Now the livepatch register one tracer for each changed function.
So ftrace will iterates the whole tracers list when each changed
function be called. And when there are many changed functions, this
solution can cause performance degradation obviously.
So I think we can register only one tracer for all the changed
functions. And in this tracer handler we can find the right new function
list easily using the hash value of the old function address.
Thanks,
Chengming
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