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6888526: Linux getCurrentThreadCpuTime is drastically slower than Windows

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Reviewed-by: dcubed, dholmes
This commit is contained in:
Andrew Haley 2010-07-28 17:38:21 +01:00
parent 53ac035768
commit d44a3683b1
2 changed files with 10 additions and 3 deletions
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7
hotspot/src/os/linux/vm/globals_linux.hpp
View File

@ -29,9 +29,10 @@
product(bool, UseOprofile, false, \
"enable support for Oprofile profiler") \
\
product(bool, UseLinuxPosixThreadCPUClocks, false, \
"enable fast Linux Posix clocks where available") \
product(bool, UseLinuxPosixThreadCPUClocks, true, \
"enable fast Linux Posix clocks where available")
// NB: The default value of UseLinuxPosixThreadCPUClocks may be
// overridden in Arguments::parse_each_vm_init_arg.
//
// Defines Linux-specific default values. The flags are available on all

6
hotspot/src/share/vm/runtime/arguments.cpp
View File

@ -2593,6 +2593,12 @@ SOLARIS_ONLY(
FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
}
#ifdef LINUX
if (JDK_Version::current().compare_major(6) <= 0 &&
FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
}
#endif // LINUX
return JNI_OK;
}