[Bug translator/2293] confirm preemption/interrupt blocking in systemtap probes

["hunt at redhat dot com" <sourceware-bugzilla@sourceware.org>]

------- Additional Comments From hunt at redhat dot com  2006-03-29 07:06 -------
Still trying to figure out the transport problem. It appears to not be solvable;
if you disable interrupts, stpd will not be processing any output and output
from "probe end" will get truncated if the user tries to write too much.

However, simply removing the local_irq_save() for "probe begin" and "probe end"
would still leave us vulnerable to the possibility of preemption causing the cpu
to change during the probe execution. One possibility would be to replace all
smp_processor_id() calls with _stp_processor_id() which would do

if (STAP_SESSION_STARTING or STAP_SESSION_STOPPING)
    return 0
else
    return smp_processor_id()




-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |


http://sourceware.org/bugzilla/show_bug.cgi?id=2293

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