[Bug runtime/6504] New: change _stp_print_flush to avoid calling into kernel/relay.c

[fche at redhat dot com]

Following from bug #6487, we need to reduce the regions of the kernel
that are dynamically reachable from probe handlers.  For this particular
case, _stp_print_flush should avoid calling into the relay subsystem
(on modern kernels) and instead use some other mechanism to flag
available data.

I'm told lttng uses more conservative code (setting a
flag; having a separate worker/timer thread manage data copying, or
something like that).  Considering the many copies we already suffer
in sending data to userspace, this sort of thing would not be a big
hit.

-- 
           Summary: change _stp_print_flush to avoid calling into
                    kernel/relay.c
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: fche at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=6504

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