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README@569333e03a95

README

Wed, 19 Oct 2016 15:22:23 +0800

author

aoqi

date

Wed, 19 Oct 2016 15:22:23 +0800

changeset 137

569333e03a95

parent 0

f90c822e73f8

permissions

-rw-r--r--

#4659 C2: Fixed a performance bug, causing many unlock operations to go through slow path.
ObjectMonitor::owner_offset_in_bytes is a pointer to owning thread.

$ stress -c 100 -i 10
$ time java SSLEngineDeadlock
Before the patch:
real 0m29.566s
user 0m38.156s
sys 0m1.590s

After the patch:
real 0m26.213s
user 0m34.996s
sys 0m1.668s

The improvement is nearly 13%.

 README:

   This file should be located at the top of the hotspot Mercurial repository.

   See http://openjdk.java.net/ for more information about the OpenJDK.

   See ../README-builds.html for complete details on build machine requirements.

 Simple Build Instructions:

     cd make && gnumake

   The files that will be imported into the jdk build will be in the "build"

   directory.