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Sun, 09 Mar 2025 17:54:17 -0700 (PDT) Received: from [2a00:79e0:2eb0:8:ee55:e440:a203:909f] ([2a00:79e0:2eb0:8:ee55:e440:a203:909f]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-224109ddfc7sm65423905ad.22.2025.03.09.17.54.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 09 Mar 2025 17:54:16 -0700 (PDT) Date: Sun, 9 Mar 2025 17:54:16 -0700 (PDT) From: David Rientjes To: Martin Liu cc: Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Andrew Morton , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v2 3/3] mm/page_alloc: Add trace event for totalreserve_pages calculation In-Reply-To: <20250308034606.2036033-4-liumartin@google.com> Message-ID: <273ca5ee-c01b-83d3-6bbd-21ec4401e78b@google.com> References: <20250308034606.2036033-1-liumartin@google.com> <20250308034606.2036033-4-liumartin@google.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII On Sat, 8 Mar 2025, Martin Liu wrote: > This commit introduces a new trace event, > `mm_calculate_totalreserve_pages`, which reports the new reserve value > at the exact time when it takes effect. > > The `totalreserve_pages` value represents the total amount of memory > reserved across all zones and nodes in the system. This reserved memory > is crucial for ensuring that critical kernel operations have access to > sufficient memory, even under memory pressure. > > By tracing the `totalreserve_pages` value, developers can gain insights > that how the total reserved memory changes over time. > > Signed-off-by: Martin Liu Acked-by: David Rientjes