[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-1.2-67-gbd65935

[mark at sourceware dot org]

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commit bd6593518895fc613b973500c03a3b844bbe68c5
Author: Mark Wielaard <mjw@redhat.com>
Date:   Tue Apr 20 22:06:15 2010 +0200

    PR11514 Only expand kallsyms once for kprobe_derived_probe_group.
    
    kprobe_register is really expensive when used for multiple symbol
    based probes since it will call kallsyms_expand_symbol over and over
    to uncompress the kernel symbol table. So flip the comparison loop
    inside out by looping once over the kernel symbol table.
    
    * tapsets.cxx (kprobe_derived_probe_group::emit_module_decls): Declare
      kprobe_resolve helper function.
      (kprobe_derived_probe_group::emit_module_init): Call kprobe_resolve
      through kallsyms_on_each_symbol. Never register through symbol name,
      just check that address has been filled in by kprobe_resolve.

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

Summary of changes:
 tapsets.cxx |   26 ++++++++++++++++++++++----
 1 files changed, 22 insertions(+), 4 deletions(-)


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