From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 2AC4E3BF66C for ; Wed, 20 May 2026 22:23:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779315828; cv=none; b=BOZVckSveaFuvNKTuanX5mv0bMqz7bLA4SHTf7JP21o24UpBzx42UN7IUwc8zo+Zak3TNwYq4sYxFRT+1R3bGk7PVGXYTc+IR9uDGaDyPMLmw0ZrNYX/qozfY/YErWWQjIy5belprHqESL11McU2s0XDj+d7vbuFU1+uZKqA5+4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779315828; c=relaxed/simple; bh=p/E5hRnS5VZWIkTtV/Cpgy5sbv8MptFrLHFQQR1g+04=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=mjwzplxtmROK7KtDINVflNMnaamQHQVFkg4eECJIlbHHYttNxoWuskxYrOoRGr0SZwtbM3mMv9GoLtXIcFmKDWbNzk3w3KNQwTOevnH/m8BtEfGrnlz89LIRMfvHSZXCV+lyqu++dPyeKIZ0SAqcDxUmEETbaZFr+DUifkP4VQc= 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=DkmY1d18; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b=bdFCwt9H; arc=none smtp.client-ip=170.10.133.124 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="DkmY1d18"; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b="bdFCwt9H" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1779315826; 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=K72Es9G8n7K8ecgoDN9zfD/eO+Zd/boK65D6pcX9pF4=; b=DkmY1d18mGktbE6OtmtMa3JI6U5xYmmgO3Vxv+5M7D3aAkb4sJT/XgaLTVikIdeRTX4tE/ VHu8kbdYVm9D7Pi0lN0nd+h3vzXshIbqJywA55+CS0h80rsZpRmHGVWgI86OgKrs7+CbYF oioGWAB/SPHL5BUyjgdpR/0iksm4VIo= Received: from mail-wm1-f70.google.com (mail-wm1-f70.google.com [209.85.128.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-604-sXBNJ1zQO0OrH2zWx_SyqQ-1; Wed, 20 May 2026 18:23:44 -0400 X-MC-Unique: sXBNJ1zQO0OrH2zWx_SyqQ-1 X-Mimecast-MFC-AGG-ID: sXBNJ1zQO0OrH2zWx_SyqQ_1779315823 Received: by mail-wm1-f70.google.com with SMTP id 5b1f17b1804b1-48e89faa62eso32669535e9.1 for ; Wed, 20 May 2026 15:23:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=google; t=1779315823; x=1779920623; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=K72Es9G8n7K8ecgoDN9zfD/eO+Zd/boK65D6pcX9pF4=; b=bdFCwt9H0yN9elfKoVcfkNJx4vS5+yLhpfmVdqQVI52uHkcYlI3Xrp6vBBVBCYCbYP hcXHvAgfN/UYMHJkPG9z6U3zDuW8VVOrOeLmO1FO7nSA7DPmTI5f+gZN0Pt1wooE+psv ipeMTX3QfHRDaEqKNRa0dJnYZXH71E3AaMOKRrxVTJ6/8+m6nF6tId3aJgmao3e6HAlS ABinoqKNqv9KM2e8Y9aJDqmEmM2Z6VjspwYbaRD+FERAl6UfUqYq9keTT6demswBnvA7 25MAcQw1CGhECoWunOBlpGi4a9EaS7EU8Rr13zFICdZ9bmVr9sZq1ZScECq2Zp7uzqmP xQAw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1779315823; x=1779920623; 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=K72Es9G8n7K8ecgoDN9zfD/eO+Zd/boK65D6pcX9pF4=; b=KJNe2aflfnGU7x9eSLoDflPRQI0t5uls6lSrcQQMD24xozAy9nbdBSUgKiYmXhb2Pa w4I6tn0n6EthkVNoOwSyNpMlNg1hO/mxoHY99jp5vGeET+Fws7dsNLFpZUe8ZaMo8RQ+ p1gFpuEhlqPOF9lAK98+kv1OEFBLmY8Weq0nJoKrALnEng0hSjriGHfC/SXp0Z1Fe7aM pqtNIixqK6jpQgY0fbymgIMsUX770LdAcaONnKwBDCmzMcRX5BbN4HNFMUZ+ouqCfzk8 pexUggawb6nMOW7tmMXVAnmPZzqwEmZg42xgNgZ2EEykWPn35Bu5uXOdD87vU/EZRq9c JXuA== X-Gm-Message-State: AOJu0Yx4ZUk2UTOJMMcyv5GA9pWuE9Cpes7gIm3S3rzQ8A706i0geA5v OTLnLgN2ThlvT0SpHKtKPUQXNsfYN53kEMDcumSa6SRm0+zkORXiZTFEa6RnJg5h257gTLgoAMB EdF2NQZlLWMLTRuGh//hfYd1O1nswaqqpKeo8//6/YCXWcq3YZZJOrzBujtsczA4dsbXr1EaTyQ wWewsoEcqS0jbb/IS+66t0ZWi6Q8g7iQ7nN0CLYpmCNqU= X-Gm-Gg: Acq92OGwyvLPTGpIZKzZ6QhmZip3hHwVkyUWmmLN77oD17glzz0q5FcNLxC/b/z25U6 nWWpTIYrn0VJtNYfundJkFJNho5/ug9j8FzyoxqP2mnYVzJ+9OqR1MhKsLIouLzJvT7KYKNiz/P 3/8EMsBW415k4QlkHpcl+S5DNeAWcywceA9hLV6WvleI3Z0qwoeiUi1V/F3jsziGN2lZd6eFly8 I3pWr9KXl1ux0G+4gZKCeUL1d5B/r34M7QM8lJ+ju3BP8+dskaisUPsY0dsaY9fPTdRxm50Ulop jG73uGETTccZC05Iav6upqGrV3zMks4F8mtrEBUH7GBHdVkTBmSZNaf6ArxT3hqSVi8RfseLk2x u7uwIvPYywzfopRfB8R104v7W7wvTNhmvM6YXEfY6XUg= X-Received: by 2002:a05:600c:858d:b0:48f:f7cc:f703 with SMTP id 5b1f17b1804b1-490360e4c2amr1777965e9.30.1779315823447; Wed, 20 May 2026 15:23:43 -0700 (PDT) X-Received: by 2002:a05:600c:858d:b0:48f:f7cc:f703 with SMTP id 5b1f17b1804b1-490360e4c2amr1777275e9.30.1779315822889; Wed, 20 May 2026 15:23:42 -0700 (PDT) Received: from redhat.com (IGLD-80-230-25-45.inter.net.il. [80.230.25.45]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49033d58838sm19711575e9.11.2026.05.20.15.23.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 May 2026 15:23:42 -0700 (PDT) Date: Wed, 20 May 2026 18:23:38 -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 v8 37/37] mm: balloon: use put_page_zeroed for zeroed balloon pages Message-ID: <61af3e2e956952715b26b51be4afa4ca573ab631.1779315441.git.mst@redhat.com> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent When a balloon page marked PageZeroed is freed during migration, use put_page_zeroed() to propagate the zeroed hint to the buddy allocator. Previously the hint was silently lost via plain put_page(). Signed-off-by: Michael S. Tsirkin Assisted-by: Claude:claude-opus-4-6 --- mm/balloon.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/mm/balloon.c b/mm/balloon.c index 96a8f1e20bc6..6c9dd8ab0c5d 100644 --- a/mm/balloon.c +++ b/mm/balloon.c @@ -324,7 +324,15 @@ static int balloon_page_migrate(struct page *newpage, struct page *page, balloon_page_finalize(page); spin_unlock_irqrestore(&balloon_pages_lock, flags); - put_page(page); + if (PageZeroed(page)) { + /* Atomic to serialize with memory_failure's + * TestSetPageHWPoison; not under zone->lock here. + */ + ClearPageZeroed(page); + put_page_zeroed(page); + } else { + put_page(page); + } return 0; } -- MST