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[80.230.25.21]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4891c320084sm125770965e9.2.2026.04.20.05.51.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Apr 2026 05:51:12 -0700 (PDT) Date: Mon, 20 Apr 2026 08:51:10 -0400 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: Andrew Morton , David Hildenbrand , Vlastimil Babka , Brendan Jackman , Michal Hocko , Suren Baghdasaryan , Jason Wang , Andrea Arcangeli , linux-mm@kvack.org, virtualization@lists.linux.dev, Xuan Zhuo , Eugenio =?utf-8?B?UMOpcmV6?= Subject: [PATCH RFC v2 18/18] virtio_balloon: mark deflated pages as pre-zeroed Message-ID: <1b1f7c79ef36716f7819c8e2a65a3d4a1fde3b46.1776689093.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 Mark deflated pages as pre-zeroed when host_zeroes_pages is set. Use put_page_hint() with PGHINT_ZEROED during deflation so the freed pages carry PG_zeroed in the buddy allocator, allowing the next allocation to skip redundant zeroing. Signed-off-by: Michael S. Tsirkin Assisted-by: Claude:claude-opus-4-6 Assisted-by: cursor-agent:GPT-5.4-xhigh --- drivers/virtio/virtio_balloon.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c index 2e524bf6f934..9b35203f579d 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -299,7 +299,10 @@ static void release_pages_balloon(struct virtio_balloon *vb, list_for_each_entry_safe(page, next, pages, lru) { list_del(&page->lru); - put_page(page); /* balloon reference */ + if (host_zeroes_pages) + put_page_hint(page, PGHINT_ZEROED); + else + put_page(page); } } -- MST