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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> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Rspam-User: X-Rspamd-Queue-Id: 369D7C0008 X-Rspamd-Server: rspam08 X-Stat-Signature: sgmeuarurm485sztc495t94zh6xu14yh X-HE-Tag: 1741568026-303177 X-HE-Meta: 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 HjtaivgQ l1ALRKMgnapj+Ewzz0x3eqcwp4k9Eea8uRmL9Ba+GHEkR1DRMu1ihnQkOmG6ZW1jlCz4WNAiUo3hXVbxpuWgBP2oHeg2u6qQazh7NBXZZq8ctc16nMPUyrlWqwy+XYwXXjy1dxJyIABeL7m8pF5AulqDZbdN63q7Epa9ywOSPJ6H+8E+LxjkMGzJXfSS7wHzzsiPCwIN5PLjjuQL8hqqy2JScXWwqVx2Tt6ag393WWuuyl6sldLf6BxH/VxKRo9ZuHH0zIoaaOEWLfppGUs6BZuw0D1/SowqvME7uhXWJR2MuqenJYt/Bl46lF/gAi9Zd/wCDxIZHfN5PyIrBxPX7LFGhfenoFTuEGRyBIIKoANy+mWotOI4+6X9Puvp/Dv6RMYySbMmHiIcyOp0UwNqqNv6qKQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000196, 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 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