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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1758179874; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=njN97PvBPLC4bDZRs8q/T0cTu4eF2v+Wk3jFZfVWHnw=; b=m3iQCM2TOJA+kmwLLav6k0tpHUtNL0IBO87TXdQfOVw4AG2EYcVb6OGbJ0WG7CRdyF/bFr a51psNoJIanaLFs9imtLLnJBQyM03SrVwmYeQ+MxEPlJkoyH4IjcuBBbQqECJAbWNNzNYr MvZH82gNkKZ0m2BkQ1C43r9Tpr8o7ec= From: Ye Liu To: Andrew Morton , David Hildenbrand Cc: Ye Liu , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH] mm/vmstat: add header line to /proc/buddyinfo output Date: Thu, 18 Sep 2025 15:17:40 +0800 Message-ID: <20250918071741.526280-1-ye.liu@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 09326A0004 X-Stat-Signature: 7cisx3jnayhz4e5qrumw5pbhti34ok5b X-Rspam-User: X-HE-Tag: 1758179876-974697 X-HE-Meta: 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 O05I9gEg pmn80q/PF0MtpTf7uxfV3q7NO8ZWbPpYML9ZuJdd4XHeWSMl4jtXSbG1EQfCe19+zvE8VN6Kn50BC1dxp3hUHKQ6s43HzTwSP3rVRdhf0TE+W/AXPo0z0L5OqOFZuRcMXyrNihk48RDMeCV32XvnabgXQyDBsZ6yH3ZLh6d0pWP7Y9sSz251Z6DWZHFB4nwUQswSL X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Ye Liu Add a header line to /proc/buddyinfo that shows the order numbers for better readability and clarity. Before: Node 0, zone DMA 0 0 0 0 0 0 0 ... Node 0, zone DMA32 5 8 6 6 7 5 8 ... Node 0, zone Normal 1113 351 138 65 38 31 25 ... After: Free pages per order 0 1 2 3 4 5 6 ... Node 0, zone DMA 0 0 0 0 0 0 0 ... Node 0, zone DMA32 5 8 6 6 7 5 8 ... Node 0, zone Normal 1113 351 138 65 38 31 25 ... Signed-off-by: Ye Liu --- mm/vmstat.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/mm/vmstat.c b/mm/vmstat.c index bb09c032eecf..e9606457ab91 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1574,7 +1574,14 @@ static void frag_show_print(struct seq_file *m, pg_data_t *pgdat, */ static int frag_show(struct seq_file *m, void *arg) { + int order; pg_data_t *pgdat = (pg_data_t *)arg; + /* Print header */ + seq_printf(m, "%-21s ", "Free pages per order"); + for (order = 0; order < NR_PAGE_ORDERS; ++order) + seq_printf(m, "%6d ", order); + seq_putc(m, '\n'); + walk_zones_in_node(m, pgdat, true, false, frag_show_print); return 0; } -- 2.43.0