[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-1.8-239-g44cfbe2

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- Log -----------------------------------------------------------------
commit 44cfbe258c8cdd0bf0a677e913e885a3f942cc37
Author: Serguei Makarov <smakarov@redhat.com>
Date:   Mon Sep 17 18:03:31 2012 -0400

    PR6580: incremental unwinder with cache.
    
    Implements a cached unwinder, allowing most backtrace tapset functions
    to be implemented in terms of stack() without loss of performance.
    stack() calls can be made repeatedly and in any order, and they will
    use the results of a single unwind. (Works only with the DWARF
    unwinder).
    
    _stp_stack_kernel_print et. al. retain their prior behaviour,
    including a number of fallbacks not available to the incremental
    unwind. These fallbacks only emit backtrace strings, which can be
    tokenized on the tapset end as a last resort.
    
    * runtime/unwind/unwind.h -- define struct unwind_cache to store PCs
      obtained from unwinder.
    * runtime/common_probe_context.h -- include two sets of unwinder
      context and cache, one for user side, one for kernel.
    * tapsets.cxx -- probe prologue includes a small thing to mark
      the unwind caches as being in an uninitialized state.
    * runtime/stack.c -- incremental unwinder implementation.
    * runtime/stack-dwarf.c -- deleted. Code moved to stack.c since
      this is now the preferred unwind method.
    * tapset/linux/[u]context-symbols.stp -- change stack(), ustack()
      to directly call incremental unwinder.

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

Summary of changes:
 runtime/common_probe_context.h    |    5 +-
 runtime/stack-dwarf.c             |   98 -----------
 runtime/stack.c                   |  330 ++++++++++++++++++++++++++++++++-----
 runtime/unwind/unwind.h           |   14 ++
 tapset/linux/context-symbols.stp  |   13 ++-
 tapset/linux/ucontext-symbols.stp |   13 ++-
 tapsets.cxx                       |    5 +
 7 files changed, 335 insertions(+), 143 deletions(-)
 delete mode 100644 runtime/stack-dwarf.c


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