sched/membarrier: reduce the ability to hammer on sys_membarrier

On some systems, sys_membarrier can be very expensive, causing overall
slowdowns for everything.  So put a lock on the path in order to
serialize the accesses to prevent the ability for this to be called at
too high of a frequency and saturate the machine.

Signed-off-by: Greg Kroah-Hartman <[email protected]>
Reviewed-and-tested-by: Mathieu Desnoyers <[email protected]>
Acked-by: Borislav Petkov <[email protected]>
Fixes: 22e4ebb97582 ("membarrier: Provide expedited private command")
Fixes: c5f58bd58f43 ("membarrier: Provide GLOBAL_EXPEDITED command")
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions