linux-kernel - [PATCH] mm/show_mem: Print totalreserve_pages in show

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Message-ID: <20250814092622.24535-1-ye.liu@linux.dev>
Date: Thu, 14 Aug 2025 17:26:21 +0800
From: Ye Liu <ye.liu@...ux.dev>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Vlastimil Babka <vbabka@...e.cz>
Cc: Ye Liu <liuye@...inos.cn>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...e.com>,
	Brendan Jackman <jackmanb@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Zi Yan <ziy@...dia.com>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] mm/show_mem: Print totalreserve_pages in show_mem output

From: Ye Liu <liuye@...inos.cn>

Add totalreserve_pages to the main show_mem output line for easier
debugging and memory analysis. This helps developers and
administrators quickly see how many pages are reserved by the kernel
and not available for user allocations.

Signed-off-by: Ye Liu <liuye@...inos.cn>
---
 mm/show_mem.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/mm/show_mem.c b/mm/show_mem.c
index 41999e94a56d..c56d5599de45 100644
--- a/mm/show_mem.c
+++ b/mm/show_mem.c
@@ -201,7 +201,8 @@ static void show_free_areas(unsigned int filter, nodemask_t *nodemask, int max_z
 		" mapped:%lu shmem:%lu pagetables:%lu\n"
 		" sec_pagetables:%lu bounce:%lu\n"
 		" kernel_misc_reclaimable:%lu\n"
-		" free:%lu free_pcp:%lu free_cma:%lu\n",
+		" free:%lu free_pcp:%lu free_cma:%lu\n"
+		" totalreserve_pages:%lu\n",
 		global_node_page_state(NR_ACTIVE_ANON),
 		global_node_page_state(NR_INACTIVE_ANON),
 		global_node_page_state(NR_ISOLATED_ANON),
@@ -221,7 +222,8 @@ static void show_free_areas(unsigned int filter, nodemask_t *nodemask, int max_z
 		global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE),
 		global_zone_page_state(NR_FREE_PAGES),
 		free_pcp,
-		global_zone_page_state(NR_FREE_CMA_PAGES));
+		global_zone_page_state(NR_FREE_CMA_PAGES),
+		totalreserve_pages);
 
 	for_each_online_pgdat(pgdat) {
 		if (show_mem_node_skip(filter, pgdat->node_id, nodemask))
-- 
2.43.0