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Sun, 09 Mar 2025 17:53:44 -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 98e67ed59e1d1-2ff4e7737a5sm8619525a91.13.2025.03.09.17.53.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 09 Mar 2025 17:53:43 -0700 (PDT) Date: Sun, 9 Mar 2025 17:53:42 -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 1/3] mm/page_alloc: Add trace event for per-zone watermark setup In-Reply-To: <20250308034606.2036033-2-liumartin@google.com> Message-ID: <31e46f74-c6eb-58d9-bad6-518d96de7d96@google.com> References: <20250308034606.2036033-1-liumartin@google.com> <20250308034606.2036033-2-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 the `mm_setup_per_zone_wmarks` trace event, > which provides detailed insights into the kernel's per-zone watermark > configuration, offering precise timing and the ability to correlate > watermark changes with specific kernel events. > > While `/proc/zoneinfo` provides some information about zone watermarks, > this trace event offers: > > 1. The ability to link watermark changes to specific kernel events and > logic. > > 2. The ability to capture rapid or short-lived changes in watermarks > that may be missed by user-space polling > > 3. Diagnosing unexpected kswapd activity or excessive direct reclaim > triggered by rapidly changing watermarks. > > Signed-off-by: Martin Liu Acked-by: David Rientjes