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go / go / 6e70fddec0e1d4a43ffb450f555dde82ff313397
commit6e70fddec0e1d4a43ffb450f555dde82ff313397[log] [tgz]
authorDmitry Vyukov <dvyukov@google.com>Tue Feb 17 14:25:49 2015 +0300
committerDmitry Vyukov <dvyukov@google.com>Fri Feb 20 16:52:13 2015 +0000
tree98a56d25b0af2800f77748e67a919859faa15f12
parent5868ce3519313dfa60dbc9192bf6b701b25bd4ca [diff]
runtime: fix cputicks on x86

See the following issue for context:
https://github.com/golang/go/issues/9729#issuecomment-74648287
In short, RDTSC can produce skewed results without preceding LFENCE/MFENCE.
Information on this matter is very scrappy in the internet.
But this is what linux kernel does (see rdtsc_barrier).
It also fixes the test program on my machine.

Update #9729

Change-Id: I3c1ffbf129fdfdd388bd5b7911b392b319248e68
Reviewed-on: https://go-review.googlesource.com/5033
Reviewed-by: Ian Lance Taylor <iant@golang.org>
4 files changed
tree: 98a56d25b0af2800f77748e67a919859faa15f12
  1. api/
  2. doc/
  3. include/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
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