Mercurial > jdk8-mips64-public > hotspot / annotate
src/share/vm/Xusage.txt@e1162778c1c8 (annotated)
src/share/vm/Xusage.txt
Thu, 07 Apr 2011 09:53:20 -0700
- author
- johnc
- date
- Thu, 07 Apr 2011 09:53:20 -0700
- changeset 2781
- e1162778c1c8
- parent 0
- f90c822e73f8
- permissions
- -rw-r--r--
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
Summary: A referent object that is only weakly reachable at the start of concurrent marking but is re-attached to the strongly reachable object graph during marking may not be marked as live. This can cause the reference object to be processed prematurely and leave dangling pointers to the referent object. Implement a read barrier for the java.lang.ref.Reference::referent field by intrinsifying the Reference.get() method, and intercepting accesses though JNI, reflection, and Unsafe, so that when a non-null referent object is read it is also logged in an SATB buffer.
Reviewed-by: kvn, iveresov, never, tonyp, dholmes
| aoqi@0 | 1 | -Xmixed mixed mode execution (default) |
| aoqi@0 | 2 | -Xint interpreted mode execution only |
| aoqi@0 | 3 | -Xbootclasspath:<directories and zip/jar files separated by ;> |
| aoqi@0 | 4 | set search path for bootstrap classes and resources |
| aoqi@0 | 5 | -Xbootclasspath/a:<directories and zip/jar files separated by ;> |
| aoqi@0 | 6 | append to end of bootstrap class path |
| aoqi@0 | 7 | -Xbootclasspath/p:<directories and zip/jar files separated by ;> |
| aoqi@0 | 8 | prepend in front of bootstrap class path |
| aoqi@0 | 9 | -Xnoclassgc disable class garbage collection |
| aoqi@0 | 10 | -Xincgc enable incremental garbage collection |
| aoqi@0 | 11 | -Xloggc:<file> log GC status to a file with time stamps |
| aoqi@0 | 12 | -Xbatch disable background compilation |
| aoqi@0 | 13 | -Xms<size> set initial Java heap size |
| aoqi@0 | 14 | -Xmx<size> set maximum Java heap size |
| aoqi@0 | 15 | -Xss<size> set java thread stack size |
| aoqi@0 | 16 | -Xprof output cpu profiling data |
| aoqi@0 | 17 | -Xfuture enable strictest checks, anticipating future default |
| aoqi@0 | 18 | -Xrs reduce use of OS signals by Java/VM (see documentation) |
| aoqi@0 | 19 | -Xcheck:jni perform additional checks for JNI functions |
| aoqi@0 | 20 | -Xshare:off do not attempt to use shared class data |
| aoqi@0 | 21 | -Xshare:auto use shared class data if possible (default) |
| aoqi@0 | 22 | -Xshare:on require using shared class data, otherwise fail. |
| aoqi@0 | 23 | |
| aoqi@0 | 24 | The -X options are non-standard and subject to change without notice. |
