[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-0.9-114-g52aeb26

[jistone at sourceware dot org]

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- Log -----------------------------------------------------------------
commit 52aeb26b8d83c26e00adaf70bbf5a3a828689fb2
Author: Josh Stone <jistone@redhat.com>
Date:   Thu Mar 12 17:12:38 2009 -0700

    PR9947: move runtime cleanup out of the work queue
    
    The kernel lockdep checking found a possible deadlock if a forced rmmod
    tried to destroy _stp_work_queue at the same time that the work queue
    was unregistering tracepoints.  An unlikely scenario, but still
    possible.
    
    Now the work queue will just issue a STP_REQUEST_EXIT down to usermode,
    and usermode will echo back an STP_EXIT that triggers the actual probe
    cleanup.  This way the unregistrations are happening in exactly the same
    context as the registrations were.

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

Summary of changes:
 runtime/staprun/mainloop.c         |    8 ++++++++
 runtime/transport/control.c        |    7 ++++++-
 runtime/transport/transport.c      |   20 ++++++++++++++++----
 runtime/transport/transport_msgs.h |    8 +++++---
 4 files changed, 35 insertions(+), 8 deletions(-)


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systemtap: system-wide probe/trace tool