Fast timing v26#72
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In some cases its needed to understand whether TSC frequency data was sourced from CPUID, and which of the registers. This shows this debug information at the end of pg_test_timing, through use of a new pg_timing_tsc_clock_source_info function, replacing the previous pg_tsc_calibrate_frequency export that was only needed for debug info. Author: Lukas Fittl <lukas@fittl.com> Suggested-by: Andres Freund <andres@anarazel.de> Discussion: https://www.postgresql.org/message-id/flat/jr4hk2sxhqcfpb67ftz5g4vw33nm67cgf7go3wwmqsafu5aclq%405m67ukuhyszz#2fdfd95b6a4a74410196999818e16cfc
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