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2178143: JVM crashes if the number of bound CPUs changed during runtime

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Supply a new flag -XX:+AssumeMP to workaround the problem. With the flag is turned on, assume VM run on MP platform so is_MP() will return true that sync calls will not skip away.

Reviewed-by: dholmes, acorn, dcubed, jmasa
This commit is contained in:
Yumin Qi 2013-03-27 17:03:19 -07:00 • committed by Yumin Qi
parent 0f6fd31a93
commit 76cc94fb99
3 changed files with 11 additions and 1 deletions
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7
hotspot/src/share/vm/runtime/arguments.cpp
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@ -3325,6 +3325,13 @@ jint Arguments::parse(const JavaVMInitArgs* args) {
}
check_deprecated_gcs();
check_deprecated_gc_flags();
if (AssumeMP && !UseSerialGC) {
if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
warning("If the number of processors is expected to increase from one, then"
" you should configure the number of parallel GC threads appropriately"
" using -XX:ParallelGCThreads=N");
}
}
#else // INCLUDE_ALL_GCS
assert(verify_serial_gc_flags(), "SerialGC unset");
#endif // INCLUDE_ALL_GCS