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b=dcDHKgwsR1xJpgn6fXlYuN1JaRr1dqzEPzp15c05Qa+I67e8SEcomezzpwOTaEdeK R2fftdQcfxVkwmRpsWyitS9WSl+yUtyD9lnf8JEzxy5yutIfz5c2ANYGiK4P07/rhW /owETnOBEu3Zyi1bt9koLxaoMFzlWegzl1mCNV/Fv4hXV6zZzkCGXwewmnw5FxqBGy kpsctY9kMQQi1CznF0KT5vlqXn00U8AZs8airKAYCHUUO5u0ebtFZtjhxvJTgtia8d 5kibv9JKQZB+wnkuhdoeeeFBcgLDqest5Tl3/5cjpGg2m9sa9g/t6SrY8FHl/sxY9D Pc15ec/H4mbrA== From: SeongJae Park To: Steven Rostedt Cc: SeongJae Park , Andrew Morton , Masami Hiramatsu , Mathieu Desnoyers , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org Subject: Re: [RFC PATCH v2 18/28] mm/damon: trace probe_hits Date: Wed, 13 May 2026 19:08:12 -0700 Message-ID: <20260514020812.149894-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260513203237.3b1b3286@gandalf.local.home> References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: B4CAB4000D X-Stat-Signature: c11mhj9a191e714gk9hdxx8jqwx8skg8 X-HE-Tag: 1778724502-919633 X-HE-Meta: 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 E1My1MMy Z0d3hAOpcpZgQcsvZzDOPsxp4jRp4DkHXSp3JIwHlzlJ6R45vsL8sQ0tMNuDCDOiTEEQmVXR9XUFr2Euw6LbDzFdCcZ2q0HraYhU9HzNaIxRF8g+lG4PJt6lzIJ7qP433G+y+uP8Z6Sf8Urio/7n+2O2lmmLTsIG78x11hDn643xwWBSVYDtvfk5J5aL4H51ot1PrYpzy6E8sg2ZzQ3ldXiSpbj9b14PcWYAJIo+zSjYhBtCsnMffDKWv4ymVjiNV4Hq2s3K7Jvx8wakVwvFvKpmto2DairCuwW/AAUSPtduUPQNgAgr0BtT4Mx5zKaZFph6ZHN0/use8W4M= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, 13 May 2026 20:32:37 -0400 Steven Rostedt wrote: > On Wed, 13 May 2026 17:06:10 -0700 > SeongJae Park wrote: > > > Btw, if you don't mind, may I ask your opinion about the name having '_v2' > > suffix? I chose that as an RFC phase temporal name that doesn't break the > > compatibility, planning to give it a better name later. But I start feeling > > just extending the original one might be another option because tracepoints are > > not strict stable ABI to my understanding, and the change of the TP_prink > > format should be simple enough (append the probe_hits= part) that the user > > space could reasonably deal with. > > It's only a stable ABI if some useful userspace tooling depends on it. > Otherwise, feel free to change. Makes perfect sense, thank you Steven! > > Nothing really should be parsing the TP_printk() format part as it is > really inefficient to do so. That's why I created libtraceevent and > libtracefs to do the parsing of the raw data for you. I will try to make DAMON user-space tool directly uses those. At the moment, it is lazily parsing trace-cmd or perf outputs. Thanks, SJ [...]