[Bug dynamic-link/15533] New: LD_AUDIT introduces an avoidable performance degradation

[Bug dynamic-link/15533] New: LD_AUDIT introduces an avoidable performance degradation

[amonakov at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15533

            Bug ID: 15533
           Summary: LD_AUDIT introduces an avoidable performance
                    degradation
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: amonakov at gmail dot com

Created attachment 7044
  --> http://sourceware.org/bugzilla/attachment.cgi?id=7044&action=edit
testcase

Introducing an audit library currently force-enables instrumenting for
profiling in the dynamic linker (as if LD_AUDIT implied LD_PROFILE).  However,
this is not necessary if the audit library does not provide la_plt{enter,exit}
symbols.

Attached testcase demonstrates the performance hit:

$ make test
time ./main
0.47user 0.00system 0:00.48elapsed 99%CPU (0avgtext+0avgdata 1984maxresident)k
0inputs+0outputs (0major+170minor)pagefaults 0swaps
time env LD_AUDIT=./libaudit.so ./main
8.96user 0.00system 0:08.97elapsed 99%CPU (0avgtext+0avgdata 3264maxresident)k
0inputs+0outputs (0major+442minor)pagefaults 0swaps

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[Bug dynamic-link/15533] LD_AUDIT introduces an avoidable performance degradation

[amonakov at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15533

--- Comment #1 from Alexander Monakov <amonakov at gmail dot com> ---
Patch: http://sourceware.org/ml/libc-alpha/2013-05/msg00888.html

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[Bug dynamic-link/15533] LD_AUDIT introduces an avoidable performance degradation

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=15533

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Flags|                            |security-

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[Bug dynamic-link/15533] LD_AUDIT introduces an avoidable performance degradation

[nnye at whitebeamsec dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=15533

Nathan Nye <nnye at whitebeamsec dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |nnye at whitebeamsec dot com

--- Comment #2 from Nathan Nye <nnye at whitebeamsec dot com> ---
This patch causes la_symbind64 to no longer run (also I assume la_symbind32),
so the scope isn't limited to just the la_plt{enter,exit} functions.

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[Bug dynamic-link/15533] LD_AUDIT introduces an avoidable performance degradation

[adhemerval.zanella at linaro dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=15533

Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
   Target Milestone|---                         |2.35
             Status|NEW                         |RESOLVED
                 CC|                            |adhemerval.zanella at linaro dot o
                   |                            |rg

--- Comment #3 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
Fixed on 2.35 (063f9ba220f434c7f30dd65c4cff17c0c458a7cf).

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