Re: why this behavior in 3.16 kernel ?

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cool linux <linux.cool.hot@xxxxxxxxx> writes:

> Hi Eric/Andrew,
>
> Thanks for your response.
>
> I have commented out the synchronize_rcu() in namespace_unlock() which is
> located in /fs/namespace.c namespace_unlock() 
>
> now am able to see the result in fraction of seconds.

Interesting.   So it is just the fact you are serializing things in the
loop that makes things slow.

I would recommend syncrhonize_rcu_expidited but in this case since we
aren't holding a lock this is a case that looks like it will only show
up when testing (because things are needlessly serialized) and not in
the real world.

Eric
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