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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: 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: D_D7kApreFwny-15VRS_EvH5PUWczZqpFaxXamZdLRc_1776689436 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Stat-Signature: rapif35x7ftxwox7bzqdp6enewg9kdm1 X-Rspamd-Queue-Id: 1683FC000F X-Rspam-User: X-Rspamd-Server: rspam06 X-HE-Tag: 1776689438-197506 X-HE-Meta: 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 U0J8AU20 MYKfuLKfYftrYAP48QnoNcmiAiT4q3isSKxT7T6+UvntyQKYvUoiBv3qcA/btmcCtBh2ZlP2e8+WDei6WQud10PQZmULXYUv90DB3Mr08NDtQu3kzLqap/GvmEL8+7rxfF9vE9nhKCUT5y5KCibqXCXTUoT+9gSUfIjX3AN02J7s30g0RlLb9bdjC/Q3Norq5DxV4qdyICkni3luVkEEtcgzeeXWxvsJolWVzVj7GfIGLxsr7pl1MvXKAoScZihYwQg3GttwXLKHkICF7jOdK/3SnnNHTcuZgM1uwwvwo16D2IbUM4I2yYHtDqR05os3LTNpBnerSjUudJHJoUz7+udTXlBMrHVupImCKfwXOteSoE53ELgX3n6G9M0Z9ZXhb2l29Ex+HzEKXjIn20BHIDetHMOv4psFV6oNS Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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