From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 17E2D3C0A18 for ; Tue, 12 May 2026 21:07:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778620047; cv=none; b=OXWOOqerq60Nr1CZWOG2SMGPVKZhdZ0GHCgsHc3P4yIaZHXskUxfid3gpTkgvviNU+oK/QJJ+PkdPt+Oj8SzmFUvRgXt4y0/seXsb1wsF/UnqIhve+Pkh1pC78GReY3W0slXL5VrcyA/ghseDZUiLbATWk5uEanau7kPApY8Vaw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778620047; c=relaxed/simple; bh=gA+GhqYvwNlglcAAc+7safd3uN5pLfpD+OD4nI/Ceeg=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: In-Reply-To:Content-Type:Content-Disposition; b=u/7M2Kg30Yy4x+r6Cc61kQDScMQdKi1eSNdCMaRkxABYJtt0tOsH4+s5P4XcppmXNNBGHbURJrq3/ERnnN4VQ1ERtrVAgsqpxvA+agbNLk9K23vZj+5LxOQcHPcsnofcagEBfgBSadhPmSyO5KtqfiyKbE50Y6q8Qz/fTrbzQt8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=d/XcsfQn; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="d/XcsfQn" 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-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-611-rXF-Vz9NNsiC-jlPxbPdOg-1; Tue, 12 May 2026 17:07:22 -0400 X-MC-Unique: rXF-Vz9NNsiC-jlPxbPdOg-1 X-Mimecast-MFC-AGG-ID: rXF-Vz9NNsiC-jlPxbPdOg_1778620041 Received: by mail-wm1-f69.google.com with SMTP id 5b1f17b1804b1-486fa07f2bbso35896185e9.2 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=q5SJCrdouAp6Gt93gXyFN3RRNzMxDrjjm/EAC0ZkqLqfcIegE+5Bi1/2KsJGjC+/sJ lfesFbp1RXmshbP3Zb2G7PnO+01YTrqYxPlbOZuQmKTfMJHjV7r0BjyuTxTzSce9GkH4 YIVHGQeqpEJPk1muqQlHxAfo+tqKhnvDwThKiwwB+WEtBAuK/FAdtfsxdzwqC/G42wFj 8LWB+03/QAVXRuvbD1RpB7wqQXIeMjDJlRjOjzc7wwyvX89HVym3UUNIjYbtZ9hG1hyX b7xSEBE4nZ138rYThATQUfG9KPJaK4jKcmjcdaVtUyzh6YVXwWxHFW8GZBbPcu8W4e4g zVYw== X-Forwarded-Encrypted: i=1; AFNElJ+Q51curRN/SVTvyLpLKZEApzoExMPgKQ4S/8HAVyytQZlkGT88Jo8+z18ZtPDbkZFbMAmDPsBB3a2eYBUVzg==@lists.linux.dev X-Gm-Message-State: AOJu0Yzvb45V6Se+YeLl3r0jLVwk8dyqRRGVOY567eSqInuwhKNX/Ltz P4q5J++/M9s63j2iLRMa7L7XdWB+2v9Yzl42B45x7a2LMGiAmtRQnmIjC/yMfX2LiesU0lAN1xl EsAkDWWUFZZKMX0vmtsZzQEJy0u53qofEzL6uIkD+/jp/X9dN9L588wUBkZKTRyWVd9M9 X-Gm-Gg: Acq92OHq642jGC0Q7YTrHgGrc1k7t/J0HjnFkqm6NibSe6cB/BgTYXezOHghT0rhyfm cyCY9hY+9eT9ubhu+84zmR5uQhQGCx6pd5xwwgLImeyg5esXiPT11JXrzDFdz7MmC+DYzaEOy3x WXDH6edBYaOrhAykCjnq4Nx1C673RKX6CUVgJxAp0jgzIx+kP9WkQoXKky2bVG+uSQcuNJXBh6N 5FjF9AnYJvCpcbGdpIkMM7HQfLsKqLTOBmUl6d8Pa+Q5DH6QyrRHhGb5uJymQXSWNRUyZNzhoSv Z5fK61MOoU9bAUGe3dpE1juSSHVP5i9I+A4fOoCF3sKwFNVkOuDIdAsT5RWX9eZ36fgyWjYBlfa MIvckjtTtf0ngb0LAiEAgb9ZtFplH5yQaINJqAPm1 X-Received: by 2002:a05:600c:a011:b0:48a:563c:c8c0 with SMTP id 5b1f17b1804b1-48fc9a0e65emr6519475e9.7.1778620040984; 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: Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: 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: LpDE3rdOIjafYJbj2YBMzU2W8vq_StwJIzlUPzgDcDA_1778620041 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline 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