Re: [PATCH 1/2] rwsem: add rwsem_is_contended V3

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* Josef Bacik <jbacik@xxxxxxxxxxxx> wrote:

> Btrfs needs a simple way to know if it needs to let go of it's read lock on a
> rwsem.  Introduce rwsem_is_contended to check to see if there are any waiters on
> this rwsem currently.  This is just a hueristic, it is meant to be light and not
> 100% accurate and called by somebody already holding on to the rwsem in either
> read or write.  Thanks,
> 
> Signed-off-by: Josef Bacik <jbacik@xxxxxxxxxxxx>

Acked-by: Ingo Molnar <mingo@xxxxxxxxxx>

Thanks,

	Ingo
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