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[80.230.25.21]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43fe4e59f97sm32291619f8f.37.2026.04.20.05.50.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Apr 2026 05:50:34 -0700 (PDT) Date: Mon, 20 Apr 2026 08:50:32 -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, Johannes Weiner , Zi Yan Subject: [PATCH RFC v2 05/18] mm: page_alloc: preserve PG_zeroed in try_to_claim_block Message-ID: <0be843ccdd029d61887f199123cce216dcbbdead.1776689093.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: oHnjcmSC_qbKVnJp3Jc3J9kLL5AO8Ulny6RNth3McIk_1776689436 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline try_to_claim_block() calls expand() with false for both reported and zeroed, losing the zeroed state for claimed pageblocks. Capture reported and zeroed state before del_page_from_free_list() clears PageReported, and pass them to expand() for sub-page propagation. Signed-off-by: Michael S. Tsirkin Assisted-by: Claude:claude-opus-4-6 Assisted-by: cursor-agent:GPT-5.4-xhigh --- mm/page_alloc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 6adc894748c8..b0971a1eaa73 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2345,11 +2345,13 @@ try_to_claim_block(struct zone *zone, struct page *page, /* Take ownership for orders >= pageblock_order */ if (current_order >= pageblock_order) { unsigned int nr_added; + bool was_reported = page_reported(page); + bool was_zeroed = PageZeroed(page); del_page_from_free_list(page, zone, current_order, block_type); change_pageblock_range(page, current_order, start_type); nr_added = expand(zone, page, order, current_order, start_type, - false, false); + was_reported, was_zeroed); account_freepages(zone, nr_added, start_type); return page; } -- MST