[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-1.6-83-g5738a98

[mark@sourceware.org]

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- Log -----------------------------------------------------------------
commit 5738a9825160b4fdc76882d30578c4ae06c058f5
Author: Mark Wielaard <mjw@redhat.com>
Date:   Thu Aug 11 12:34:01 2011 +0200

    Only collect and emit unwind data in translator if the session needs it.
    
    When we hit the translator the session already knows whether or not it
    will possibly need the unwind data. Only collect and emit it, if the
    session does. This can save writing out tens of MB to stap-symbols.h
    for simple scripts that never call any backtrace() function.

commit 4310ef773dfeba9dde69f905c8718897894ca4ff
Author: Mark Wielaard <mjw@redhat.com>
Date:   Thu Aug 11 12:03:55 2011 +0200

    Remove preempt_disable from unwind hotpath.
    
    We only need to preempt_disable when we fail to find a kernel module to
    unwind through so we can call __module_text_address.

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

Summary of changes:
 runtime/unwind.c |    7 ++++---
 translate.cxx    |   13 ++++++++-----
 2 files changed, 12 insertions(+), 8 deletions(-)


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systemtap: system-wide probe/trace tool