Features/DwarfCompressor
From FedoraProject
(Moved to FeatureReadyForFesco, ticket #866) |
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== Current status == | == Current status == | ||
* Targeted release: [[Releases/18]] | * Targeted release: [[Releases/18]] | ||
| − | * Last updated: 2012- | + | * Last updated: 2012-07-18 |
| − | * Percentage of completion: | + | * Percentage of completion: 100% |
== Detailed Description == | == Detailed Description == | ||
The dwz tool http://sourceware.org/git/?p=dwz.git;a=summary can rewrite .debug_* sections, either in binaries/shared libraries, or their *.debug split files, into equivalent, but smaller, | The dwz tool http://sourceware.org/git/?p=dwz.git;a=summary can rewrite .debug_* sections, either in binaries/shared libraries, or their *.debug split files, into equivalent, but smaller, | ||
| − | DWARF. The | + | DWARF. The tool with -m option also attempts to optimize also several *.debug files at once, by moving common .debug_* data into a single new ET_REL *.debug file and using DWARF |
| − | at once, by moving common .debug_* data into a single new ET_REL *.debug file and using DWARF extensions refer to that from the *.debug files. | + | extensions refer to that from the *.debug files. The rpm and redhat-rpm-config packages have been tweaked to invoke this tool by default during find-debuginfo.sh. |
| − | + | ||
| − | + | ||
== Benefit to Fedora == | == Benefit to Fedora == | ||
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== Documentation == | == Documentation == | ||
| − | + | http://www.dwarfstd.org/ShowIssue.php?issue=120604.1&type=open and dwz manual page. | |
== Release Notes == | == Release Notes == | ||
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| − | [[Category: | + | [[Category:FeatureAcceptedF18]] |
Latest revision as of 11:20, 18 July 2012
Contents |
[edit] DWARF Compressior
[edit] Summary
Reduce size of *.debug files in debuginfo packages in Fedora 18 using DWARF Compressor dwz.
[edit] Owner
- Name: Jakub Jelinek
- Email: jakub@redhat.com
[edit] Current status
- Targeted release: Releases/18
- Last updated: 2012-07-18
- Percentage of completion: 100%
[edit] Detailed Description
The dwz tool http://sourceware.org/git/?p=dwz.git;a=summary can rewrite .debug_* sections, either in binaries/shared libraries, or their *.debug split files, into equivalent, but smaller, DWARF. The tool with -m option also attempts to optimize also several *.debug files at once, by moving common .debug_* data into a single new ET_REL *.debug file and using DWARF extensions refer to that from the *.debug files. The rpm and redhat-rpm-config packages have been tweaked to invoke this tool by default during find-debuginfo.sh.
[edit] Benefit to Fedora
Smaller debuginfo files.
[edit] Scope
All packages should be rebuilt with the new tool as well as rpm changes hit dist-f18.
[edit] How To Test
GDB testsuite, perhaps some tool to analyze whether the non-compressed and compressed debuginfos contain equivalent info.
[edit] User Experience
Users shouldn't notice this, except that debuginfo files will be smaller, and newer DWARF consumers will be needed (gdb, valgrind, dwarves, prelink, elfutils, systemtap).
[edit] Dependencies
All packages need to be rebuilt.
[edit] Contingency Plan
Worst case we stop using the compressor.
[edit] Documentation
http://www.dwarfstd.org/ShowIssue.php?issue=120604.1&type=open and dwz manual page.
[edit] Release Notes
Fedora 18 debuginfo has been post-processed by a DWARF compressor tool to reduce size of the *.debug files.
