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Thu, 14 Aug 2025 07:15:14 -0700 (PDT) Date: Thu, 14 Aug 2025 10:15:13 -0400 From: Johannes Weiner To: Ye Liu Cc: Andrew Morton , Vlastimil Babka , Ye Liu , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Zi Yan , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm/show_mem: Print totalreserve_pages in show_mem output Message-ID: <20250814141513.GG115258@cmpxchg.org> References: <20250814092622.24535-1-ye.liu@linux.dev> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250814092622.24535-1-ye.liu@linux.dev> X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 35B388000D X-Stat-Signature: 7ds4nbrz47x11ycieqtit3b79eqhkdoj X-HE-Tag: 1755180916-459067 X-HE-Meta: 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 hsg/yeat 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 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: On Thu, Aug 14, 2025 at 05:26:21PM +0800, Ye Liu wrote: > From: Ye Liu > > 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().