[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-1.6-579-g5876002

[mark@sourceware.org]

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The branch, master has been updated
       via  5876002191544908925353c6ea20a0335be7e703 (commit)
       via  262f75989148e759f76f16044677182a218bf680 (commit)
       via  ab86339871ab6e281cbb3c62ea9b1d5f6a53e1f4 (commit)
      from  64e807c2d576126a24ffb251fb4108f3940ece0b (commit)

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- Log -----------------------------------------------------------------
commit 5876002191544908925353c6ea20a0335be7e703
Merge: 262f759 64e807c
Author: Mark Wielaard <mjw@redhat.com>
Date:   Mon Dec 12 15:59:28 2011 +0100

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

commit 262f75989148e759f76f16044677182a218bf680
Author: Mark Wielaard <mjw@redhat.com>
Date:   Mon Dec 12 15:54:59 2011 +0100

    Protect just the transport state with _stp_transport_mutex.
    
    _stp_transport_mutex was held over the whole of _stp_handle_start()
    and _stp_cleanup_and_exit(). This is unnecessary and dangerous since
    some functions that get called could sleep. Add a new state variable
    _stp_start_called and protect just that together with _stp_exit_called
    to make sure _stp_handle_start() and _stp_cleanup_and_exit() are only
    executed once.

commit ab86339871ab6e281cbb3c62ea9b1d5f6a53e1f4
Author: Mark Wielaard <mjw@redhat.com>
Date:   Mon Dec 12 13:46:28 2011 +0100

    uprobes.c add rcu_read_lock for pid_task(), rcu_dereference and utrace.
    
    pid_task(), rcu_dereference() and the utrace functions that convert a
    given pid to a task need to be protected by the rcu_read_lock().

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

Summary of changes:
 runtime/transport/transport.c |   50 ++++++++++++++++++++++++++++++----------
 runtime/uprobes2/uprobes.c    |   42 ++++++++++++++++++++++++++++++++--
 2 files changed, 76 insertions(+), 16 deletions(-)


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systemtap: system-wide probe/trace tool