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

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Message-ID: <20250814141513.GG115258@cmpxchg.org>
Date: Thu, 14 Aug 2025 10:15:13 -0400
From: Johannes Weiner <hannes@...xchg.org>
To: Ye Liu <ye.liu@...ux.dev>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Vlastimil Babka <vbabka@...e.cz>, Ye Liu <liuye@...inos.cn>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...e.com>,
	Brendan Jackman <jackmanb@...gle.com>, Zi Yan <ziy@...dia.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/show_mem: Print totalreserve_pages in show_mem output

On Thu, Aug 14, 2025 at 05:26:21PM +0800, Ye Liu wrote:
> 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.

This number isn't used very widely in decision making.

For actual allocations, what matters is watermarks, lowmem_reserve,
highatomic, and cma pages - all of which are already printed out on a
per-zone basis in show_mem().