[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-0.9.7-184-gf8f0efc

[jistone at sourceware dot org]

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- Log -----------------------------------------------------------------
commit f8f0efc149191d8d840adb5908f68c81e652d07b
Merge: c8ad068755e7424e767660f2c27cb3b1e2d5343d 209dd533fc8de83015d7e83d0426a1cb956ff9fc
Author: Josh Stone <jistone@redhat.com>
Date:   Tue Jun 2 00:53:40 2009 -0700

    Merge branch 'master' of ssh://sourceware.org/git/systemtap

commit c8ad068755e7424e767660f2c27cb3b1e2d5343d
Author: Josh Stone <jistone@redhat.com>
Date:   Tue Jun 2 00:43:49 2009 -0700

    Cache the last result of dwarf_getscopes
    
    This one function accounted for ~30% of my callgrind profile of
    "stap -l 'syscall.*'", even though it was only called ~1200 times.  We
    call dwarf_getscopes for each $target variable, with the same parameters
    within a given probe.  Since they're no nicely grouped, it's easy to
    just cache the most recent call, and the next few calls will be a hit.
    
    Overall this cuts the number of calls down to about 300, for an easy
    speed gain.

commit 276465828851648edc5b56f762a0d100051c9e32
Author: Josh Stone <jistone@redhat.com>
Date:   Mon Jun 1 18:47:30 2009 -0700

    Move the blacklist functions into dwflpp
    
    For a call like "stap -l 'syscall.*'", I found that ~10% of the time was
    spent compiling the blacklist regexps over again for each probe point.
    By moving this functionality into the kernel dwflpp instance, we can
    reuse the regexps and get an easy speed boost.

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

Summary of changes:
 dwflpp.cxx  |  313 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 dwflpp.h    |   26 +++++
 tapsets.cxx |  324 +----------------------------------------------------------
 3 files changed, 341 insertions(+), 322 deletions(-)


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systemtap: system-wide probe/trace tool