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Sun, 09 Mar 2025 17:54:00 -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 d2e1a72fcca58-736c7ac6e11sm2487943b3a.148.2025.03.09.17.53.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 09 Mar 2025 17:54:00 -0700 (PDT) Date: Sun, 9 Mar 2025 17:53:59 -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 2/3] mm/page_alloc: Add trace event for per-zone lowmem reserve setup In-Reply-To: <20250308034606.2036033-3-liumartin@google.com> Message-ID: <611025a1-d6aa-57a9-5848-73874eee0dba@google.com> References: <20250308034606.2036033-1-liumartin@google.com> <20250308034606.2036033-3-liumartin@google.com> Precedence: bulk X-Mailing-List: linux-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_lowmem_reserve` trace > event,which provides detailed insights into the kernel's per-zone lowmem > reserve configuration. > > The trace event provides precise timestamps, allowing developers to > > 1. Correlate lowmem reserve changes with specific kernel events and > able to diagnose unexpected kswapd or direct reclaim behavior > triggered by dynamic changes in lowmem reserve. > > 2. know memory allocation failures that occur due to insufficient lowmem > reserve, by precisely correlating allocation attempts with reserve > adjustments. > > Signed-off-by: Martin Liu Acked-by: David Rientjes