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bcb2cf41f9
This adds additional x86 specific CPUID checks for flags needed for determining whether the Time-Stamp Counter (TSC) is usable on a given system, as well as a helper function to retrieve the TSC frequency from CPUID. This is intended for a future patch that will utilize the TSC to lower the overhead of timing instrumentation. In passing, always make pg_cpuid_subleaf reset the variables used for its result, to avoid accidentally using stale results if __get_cpuid_count errors out and the caller doesn't check for it. Author: Lukas Fittl <lukas@fittl.com> Author: David Geier <geidav.pg@gmail.com> Author: Andres Freund <andres@anarazel.de> Reviewed-by: Andres Freund <andres@anarazel.de> Reviewed-by: David Geier <geidav.pg@gmail.com> Reviewed-by: John Naylor <john.naylor@postgresql.org> Reviewed-by: Jakub Wartak <jakub.wartak@enterprisedb.com> (in an earlier version) Discussion: https://www.postgresql.org/message-id/flat/20200612232810.f46nbqkdhbutzqdg%40alap3.anarazel.de |
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| .. | ||
| atomics | ||
| win32 | ||
| win32_msvc | ||
| aix.h | ||
| atomics.h | ||
| cygwin.h | ||
| darwin.h | ||
| freebsd.h | ||
| linux.h | ||
| netbsd.h | ||
| openbsd.h | ||
| pg_bitutils.h | ||
| pg_bswap.h | ||
| pg_cpu.h | ||
| pg_crc32c.h | ||
| pg_getopt_ctx.h | ||
| pg_iovec.h | ||
| pg_lfind.h | ||
| pg_numa.h | ||
| pg_pthread.h | ||
| simd.h | ||
| solaris.h | ||
| win32.h | ||
| win32_port.h | ||
| win32ntdll.h | ||