Use MFENCE to sync RDTSC on non-Intel CPUs.
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Authored by kib on Jul 25 2017, 10:54 AM.

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Commits: rS321608: Use MFENCE to serialize RDTSC on non-Intel CPUs.

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rS FreeBSD src repository - subversion

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kib created this revision.Jul 25 2017, 10:54 AM

Herald added a subscriber: imp. · View Herald TranscriptJul 25 2017, 10:54 AM

emaste added a subscriber: emaste.Jul 25 2017, 2:24 PM

Microoptimize, make the lfence (intel) case fastest.

Closed by commit rS321608: Use MFENCE to serialize RDTSC on non-Intel CPUs. (authored by kib). · Explain WhyJul 27 2017, 8:37 AM

This revision was automatically updated to reflect the committed changes.

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head/

lib/

libc/

x86/

sys/

__vdso_gettc.c

127 lines

Diff 31248

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head/lib/libc/x86/sys/__vdso_gettc.c

Use MFENCE to sync RDTSC on non-Intel CPUs.ClosedPublicActions