkDRpIJ50IRPcMv65QW9hfz HiQ695jbdfFxkyrkIqZGzupgXQmJ8APhbeoPbVF2bPvLRYJSOyN7kqD/+0KaXVvXQ3/oU74lCrP pykiNhc15DiVzkVkD3FaQEDYE06d2PkhFkyhUQG+h X-Received: by 2002:a05:600c:a011:b0:48a:563c:c8c0 with SMTP id 5b1f17b1804b1-48fc9a0e65emr6519395e9.7.1778620040978; Tue, 12 May 2026 14:07:20 -0700 (PDT) X-Received: by 2002:a05:600c:a011:b0:48a:563c:c8c0 with SMTP id 5b1f17b1804b1-48fc9a0e65emr6518995e9.7.1778620040393; Tue, 12 May 2026 14:07:20 -0700 (PDT) Received: from redhat.com (IGLD-80-230-48-7.inter.net.il. [80.230.48.7]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4548ec6be40sm36486377f8f.12.2026.05.12.14.07.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 May 2026 14:07:19 -0700 (PDT) Date: Tue, 12 May 2026 17:07:15 -0400 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: "David Hildenbrand (Arm)" , Jason Wang , Xuan Zhuo , Eugenio =?utf-8?B?UMOpcmV6?= , Muchun Song , Oscar Salvador , Andrew Morton , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Hugh Dickins , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Christoph Lameter , David Rientjes , Roman Gushchin , Harry Yoo , Axel Rasmussen , Yuanchu Xie , Wei Xu , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , virtualization@lists.linux.dev, linux-mm@kvack.org, Andrea Arcangeli Subject: [PATCH v7 24/31] mm: page_reporting: add flush parameter with page budget Message-ID: <7970645404129ef31ca7035c7d6b5ff960bf14bb.1778616612.git.mst@redhat.com> References: MIME-Version: 1.0 In-Reply-To: X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: a04CUnGEgkZyFtyYzJ4UgcA1WtUCX2qtHEwHw-jR1Pc_1778620041 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 753BB180006 X-Stat-Signature: it51jgwtpdyzm9m8cmbcykqc174gsb5c X-HE-Tag: 1778620046-776098 X-HE-Meta: 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 wbSAofFe s8duj7VmqJDXzGTXLbNhNo3FtcLAHahXW2YLX0MxIbURCGd4iwznZUKPUy0v/n6cUmQX7LWUF5EH/9EMV95ptWy71zdfewM9tsCjw1w6d3P5K3j4wIltVHQWIqfhFZHXpswRMAxJjVHzAgYp+bNBJYKKDPzCLipBWi0jidjGBWTJenOkhrdm58Nka4A0YDPTLKtuUOGa2B2RUgivzKksudHy0hZ2hjs4uX8N2kztfh1cu+gfx/T+xkFbgyngIa/tIhDK+hF695/u2dihl3KuQn9htKk5tRnE5APemm1x6T23WPn9vZ54sk2rn1UXYY7O1Ptb/5rORz11Wtj5F2p+Nm6RjPu4YniYeX2ItEgBK4aeABGZxif8m4OON9jQH1taBsRDINtB0vljXMh/UBWrSNj/Qv6fZ+kRu4w+Ijw6IlmMtSCCiv3XhxS0eh0XqSXGrYT4c Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add a write-only module parameter 'flush' that triggers immediate page reporting. The value specifies a page budget: at least this many pages (at page_reporting_order) will be reported, or all unreported pages if fewer remain. The actual number reported may exceed the budget since each reporting pass processes a full cycle across all zones. This is helpful when there is a lot of memory freed quickly, and a single cycle may not process all free pages due to internal budget limits. echo 512 > /sys/module/page_reporting/parameters/flush Signed-off-by: Michael S. Tsirkin Assisted-by: Claude:claude-opus-4-6 Assisted-by: cursor-agent:GPT-5.4-xhigh --- mm/page_reporting.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/mm/page_reporting.c b/mm/page_reporting.c index 6c957a9daeef..f4a0e27ac7fb 100644 --- a/mm/page_reporting.c +++ b/mm/page_reporting.c @@ -358,6 +358,48 @@ static void page_reporting_process(struct work_struct *work) static DEFINE_MUTEX(page_reporting_mutex); DEFINE_STATIC_KEY_FALSE(page_reporting_enabled); +static int page_reporting_flush_set(const char *val, + const struct kernel_param *kp) +{ + struct page_reporting_dev_info *prdev; + unsigned int budget; + int err; + + err = kstrtouint(val, 0, &budget); + if (err) + return err; + if (!budget) + return 0; + + mutex_lock(&page_reporting_mutex); + prdev = rcu_dereference_protected(pr_dev_info, + lockdep_is_held(&page_reporting_mutex)); + if (prdev) { + unsigned int reported; + + for (reported = 0; reported < budget; + reported += prdev->capacity) { + flush_delayed_work(&prdev->work); + __page_reporting_request(prdev); + flush_delayed_work(&prdev->work); + if (atomic_read(&prdev->state) == PAGE_REPORTING_IDLE) + break; + if (signal_pending(current)) + break; + } + } + mutex_unlock(&page_reporting_mutex); + return 0; +} + +static const struct kernel_param_ops flush_ops = { + .set = page_reporting_flush_set, + .get = param_get_uint, +}; +static unsigned int page_reporting_flush; +module_param_cb(flush, &flush_ops, &page_reporting_flush, 0200); +MODULE_PARM_DESC(flush, "Report at least N pages at page_reporting_order, or until all reported"); + int page_reporting_register(struct page_reporting_dev_info *prdev) { int err = 0; -- MST