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Sat, 12 Sep 2026 23:37:40 -0700 (PDT) Received: from ydg-Zenbook-14-UM3406GA ([2001:2d8:7f00:8c85:b91:ff81:c860:362e]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cc4c6585f94sm3253291a12.25.2026.09.12.23.37.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 12 Sep 2026 23:37:39 -0700 (PDT) From: Donggeun Yoo To: sashiko-reviews@lists.linux.dev Cc: linux-trace-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Jens Axboe , Steven Rostedt , Masami Hiramatsu , Adriano Cordova , donggeunyoo.kernel@gmail.com Subject: Re: [PATCH] blktrace: build the synthesized v1 record from the entry's own layout Date: Sun, 13 Sep 2026 15:37:34 +0900 Message-ID: <20260913063734.708896-1-donggeunyoo.kernel@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260913031030.E85191F000FF@smtp.kernel.org> References: <20260913025827.457116-1-donggeunyoo.kernel@gmail.com> <20260913031030.E85191F000FF@smtp.kernel.org> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Sun, 13 Sep 2026 03:10:30 +0000, sashiko-bot@kernel.org wrote: > - [Medium] Size-based differentiation between v1 and v2 events causes v1 > entries with a large PDU (>= 16 bytes) to be misidentified as v2 entries, > scrambling output fields and truncating the PDU. Correct. A v1 record carrying a 16-byte BLK_TA_REMAP PDU is 64 bytes, the size of a v2 record, and nothing else in the entry tells them apart. v2 drops the size test and depends on Adriano Cordova's "blktrace: always record ftrace events as blk_io_trace2" instead: https://lore.kernel.org/all/20260913063155.708520-1-donggeunyoo.kernel@gmail.com/