Use MFENCE to sync RDTSC on non-Intel CPUs.
ClosedPublic
Actions

Authored by kib on Jul 25 2017, 10:54 AM.

Tags

None

Referenced Files

	Unknown Object (File)
	Wed, Feb 18, 1:19 PM

	Unknown Object (File)
	Tue, Feb 17, 10:42 AM

	Unknown Object (File)
	Tue, Feb 10, 9:48 AM

	Unknown Object (File)
	Mon, Feb 9, 10:01 PM

	Unknown Object (File)
	Sun, Jan 25, 9:14 PM

	Unknown Object (File)
	Jan 15 2026, 10:52 AM

	Unknown Object (File)
	Dec 24 2025, 8:31 PM

	Unknown Object (File)
	Dec 23 2025, 3:49 AM

Subscribers

Details

Reviewers: None
Commits: rS321608: Use MFENCE to serialize RDTSC on non-Intel CPUs.

Diff Detail

Repository

rS FreeBSD src repository - subversion

Lint

Lint Not Applicable

Unit

Tests Not Applicable

Event Timeline

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.

Revision Contents
Changeset List

Path

Size

head/

lib/

libc/

x86/

sys/

__vdso_gettc.c

127 lines

Diff 31248

View Options

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

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