[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-1.2-232-g473b6ce

[mark at sourceware dot org]

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- Log -----------------------------------------------------------------
commit 473b6ced23aea05af435ab6043b09c4250d34f5f
Author: Mark Wielaard <mjw@redhat.com>
Date:   Wed Jun 9 14:49:27 2010 +0200

    Set vma_cache_p->dentry before use.
    
    Bug (on old kernels) introduced by typo in commit ebf779.
    
    * runtime/task_finder.c (__stp_call_mmap_callbacks_for_task): Make sure to
      set vma_cache_p->dentry before usage.

commit 722a48dbe4ea51e798a137cb40663812126b2939
Author: Mark Wielaard <mjw@redhat.com>
Date:   Wed Jun 9 12:48:14 2010 +0200

    Add more error messages when something goes wrong during task_finder detach.
    
    * runtime/task_finder.c (stap_utrace_detach): Report when utrace_barrier
      fails.
      (stap_utrace_detach_ops): Report how stap_utrace_detach failed.

commit 74e225cc701a87a96385ab48dcda440c59013871
Author: Mark Wielaard <mjw@redhat.com>
Date:   Wed Jun 9 12:47:11 2010 +0200

    Fix task_finder.c f_dentry -> dentry typo.
    
    * runtime/task_finder.c (__stp_call_mmap_callbacks_for_task): Fix typo.

commit 9cb8092cf84d18e7435f03eef3963e01ea4e993f
Author: Mark Wielaard <mjw@redhat.com>
Date:   Wed Jun 9 11:50:48 2010 +0200

    Loop on utrace_barrier if utrace_control UTRACE_DETACH returns -EINPROGRESS.
    
    When utrace_control(tsk, eng, UTRACE_DETACH) returns -EINPROGRESS that
    means there are still handlers running. So loop on utrace_barrier(tsk, eng)
    in that case, till it no longer returns -ERESTARTSYS. That makes sure that
    no engine handler will be called afterwards, so we can safely unload the
    stap module. Not doing this might have caused PR11672
    (utrace_report_syscall_exit crash), although we don't yet have a simple
    reproducer for that issue.
    
    * runtime/itrace.c (remove_usr_itrace_info): Loop on utrace_barrier if
      utrace_control returned -EINPROGRESS.
    * runtime/task_finder.c (stap_utrace_detach): Likewise.
      (stap_utrace_detach_ops): Likewise. And warn if stap_utrace_detach
      didn't return successfully.
      (__stp_utrace_attach): Loop on -ERESTARTSYS after utrace_barrier.
      (__stp_utrace_task_finder_target_quiesce): Likewise.

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

Summary of changes:
 runtime/itrace.c      |    5 +++++
 runtime/task_finder.c |   45 ++++++++++++++++++++++++++++++++-------------
 2 files changed, 37 insertions(+), 13 deletions(-)


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systemtap: system-wide probe/trace tool