[Bug runtime/11602] New: compress unwind data

[Bug runtime/11602] New: compress unwind data

[fche at redhat dot com]

16MB of maximum module size can be exceeded if one attempts to upload
unwind/symbol data for huge userspace libraries like libxul.so.  It
turns out that .eh_frame and .debug_frame are highly compressible
(gzip shows 80%).  We could put the compressed form into the .ko
and decompress on demand into the relatively more voluminous kernel
heap.

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           Summary: compress unwind data
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: fche at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=11602

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[Bug runtime/11602] compress unwind data

[fche at redhat dot com]

------- Additional Comments From fche at redhat dot com  2010-05-19 14:11 -------
Note that we would not want to decompress the stuff until / unless the
respective stp_module is actually required (=> having section addresses
assigned by run-time detection of presence).


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http://sourceware.org/bugzilla/show_bug.cgi?id=11602

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[Bug runtime/11602] compress unwind data

[fche at redhat dot com]

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           What    |Removed                     |Added
----------------------------------------------------------------------------
OtherBugsDependingO|                            |11609
              nThis|                            |


http://sourceware.org/bugzilla/show_bug.cgi?id=11602

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[Bug runtime/11602] compress unwind data

[ajakop at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=11602

Abe Jakop <ajakop at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |ajakop at redhat dot com
         Resolution|---                         |WONTFIX

--- Comment #3 from Abe Jakop <ajakop at redhat dot com> ---
The 64MB maximum module size limit was removed in kernel 3.4. For fedoras 18+
and RHEL7+, compressing the data (or other debug_info data) is not necessary.

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[Bug runtime/11602] compress unwind data

[fche at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=11602

--- Comment #2 from Frank Ch. Eigler <fche at redhat dot com> 2011-10-19 01:00:36 UTC ---
Or it could remain specially compressed, as in
http://code.google.com/p/idzip/

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