P4 Description
The proposed fix of JDK-8200613 causes an increase in the size of the corefile dumped with CDS on Linux.
The typical corefile size increase with this would include the following components at a high level:
* Any NIO file mapping with MapMode.PRIVATE.
* Any file mmap()-ed by any native library with MAP_PRIVATE.
* The read only CDS regions (ro and od): Of the order of a few MB.
* The shared strings CDS region. (typically less than 1 MB).
* 2 MB per native shared library (regions with ---p permissions
mapped by the dynamic linker for better alignment and for keeping
libraries efficiently shareable).
* The JDK 'modules' file. (About 140 MB).
To control the increase in the corefile size, the modules file is being unmapped as a part of the proposed fix forJDK-8200613.
We need to unmap the NIO file mappings with MapMode.PRIVATE too.
The typical corefile size increase with this would include the following components at a high level:
* Any NIO file mapping with MapMode.PRIVATE.
* Any file mmap()-ed by any native library with MAP_PRIVATE.
* The read only CDS regions (ro and od): Of the order of a few MB.
* The shared strings CDS region. (typically less than 1 MB).
* 2 MB per native shared library (regions with ---p permissions
mapped by the dynamic linker for better alignment and for keeping
libraries efficiently shareable).
* The JDK 'modules' file. (About 140 MB).
To control the increase in the corefile size, the modules file is being unmapped as a part of the proposed fix for
We need to unmap the NIO file mappings with MapMode.PRIVATE too.
Attachments
Issue Links
- relates to
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JDK-8200613 SA: jstack throws UnmappedAddressException with a CDS core file
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- Resolved
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