Hello,

I looked at this sycall, as lttng makes use of it, and the last posts on this 
ML would imply that Xenomai is using "IPI" aswell.
This raises a few questions:


-          Could an linux app (like lttng), that uses the membarrier syscall 
create IRQs/IPIs that ultimately negative affect realtime threads?
Ie. should this be kernel config be recommended to be disabled for Xenomai.

-          Does the syscall do anything for running Xenomai threads 
(particularly, Lttng makes use of MEMBARRIER_CMD_PRIVATE_EXPEDITED).

Regards, Norbert
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