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    • danno@chromium.org's avatar
      Fix performance regressions due to lazy initialization. · 63f03357
      danno@chromium.org authored 
      This CL:
- Adds a new trait parameter to LazyInstance to let it initialize the instance
  without paying the cost of atomic operations (which are expensive on Mac).
  This only works for users who don't care about thread-safety and this is now
the default initialization trait used by LazyInstance in v8.

- Reverts the changes that were made in r11010 in isolate.{cc,h}. That lets
  Isolate's accessors be as cheap as they were before (but adds one static initializer).

- Adds OS::PostSetup() used to initialize the math functions which depend on CPU features.
That lets the math functions get rid of CallOnce().

BUG=118686

Review URL: https://chromiumcodereview.appspot.com/9873023
Patch from Philippe Liard <pliard@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11198 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
      63f03357
  21. 12 Mar, 2012 1 commit
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  25. 07 Feb, 2012 1 commit
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  31. 17 Jan, 2012 2 commits
  33. 16 Jan, 2012 1 commit
  35. 13 Jan, 2012 1 commit
  37. 03 Nov, 2011 1 commit
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  43. 11 Jul, 2011 1 commit
  45. 05 Jul, 2011 1 commit
  47. 10 Jun, 2011 1 commit
    • mikhail.naganov@gmail.com's avatar
      "Deiceolate" Thread classes. · 508b22c4
      mikhail.naganov@gmail.com authored 
      Thread class was receiving an isolate parameter by default.
This approact violates the assumption that only VM threads
can have an associated isolate, and can lead to troubles,
because accessing the same isolate from different threads
leads to race conditions.

This was found by investigating mysterious failures of the
CPU profiler layout test on Linux Chromium. As almost all
threads were associated with some isolate, the sampler was
trying to sample them.

As a side effect, we have also fixed the DebuggerAgent test.

Thanks to Vitaly for help in fixing isolates handling!

R=vitalyr@chromium.org
BUG=none
TEST=none

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8259 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
      508b22c4
  49. 08 May, 2011 1 commit
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  67. 19 Jan, 2011 3 commits