[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-1.7-188-g36de3b6

[dsmith@sourceware.org]

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- Log -----------------------------------------------------------------
commit 36de3b61c7ae68f08d72816f91e5ecddcda078fd
Author: David Smith <dsmith@redhat.com>
Date:   Fri Apr 27 15:43:16 2012 -0500

    Use new task_work kernel feature to truly stop tasks.
    
    * buildrun.cxx (compile_pass): Add STAPCONF_TASK_WORK_ADD_EXPORTED autoconf.
    * runtime/autoconf-utrace-via-ftrace.c (__autoconf_func): Makes sure
      <linux/task_work.h> is present and works.
    * runtime/autoconf-utrace-via-tracepoints.c (__autoconf_func): Ditto.
    * runtime/runtime.h: Added export kludge variables for task_work_add() and
      task_work_cancel().
    * runtime/stp_utrace.c (utrace_init): If the task_work_* functions aren't
      exported, use kallsyms_lookup_name() to find them.
      (utrace_cleanup): Cancel work function if necessary.
      (utrace_task_alloc): Initialize task work structure.
      (utrace_free): Cancel work function if necessary.
      (utrace_do_stop): Use task_work_add() functionality to replace
      set_notify_resume().
      (utrace_stop): Ditto.
      (utrace_control): Ditto.
      (finish_report): Ditto.
      (utrace_resume): Updated to work as task worker function.
    * runtime/task_finder2.c (__stp_task_worker): New function.
      (__stp_utrace_task_finder_target_quiesce): If we can't sleep, use
      task_work_add() to truly stop the task.
    * runtime/uprobes-inode.c (stapiu_change_plus): Check build-ids.

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

Summary of changes:
 buildrun.cxx                              |    3 +
 runtime/autoconf-utrace-via-ftrace.c      |    5 +
 runtime/autoconf-utrace-via-tracepoints.c |    6 ++
 runtime/runtime.h                         |    6 ++
 runtime/stp_utrace.c                      |  123 +++++++++++++++++++++++++----
 runtime/task_finder2.c                    |   71 +++++++++++++++--
 runtime/uprobes-inode.c                   |   11 +++-
 7 files changed, 201 insertions(+), 24 deletions(-)


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systemtap: system-wide probe/trace tool