[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-1.2-23-g4df79aa

[jistone at sourceware dot org]

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- Log -----------------------------------------------------------------
commit 4df79aaf86a9b6dfbccc3c51946024a30ba43726
Author: Josh Stone <jistone@redhat.com>
Date:   Tue Mar 30 14:54:39 2010 -0700

    Use a wider cache for simple function lookups
    
    When we have many individual function lookups, like the nearly 1000 with
    syscall.*, each one will iterate every CU in the module (M) and then do a
    cache lookup in N entries.  That's a thousand MlogN lookups.
    
    We can instead keep the functions in a module-wide map, and then the
    complexity is just a thousand logMN lookups.
    
    Before:
      $ ./run-stap -l 'syscall.**' --vp 01 >/dev/null
      Pass 2: analyzed script: 793 probe(s), 11 function(s), 20 embed(s),
      0 global(s) using 245872virt/147304res/78272shr kb,
      in 1390usr/60sys/1448real ms.
    
    After:
      $ ./run-stap -l 'syscall.**' --vp 01 >/dev/null
      Pass 2: analyzed script: 793 probe(s), 11 function(s), 20 embed(s),
      0 global(s) using 246228virt/147616res/78276shr kb,
      in 720usr/60sys/782real ms.
    
    * dwflpp.cxx (dwflpp::iterate_single_function): Do a simple function
      lookup based on a module-wide cache.
      (dwflpp::mod_function_caching_callback): Helper for above.
    * tapsets.cxx (dwarf_query::query_module_functions): Query a single
      function from the module-wide cache.
      (dwarf_query::query_module_dwarf): Use above for simple cases.

commit 5898b6e1087175bc85e35ba147334fe87e3d7d06
Author: Josh Stone <jistone@redhat.com>
Date:   Mon Mar 29 18:24:04 2010 -0700

    Remove unused code from iterate_over_functions
    
    * dwflpp.cxx (dwflpp::iterate_over_functions): No caller is using
      has_statement_num anymore (since 6b517475), so kill it.
    * tapsets.cxx (query_cu): Let the default call rule the day.

-----------------------------------------------------------------------

Summary of changes:
 dwflpp.cxx  |   69 +++++++++++++++++++++++++++++++++++++++++++++++++++-------
 dwflpp.h    |   14 ++++++++---
 tapsets.cxx |   61 +++++++++++++++++++++++++++++++++++++++++++++++++--
 3 files changed, 128 insertions(+), 16 deletions(-)


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