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 b+eGqiSU 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, 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 11/12/25 10:50, Andrew Morton wrote: > On Mon, 10 Nov 2025 16:19:54 -0500 Steven Rostedt wrote: > >> On Thu, 16 Oct 2025 16:46:19 +1100 >> Balbir Singh wrote: >> >>> Add tracepoints for debugging device migration flow in migrate_device.c. >>> This is helpful in debugging how long migration took (time can be >>> tracked backwards from migrate_device_finalize to migrate_vma_setup). >>> >>> A combination of these events along with existing thp:*, exceptions:* >>> and migrate:* is very useful for debugging issues related to >>> migration. >>> >> >> ... >> >>> hmm-tests-855 [002] 50.042800: set_migration_pmd: addr=7f2908a00000, pmd=dfffffffd39ffe00 >>> hmm-tests-855 [002] 50.062345: remove_migration_pmd: addr=7f2908a00000, pmd=efffffe00403fe00 >> >> Each TRACE_EVENT() is equivalent to: >> >> DECLARE_EVENT_CLASS(event, ...) >> DEFINE_EVENT(event, event, ...) >> >> Where a class is around 4-5K in size, and the DEFINE_EVENT is between >> 500 and 1k in size. >> >> By using a single DECLARE_EVENT_CLASS() for multiple events, you can save >> several thousands of bytes of memory. > > Thanks for the detailed review. I'll drop this version of the patch. Thanks Steve and Andrew! I've been looking at EVENT_CLASSES and looking for the savings you mentioned. I've not yet finished my patch, I will resend it as soon as I have a new version Balbir